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select 自定义样式插件 selectize.js

【特别推荐】几款极好的 JavaScript 下拉列表插件

　　表单元素让人爱恨交加。作为网页最重要的组成部分，表单几乎无处不在，从简单的邮件订阅、登陆注册到复杂的需要多页填写的信息提交功能，表单都让开发者花费了大量的时间和精力去处理，以期实现好用又漂亮的表单功能。这篇文章分享几款很棒的 JavaScript 下拉列表功能增强插件。

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Selectize.js

Selectize 是一个基于 jQuery 的 <select> UI 控件，对于标签选择和下拉列表功能非常有用。

Selectize 的目标是通过简单而强大的 API 提供坚实可用的用户体验。

主要特色：

简洁的 API，有详细的帮助文档；
支持智能排序和多属性搜索，甚至可以使用打分函数进行排序的；
支持键盘操作，对用户使用友好；
支持同时选择和删除多个项目；
支持远程数据加载，例如 Ajax 调用；

使用示例：

单选选择

$('#select-beast').selectize({
    create: true,
    sortField: 'text'
});

多项选择

$('#select-state').selectize({
    maxItems: 3
});　

插件下载在线演示

FancySelect

FancySelect 这款插件是 Web 开发中下拉框功能的一个更好的选择。

FancySelect 使用方便，只要绑定页面上的任何 Select 元素，并调用就 .fancySelect() 就可以了。

默认情况下，FancySelect 在移动设备上使用原生的选择功能和风格。

使用示例：

<select class="basic">
    <option value="">Select something…</option>
    <option>Lorem</option>
    <option>Ipsum</option>
    <option>Dolor</option>
    <option>Sit</option>
    <option>Amet</option>
</select>
 
$('.basic').fancySelect();

插件下载在线演示

Chosen

Chosen 是最流行的 jQuery 选择功能插件，也是我最喜欢，最好用的一个！

Chosen 可以帮助你轻松构建用户友好的漂亮选择功能，可以把多选转换为基于标签的输入域。

特色功能：

用户友好的下拉选择功能，支持搜索；
基于标签的多项选择功能；
支持设置选中和无效选项；
支持修改和更新事件；

使用示例：

隐藏搜索的单选功能

$(".chosen-select").chosen({disable_search_threshold: 10});

设置多选的最大选择数

$(".chosen-select").chosen({max_selected_options: 5});

监听更新事件

$("#form_field").chosen().change( … );

手动触发更新

$("#form_field").trigger("chosen:updated");　

自定义宽度

$(".chosen-select").chosen({ "95%"});

插件下载在线演示

DropKick

DropKick 可以帮助你把已有的烦人的 <select> 列表转换为漂亮的，可定制的下拉菜单。

使用示例：

默认调用

$('.default').dropkick();

自定义更新事件

$('.change').dropkick({
  change: function (value, label) {
    alert('You picked: ' + label + ':' + value);
  }
});

自定义皮肤

$('.custom_theme').dropkick({
  theme: 'black',
  change: function (value, label) {
    $(this).dropkick('theme', value);
  }
});　

插件下载在线演示

ddSlick

这款免费、轻量的 jQuery 选择功能插件让你可以轻松创建带有图片和描述的自定义下拉菜单。

使用示例：

使用 JSON 数据

$('#demoBasic').ddslick({
    data: ddData,
     300,
    imagePosition: "left",
    selectText: "Select your favorite social network",
    onSelected: function (data) {
        console.log(data);
    }
});

获取选中项

$('#demoShowSelected').ddslick({
    data: ddData,
    selectText: "Select your favorite social network",
});
 
$('#showSelectedData').on('click', function () {
    var ddData = $('#demoShowSelected').data('ddslick');
    displaySelectedData("2: Getting Selected Dropdown Data" , ddData);
});

设置选中项

$('#demoSetSelected').ddslick({
    data: ddData,
    selectText: "Select your favorite social network"
});
 
$('#btnSetSelected').on('click', function () {
    var i = $('#setIndex').val();
    if(i >= 0 && i <5)
       $('#demoSetSelected').ddslick('select', {index: i });
    else
       $('#setIndexMsg').effect('highlight',2400);
});

插件下载在线演示

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本文链接：推荐几款很棒的 JavaScript 下拉列表功能增强插件

http://brianreavis.github.io/selectize.js/

/selectize.js/

/**
 * sifter.js
 * Copyright (c) 2013 Brian Reavis & contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this
 * file except in compliance with the License. You may obtain a copy of the License at:
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under
 * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
 * ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 *
 * @author Brian Reavis <brian@thirdroute.com>
 */

(function(root, factory) {
    if (typeof define === 'function' && define.amd) {
        define(factory);
    } else if (typeof exports === 'object') {
        module.exports = factory();
    } else {
        root.Sifter = factory();
    }
}(this, function() {

    /**
     * Textually searches arrays and hashes of objects
     * by property (or multiple properties). Designed
     * specifically for autocomplete.
     *
     * @constructor
     * @param {array|object} items
     * @param {object} items
     */
    var Sifter = function(items, settings) {
        this.items = items;
        this.settings = settings || {diacritics: true};
    };

    /**
     * Splits a search string into an array of individual
     * regexps to be used to match results.
     *
     * @param {string} query
     * @returns {array}
     */
    Sifter.prototype.tokenize = function(query) {
        query = trim(String(query || '').toLowerCase());
        if (!query || !query.length) return [];

        var i, n, regex, letter;
        var tokens = [];
        var words = query.split(/ +/);

        for (i = 0, n = words.length; i < n; i++) {
            regex = escape_regex(words[i]);
            if (this.settings.diacritics) {
                for (letter in DIACRITICS) {
                    if (DIACRITICS.hasOwnProperty(letter)) {
                        regex = regex.replace(new RegExp(letter, 'g'), DIACRITICS[letter]);
                    }
                }
            }
            tokens.push({
                string : words[i],
                regex  : new RegExp(regex, 'i')
            });
        }

        return tokens;
    };

    /**
     * Iterates over arrays and hashes.
     *
     * ```
     * this.iterator(this.items, function(item, id) {
     *    // invoked for each item
     * });
     * ```
     *
     * @param {array|object} object
     */
    Sifter.prototype.iterator = function(object, callback) {
        var iterator;
        if (is_array(object)) {
            iterator = Array.prototype.forEach || function(callback) {
                for (var i = 0, n = this.length; i < n; i++) {
                    callback(this[i], i, this);
                }
            };
        } else {
            iterator = function(callback) {
                for (var key in this) {
                    if (this.hasOwnProperty(key)) {
                        callback(this[key], key, this);
                    }
                }
            };
        }

        iterator.apply(object, [callback]);
    };

    /**
     * Returns a function to be used to score individual results.
     *
     * Good matches will have a higher score than poor matches.
     * If an item is not a match, 0 will be returned by the function.
     *
     * @param {object|string} search
     * @param {object} options (optional)
     * @returns {function}
     */
    Sifter.prototype.getScoreFunction = function(search, options) {
        var self, fields, tokens, token_count;

        self        = this;
        search      = self.prepareSearch(search, options);
        tokens      = search.tokens;
        fields      = search.options.fields;
        token_count = tokens.length;

        /**
         * Calculates how close of a match the
         * given value is against a search token.
         *
         * @param {mixed} value
         * @param {object} token
         * @return {number}
         */
        var scoreValue = function(value, token) {
            var score, pos;

            if (!value) return 0;
            value = String(value || '');
            pos = value.search(token.regex);
            if (pos === -1) return 0;
            score = token.string.length / value.length;
            if (pos === 0) score += 0.5;
            return score;
        };

        /**
         * Calculates the score of an object
         * against the search query.
         *
         * @param {object} token
         * @param {object} data
         * @return {number}
         */
        var scoreObject = (function() {
            var field_count = fields.length;
            if (!field_count) {
                return function() { return 0; };
            }
            if (field_count === 1) {
                return function(token, data) {
                    return scoreValue(data[fields[0]], token);
                };
            }
            return function(token, data) {
                for (var i = 0, sum = 0; i < field_count; i++) {
                    sum += scoreValue(data[fields[i]], token);
                }
                return sum / field_count;
            };
        })();

        if (!token_count) {
            return function() { return 0; };
        }
        if (token_count === 1) {
            return function(data) {
                return scoreObject(tokens[0], data);
            };
        }

        if (search.options.conjunction === 'and') {
            return function(data) {
                var score;
                for (var i = 0, sum = 0; i < token_count; i++) {
                    score = scoreObject(tokens[i], data);
                    if (score <= 0) return 0;
                    sum += score;
                }
                return sum / token_count;
            };
        } else {
            return function(data) {
                for (var i = 0, sum = 0; i < token_count; i++) {
                    sum += scoreObject(tokens[i], data);
                }
                return sum / token_count;
            };
        }
    };

    /**
     * Returns a function that can be used to compare two
     * results, for sorting purposes. If no sorting should
     * be performed, `null` will be returned.
     *
     * @param {string|object} search
     * @param {object} options
     * @return function(a,b)
     */
    Sifter.prototype.getSortFunction = function(search, options) {
        var i, n, self, field, fields, fields_count, multiplier, multipliers, get_field, implicit_score, sort;

        self   = this;
        search = self.prepareSearch(search, options);
        sort   = (!search.query && options.sort_empty) || options.sort;

        /**
         * Fetches the specified sort field value
         * from a search result item.
         *
         * @param  {string} name
         * @param  {object} result
         * @return {mixed}
         */
        get_field  = function(name, result) {
            if (name === '$score') return result.score;
            return self.items[result.id][name];
        };

        // parse options
        fields = [];
        if (sort) {
            for (i = 0, n = sort.length; i < n; i++) {
                if (search.query || sort[i].field !== '$score') {
                    fields.push(sort[i]);
                }
            }
        }

        // the "$score" field is implied to be the primary
        // sort field, unless it's manually specified
        if (search.query) {
            implicit_score = true;
            for (i = 0, n = fields.length; i < n; i++) {
                if (fields[i].field === '$score') {
                    implicit_score = false;
                    break;
                }
            }
            if (implicit_score) {
                fields.unshift({field: '$score', direction: 'desc'});
            }
        } else {
            for (i = 0, n = fields.length; i < n; i++) {
                if (fields[i].field === '$score') {
                    fields.splice(i, 1);
                    break;
                }
            }
        }

        multipliers = [];
        for (i = 0, n = fields.length; i < n; i++) {
            multipliers.push(fields[i].direction === 'desc' ? -1 : 1);
        }

        // build function
        fields_count = fields.length;
        if (!fields_count) {
            return null;
        } else if (fields_count === 1) {
            field = fields[0].field;
            multiplier = multipliers[0];
            return function(a, b) {
                return multiplier * cmp(
                    get_field(field, a),
                    get_field(field, b)
                );
            };
        } else {
            return function(a, b) {
                var i, result, a_value, b_value, field;
                for (i = 0; i < fields_count; i++) {
                    field = fields[i].field;
                    result = multipliers[i] * cmp(
                        get_field(field, a),
                        get_field(field, b)
                    );
                    if (result) return result;
                }
                return 0;
            };
        }
    };

    /**
     * Parses a search query and returns an object
     * with tokens and fields ready to be populated
     * with results.
     *
     * @param {string} query
     * @param {object} options
     * @returns {object}
     */
    Sifter.prototype.prepareSearch = function(query, options) {
        if (typeof query === 'object') return query;

        options = extend({}, options);

        var option_fields     = options.fields;
        var option_sort       = options.sort;
        var option_sort_empty = options.sort_empty;

        if (option_fields && !is_array(option_fields)) options.fields = [option_fields];
        if (option_sort && !is_array(option_sort)) options.sort = [option_sort];
        if (option_sort_empty && !is_array(option_sort_empty)) options.sort_empty = [option_sort_empty];

        return {
            options : options,
            query   : String(query || '').toLowerCase(),
            tokens  : this.tokenize(query),
            total   : 0,
            items   : []
        };
    };

    /**
     * Searches through all items and returns a sorted array of matches.
     *
     * The `options` parameter can contain:
     *
     *   - fields {string|array}
     *   - sort {array}
     *   - score {function}
     *   - filter {bool}
     *   - limit {integer}
     *
     * Returns an object containing:
     *
     *   - options {object}
     *   - query {string}
     *   - tokens {array}
     *   - total {int}
     *   - items {array}
     *
     * @param {string} query
     * @param {object} options
     * @returns {object}
     */
    Sifter.prototype.search = function(query, options) {
        var self = this, value, score, search, calculateScore;
        var fn_sort;
        var fn_score;

        search  = this.prepareSearch(query, options);
        options = search.options;
        query   = search.query;

        // generate result scoring function
        fn_score = options.score || self.getScoreFunction(search);

        // perform search and sort
        if (query.length) {
            self.iterator(self.items, function(item, id) {
                score = fn_score(item);
                if (options.filter === false || score > 0) {
                    search.items.push({'score': score, 'id': id});
                }
            });
        } else {
            self.iterator(self.items, function(item, id) {
                search.items.push({'score': 1, 'id': id});
            });
        }

        fn_sort = self.getSortFunction(search, options);
        if (fn_sort) search.items.sort(fn_sort);

        // apply limits
        search.total = search.items.length;
        if (typeof options.limit === 'number') {
            search.items = search.items.slice(0, options.limit);
        }

        return search;
    };

    // utilities
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    var cmp = function(a, b) {
        if (typeof a === 'number' && typeof b === 'number') {
            return a > b ? 1 : (a < b ? -1 : 0);
        }
        a = String(a || '').toLowerCase();
        b = String(b || '').toLowerCase();
        if (a > b) return 1;
        if (b > a) return -1;
        return 0;
    };

    var extend = function(a, b) {
        var i, n, k, object;
        for (i = 1, n = arguments.length; i < n; i++) {
            object = arguments[i];
            if (!object) continue;
            for (k in object) {
                if (object.hasOwnProperty(k)) {
                    a[k] = object[k];
                }
            }
        }
        return a;
    };

    var trim = function(str) {
        return (str + '').replace(/^s+|s+$|/g, '');
    };

    var escape_regex = function(str) {
        return (str + '').replace(/([.?*+^$[]\(){}|-])/g, '\$1');
    };

    var is_array = Array.isArray || ($ && $.isArray) || function(object) {
        return Object.prototype.toString.call(object) === '[object Array]';
    };

    var DIACRITICS = {
        'a': '[aÀÁÂÃÄÅàáâãäå]',
        'c': '[cÇçćĆčČ]',
        'd': '[dđĐ]',
        'e': '[eÈÉÊËèéêë]',
        'i': '[iÌÍÎÏìíîï]',
        'n': '[nÑñ]',
        'o': '[oÒÓÔÕÕÖØòóôõöø]',
        's': '[sŠš]',
        'u': '[uÙÚÛÜùúûü]',
        'y': '[yŸÿý]',
        'z': '[zŽž]'
    };

    // export
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    return Sifter;
}));



/**
 * microplugin.js
 * Copyright (c) 2013 Brian Reavis & contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this
 * file except in compliance with the License. You may obtain a copy of the License at:
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under
 * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
 * ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 *
 * @author Brian Reavis <brian@thirdroute.com>
 */

(function(root, factory) {
    if (typeof define === 'function' && define.amd) {
        define(factory);
    } else if (typeof exports === 'object') {
        module.exports = factory();
    } else {
        root.MicroPlugin = factory();
    }
}(this, function() {
    var MicroPlugin = {};

    MicroPlugin.mixin = function(Interface) {
        Interface.plugins = {};

        /**
         * Initializes the listed plugins (with options).
         * Acceptable formats:
         *
         * List (without options):
         *   ['a', 'b', 'c']
         *
         * List (with options):
         *   [{'name': 'a', options: {}}, {'name': 'b', options: {}}]
         *
         * Hash (with options):
         *   {'a': { ... }, 'b': { ... }, 'c': { ... }}
         *
         * @param {mixed} plugins
         */
        Interface.prototype.initializePlugins = function(plugins) {
            var i, n, key;
            var self  = this;
            var queue = [];

            self.plugins = {
                names     : [],
                settings  : {},
                requested : {},
                loaded    : {}
            };

            if (utils.isArray(plugins)) {
                for (i = 0, n = plugins.length; i < n; i++) {
                    if (typeof plugins[i] === 'string') {
                        queue.push(plugins[i]);
                    } else {
                        self.plugins.settings[plugins[i].name] = plugins[i].options;
                        queue.push(plugins[i].name);
                    }
                }
            } else if (plugins) {
                for (key in plugins) {
                    if (plugins.hasOwnProperty(key)) {
                        self.plugins.settings[key] = plugins[key];
                        queue.push(key);
                    }
                }
            }

            while (queue.length) {
                self.require(queue.shift());
            }
        };

        Interface.prototype.loadPlugin = function(name) {
            var self    = this;
            var plugins = self.plugins;
            var plugin  = Interface.plugins[name];

            if (!Interface.plugins.hasOwnProperty(name)) {
                throw new Error('Unable to find "' +  name + '" plugin');
            }

            plugins.requested[name] = true;
            plugins.loaded[name] = plugin.fn.apply(self, [self.plugins.settings[name] || {}]);
            plugins.names.push(name);
        };

        /**
         * Initializes a plugin.
         *
         * @param {string} name
         */
        Interface.prototype.require = function(name) {
            var self = this;
            var plugins = self.plugins;

            if (!self.plugins.loaded.hasOwnProperty(name)) {
                if (plugins.requested[name]) {
                    throw new Error('Plugin has circular dependency ("' + name + '")');
                }
                self.loadPlugin(name);
            }

            return plugins.loaded[name];
        };

        /**
         * Registers a plugin.
         *
         * @param {string} name
         * @param {function} fn
         */
        Interface.define = function(name, fn) {
            Interface.plugins[name] = {
                'name' : name,
                'fn'   : fn
            };
        };
    };

    var utils = {
        isArray: Array.isArray || function(vArg) {
            return Object.prototype.toString.call(vArg) === '[object Array]';
        }
    };

    return MicroPlugin;
}));

/**
 * selectize.js (v0.8.2)
 * Copyright (c) 2013 Brian Reavis & contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this
 * file except in compliance with the License. You may obtain a copy of the License at:
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under
 * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
 * ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 *
 * @author Brian Reavis <brian@thirdroute.com>
 */

/*jshint curly:false */
/*jshint browser:true */

(function(root, factory) {
    if (typeof define === 'function' && define.amd) {
        define(['jquery','sifter','microplugin'], factory);
    } else {
        root.Selectize = factory(root.jQuery, root.Sifter, root.MicroPlugin);
    }
}(this, function($, Sifter, MicroPlugin) {
    'use strict';

    var highlight = function($element, pattern) {
        if (typeof pattern === 'string' && !pattern.length) return;
        var regex = (typeof pattern === 'string') ? new RegExp(pattern, 'i') : pattern;
    
        var highlight = function(node) {
            var skip = 0;
            if (node.nodeType === 3) {
                var pos = node.data.search(regex);
                if (pos >= 0 && node.data.length > 0) {
                    var match = node.data.match(regex);
                    var spannode = document.createElement('span');
                    spannode.className = 'highlight';
                    var middlebit = node.splitText(pos);
                    var endbit = middlebit.splitText(match[0].length);
                    var middleclone = middlebit.cloneNode(true);
                    spannode.appendChild(middleclone);
                    middlebit.parentNode.replaceChild(spannode, middlebit);
                    skip = 1;
                }
            } else if (node.nodeType === 1 && node.childNodes && !/(script|style)/i.test(node.tagName)) {
                for (var i = 0; i < node.childNodes.length; ++i) {
                    i += highlight(node.childNodes[i]);
                }
            }
            return skip;
        };
    
        return $element.each(function() {
            highlight(this);
        });
    };
    
    var MicroEvent = function() {};
    MicroEvent.prototype = {
        on: function(event, fct){
            this._events = this._events || {};
            this._events[event] = this._events[event] || [];
            this._events[event].push(fct);
        },
        off: function(event, fct){
            var n = arguments.length;
            if (n === 0) return delete this._events;
            if (n === 1) return delete this._events[event];
    
            this._events = this._events || {};
            if (event in this._events === false) return;
            this._events[event].splice(this._events[event].indexOf(fct), 1);
        },
        trigger: function(event /* , args... */){
            this._events = this._events || {};
            if (event in this._events === false) return;
            for (var i = 0; i < this._events[event].length; i++){
                this._events[event][i].apply(this, Array.prototype.slice.call(arguments, 1));
            }
        }
    };
    
    /**
     * Mixin will delegate all MicroEvent.js function in the destination object.
     *
     * - MicroEvent.mixin(Foobar) will make Foobar able to use MicroEvent
     *
     * @param {object} the object which will support MicroEvent
     */
    MicroEvent.mixin = function(destObject){
        var props = ['on', 'off', 'trigger'];
        for (var i = 0; i < props.length; i++){
            destObject.prototype[props[i]] = MicroEvent.prototype[props[i]];
        }
    };
    
    var IS_MAC        = /Mac/.test(navigator.userAgent);
    
    var KEY_A         = 65;
    var KEY_COMMA     = 188;
    var KEY_RETURN    = 13;
    var KEY_ESC       = 27;
    var KEY_LEFT      = 37;
    var KEY_UP        = 38;
    var KEY_RIGHT     = 39;
    var KEY_DOWN      = 40;
    var KEY_BACKSPACE = 8;
    var KEY_DELETE    = 46;
    var KEY_SHIFT     = 16;
    var KEY_CMD       = IS_MAC ? 91 : 17;
    var KEY_CTRL      = IS_MAC ? 18 : 17;
    var KEY_TAB       = 9;
    
    var TAG_SELECT    = 1;
    var TAG_INPUT     = 2;
    
    var isset = function(object) {
        return typeof object !== 'undefined';
    };
    
    /**
     * Converts a scalar to its best string representation
     * for hash keys and HTML attribute values.
     *
     * Transformations:
     *   'str'     -> 'str'
     *   null      -> ''
     *   undefined -> ''
     *   true      -> '1'
     *   false     -> '0'
     *   0         -> '0'
     *   1         -> '1'
     *
     * @param {string} value
     * @returns {string}
     */
    var hash_key = function(value) {
        if (typeof value === 'undefined' || value === null) return '';
        if (typeof value === 'boolean') return value ? '1' : '0';
        return value + '';
    };
    
    /**
     * Escapes a string for use within HTML.
     *
     * @param {string} str
     * @returns {string}
     */
    var escape_html = function(str) {
        return (str + '')
            .replace(/&/g, '&amp;')
            .replace(/</g, '&lt;')
            .replace(/>/g, '&gt;')
            .replace(/"/g, '&quot;');
    };
    
    /**
     * Escapes "$" characters in replacement strings.
     *
     * @param {string} str
     * @returns {string}
     */
    var escape_replace = function(str) {
        return (str + '').replace(/$/g, '$$$$');
    };
    
    var hook = {};
    
    /**
     * Wraps `method` on `self` so that `fn`
     * is invoked before the original method.
     *
     * @param {object} self
     * @param {string} method
     * @param {function} fn
     */
    hook.before = function(self, method, fn) {
        var original = self[method];
        self[method] = function() {
            fn.apply(self, arguments);
            return original.apply(self, arguments);
        };
    };
    
    /**
     * Wraps `method` on `self` so that `fn`
     * is invoked after the original method.
     *
     * @param {object} self
     * @param {string} method
     * @param {function} fn
     */
    hook.after = function(self, method, fn) {
        var original = self[method];
        self[method] = function() {
            var result = original.apply(self, arguments);
            fn.apply(self, arguments);
            return result;
        };
    };
    
    /**
     * Builds a hash table out of an array of
     * objects, using the specified `key` within
     * each object.
     *
     * @param {string} key
     * @param {mixed} objects
     */
    var build_hash_table = function(key, objects) {
        if (!$.isArray(objects)) return objects;
        var i, n, table = {};
        for (i = 0, n = objects.length; i < n; i++) {
            if (objects[i].hasOwnProperty(key)) {
                table[objects[i][key]] = objects[i];
            }
        }
        return table;
    };
    
    /**
     * Wraps `fn` so that it can only be invoked once.
     *
     * @param {function} fn
     * @returns {function}
     */
    var once = function(fn) {
        var called = false;
        return function() {
            if (called) return;
            called = true;
            fn.apply(this, arguments);
        };
    };
    
    /**
     * Wraps `fn` so that it can only be called once
     * every `delay` milliseconds (invoked on the falling edge).
     *
     * @param {function} fn
     * @param {int} delay
     * @returns {function}
     */
    var debounce = function(fn, delay) {
        var timeout;
        return function() {
            var self = this;
            var args = arguments;
            window.clearTimeout(timeout);
            timeout = window.setTimeout(function() {
                fn.apply(self, args);
            }, delay);
        };
    };
    
    /**
     * Debounce all fired events types listed in `types`
     * while executing the provided `fn`.
     *
     * @param {object} self
     * @param {array} types
     * @param {function} fn
     */
    var debounce_events = function(self, types, fn) {
        var type;
        var trigger = self.trigger;
        var event_args = {};
    
        // override trigger method
        self.trigger = function() {
            var type = arguments[0];
            if (types.indexOf(type) !== -1) {
                event_args[type] = arguments;
            } else {
                return trigger.apply(self, arguments);
            }
        };
    
        // invoke provided function
        fn.apply(self, []);
        self.trigger = trigger;
    
        // trigger queued events
        for (type in event_args) {
            if (event_args.hasOwnProperty(type)) {
                trigger.apply(self, event_args[type]);
            }
        }
    };
    
    /**
     * A workaround for http://bugs.jquery.com/ticket/6696
     *
     * @param {object} $parent - Parent element to listen on.
     * @param {string} event - Event name.
     * @param {string} selector - Descendant selector to filter by.
     * @param {function} fn - Event handler.
     */
    var watchChildEvent = function($parent, event, selector, fn) {
        $parent.on(event, selector, function(e) {
            var child = e.target;
            while (child && child.parentNode !== $parent[0]) {
                child = child.parentNode;
            }
            e.currentTarget = child;
            return fn.apply(this, [e]);
        });
    };
    
    /**
     * Determines the current selection within a text input control.
     * Returns an object containing:
     *   - start
     *   - length
     *
     * @param {object} input
     * @returns {object}
     */
    var getSelection = function(input) {
        var result = {};
        if ('selectionStart' in input) {
            result.start = input.selectionStart;
            result.length = input.selectionEnd - result.start;
        } else if (document.selection) {
            input.focus();
            var sel = document.selection.createRange();
            var selLen = document.selection.createRange().text.length;
            sel.moveStart('character', -input.value.length);
            result.start = sel.text.length - selLen;
            result.length = selLen;
        }
        return result;
    };
    
    /**
     * Copies CSS properties from one element to another.
     *
     * @param {object} $from
     * @param {object} $to
     * @param {array} properties
     */
    var transferStyles = function($from, $to, properties) {
        var i, n, styles = {};
        if (properties) {
            for (i = 0, n = properties.length; i < n; i++) {
                styles[properties[i]] = $from.css(properties[i]);
            }
        } else {
            styles = $from.css();
        }
        $to.css(styles);
    };
    
    /**
     * Measures the width of a string within a
     * parent element (in pixels).
     *
     * @param {string} str
     * @param {object} $parent
     * @returns {int}
     */
    var measureString = function(str, $parent) {
        var $test = $('<test>').css({
            position: 'absolute',
            top: -99999,
            left: -99999,
             'auto',
            padding: 0,
            whiteSpace: 'pre'
        }).text(str).appendTo('body');
    
        transferStyles($parent, $test, [
            'letterSpacing',
            'fontSize',
            'fontFamily',
            'fontWeight',
            'textTransform'
        ]);
    
        var width = $test.width();
        $test.remove();
    
        return width;
    };
    
    /**
     * Sets up an input to grow horizontally as the user
     * types. If the value is changed manually, you can
     * trigger the "update" handler to resize:
     *
     * $input.trigger('update');
     *
     * @param {object} $input
     */
    var autoGrow = function($input) {
        var update = function(e) {
            var value, keyCode, printable, placeholder, width;
            var shift, character, selection;
            e = e || window.event || {};
    
            if (e.metaKey || e.altKey) return;
            if ($input.data('grow') === false) return;
    
            value = $input.val();
            if (e.type && e.type.toLowerCase() === 'keydown') {
                keyCode = e.keyCode;
                printable = (
                    (keyCode >= 97 && keyCode <= 122) || // a-z
                    (keyCode >= 65 && keyCode <= 90)  || // A-Z
                    (keyCode >= 48 && keyCode <= 57)  || // 0-9
                    keyCode === 32 // space
                );
    
                if (keyCode === KEY_DELETE || keyCode === KEY_BACKSPACE) {
                    selection = getSelection($input[0]);
                    if (selection.length) {
                        value = value.substring(0, selection.start) + value.substring(selection.start + selection.length);
                    } else if (keyCode === KEY_BACKSPACE && selection.start) {
                        value = value.substring(0, selection.start - 1) + value.substring(selection.start + 1);
                    } else if (keyCode === KEY_DELETE && typeof selection.start !== 'undefined') {
                        value = value.substring(0, selection.start) + value.substring(selection.start + 1);
                    }
                } else if (printable) {
                    shift = e.shiftKey;
                    character = String.fromCharCode(e.keyCode);
                    if (shift) character = character.toUpperCase();
                    else character = character.toLowerCase();
                    value += character;
                }
            }
    
            placeholder = $input.attr('placeholder') || '';
            if (!value.length && placeholder.length) {
                value = placeholder;
            }
    
            width = measureString(value, $input) + 4;
            if (width !== $input.width()) {
                $input.width(width);
                $input.triggerHandler('resize');
            }
        };
    
        $input.on('keydown keyup update blur', update);
        update();
    };
    
    var Selectize = function($input, settings) {
        var key, i, n, dir, input, self = this;
        input = $input[0];
        input.selectize = self;
    
        // detect rtl environment
        dir = window.getComputedStyle ? window.getComputedStyle(input, null).getPropertyValue('direction') : input.currentStyle && input.currentStyle.direction;
        dir = dir || $input.parents('[dir]:first').attr('dir') || '';
    
        // setup default state
        $.extend(self, {
            settings         : settings,
            $input           : $input,
            tagType          : input.tagName.toLowerCase() === 'select' ? TAG_SELECT : TAG_INPUT,
            rtl              : /rtl/i.test(dir),
    
            eventNS          : '.selectize' + (++Selectize.count),
            highlightedValue : null,
            isOpen           : false,
            isDisabled       : false,
            isRequired       : $input.is('[required]'),
            isInvalid        : false,
            isLocked         : false,
            isFocused        : false,
            isInputHidden    : false,
            isSetup          : false,
            isShiftDown      : false,
            isCmdDown        : false,
            isCtrlDown       : false,
            ignoreFocus      : false,
            ignoreHover      : false,
            hasOptions       : false,
            currentResults   : null,
            lastValue        : '',
            caretPos         : 0,
            loading          : 0,
            loadedSearches   : {},
    
            $activeOption    : null,
            $activeItems     : [],
    
            optgroups        : {},
            options          : {},
            userOptions      : {},
            items            : [],
            renderCache      : {},
            onSearchChange   : debounce(self.onSearchChange, settings.loadThrottle)
        });
    
        // search system
        self.sifter = new Sifter(this.options, {diacritics: settings.diacritics});
    
        // build options table
        $.extend(self.options, build_hash_table(settings.valueField, settings.options));
        delete self.settings.options;
    
        // build optgroup table
        $.extend(self.optgroups, build_hash_table(settings.optgroupValueField, settings.optgroups));
        delete self.settings.optgroups;
    
        // option-dependent defaults
        self.settings.mode = self.settings.mode || (self.settings.maxItems === 1 ? 'single' : 'multi');
        if (typeof self.settings.hideSelected !== 'boolean') {
            self.settings.hideSelected = self.settings.mode === 'multi';
        }
    
        self.initializePlugins(self.settings.plugins);
        self.setupCallbacks();
        self.setupTemplates();
        self.setup();
    };
    
    // mixins
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    
    MicroEvent.mixin(Selectize);
    MicroPlugin.mixin(Selectize);
    
    // methods
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    
    $.extend(Selectize.prototype, {
    
        /**
         * Creates all elements and sets up event bindings.
         */
        setup: function() {
            var self      = this;
            var settings  = self.settings;
            var eventNS   = self.eventNS;
            var $window   = $(window);
            var $document = $(document);
    
            var $wrapper;
            var $control;
            var $control_input;
            var $dropdown;
            var $dropdown_content;
            var $dropdown_parent;
            var inputMode;
            var timeout_blur;
            var timeout_focus;
            var tab_index;
            var classes;
            var classes_plugins;
    
            inputMode         = self.settings.mode;
            tab_index         = self.$input.attr('tabindex') || '';
            classes           = self.$input.attr('class') || '';
    
            $wrapper          = $('<div>').addClass(settings.wrapperClass).addClass(classes).addClass(inputMode);
            $control          = $('<div>').addClass(settings.inputClass).addClass('items').appendTo($wrapper);
            $control_input    = $('<input type="text" autocomplete="off">').appendTo($control).attr('tabindex', tab_index);
            $dropdown_parent  = $(settings.dropdownParent || $wrapper);
            $dropdown         = $('<div>').addClass(settings.dropdownClass).addClass(classes).addClass(inputMode).hide().appendTo($dropdown_parent);
            $dropdown_content = $('<div>').addClass(settings.dropdownContentClass).appendTo($dropdown);
    
            $wrapper.css({
                 self.$input[0].style.width
            });
    
            if (self.plugins.names.length) {
                classes_plugins = 'plugin-' + self.plugins.names.join(' plugin-');
                $wrapper.addClass(classes_plugins);
                $dropdown.addClass(classes_plugins);
            }
    
            if ((settings.maxItems === null || settings.maxItems > 1) && self.tagType === TAG_SELECT) {
                self.$input.attr('multiple', 'multiple');
            }
    
            if (self.settings.placeholder) {
                $control_input.attr('placeholder', settings.placeholder);
            }
    
            self.$wrapper          = $wrapper;
            self.$control          = $control;
            self.$control_input    = $control_input;
            self.$dropdown         = $dropdown;
            self.$dropdown_content = $dropdown_content;
    
            $dropdown.on('mouseenter', '[data-selectable]', function() { return self.onOptionHover.apply(self, arguments); });
            $dropdown.on('mousedown', '[data-selectable]', function() { return self.onOptionSelect.apply(self, arguments); });
            watchChildEvent($control, 'mousedown', '*:not(input)', function() { return self.onItemSelect.apply(self, arguments); });
            autoGrow($control_input);
    
            $control.on({
                mousedown : function() { return self.onMouseDown.apply(self, arguments); },
                click     : function() { return self.onClick.apply(self, arguments); }
            });
    
            $control_input.on({
                mousedown : function(e) { e.stopPropagation(); },
                keydown   : function() { return self.onKeyDown.apply(self, arguments); },
                keyup     : function() { return self.onKeyUp.apply(self, arguments); },
                keypress  : function() { return self.onKeyPress.apply(self, arguments); },
                resize    : function() { self.positionDropdown.apply(self, []); },
                blur      : function() { return self.onBlur.apply(self, arguments); },
                focus     : function() { return self.onFocus.apply(self, arguments); }
            });
    
            $document.on('keydown' + eventNS, function(e) {
                self.isCmdDown = e[IS_MAC ? 'metaKey' : 'ctrlKey'];
                self.isCtrlDown = e[IS_MAC ? 'altKey' : 'ctrlKey'];
                self.isShiftDown = e.shiftKey;
            });
    
            $document.on('keyup' + eventNS, function(e) {
                if (e.keyCode === KEY_CTRL) self.isCtrlDown = false;
                if (e.keyCode === KEY_SHIFT) self.isShiftDown = false;
                if (e.keyCode === KEY_CMD) self.isCmdDown = false;
            });
    
            $document.on('mousedown' + eventNS, function(e) {
                if (self.isFocused) {
                    // prevent events on the dropdown scrollbar from causing the control to blur
                    if (e.target === self.$dropdown[0] || e.target.parentNode === self.$dropdown[0]) {
                        return false;
                    }
                    // blur on click outside
                    if (!self.$control.has(e.target).length && e.target !== self.$control[0]) {
                        self.blur();
                    }
                }
            });
    
            $window.on(['scroll' + eventNS, 'resize' + eventNS].join(' '), function() {
                if (self.isOpen) {
                    self.positionDropdown.apply(self, arguments);
                }
            });
            $window.on('mousemove' + eventNS, function() {
                self.ignoreHover = false;
            });
    
            // store original children and tab index so that they can be
            // restored when the destroy() method is called.
            this.revertSettings = {
                $children : self.$input.children().detach(),
                tabindex  : self.$input.attr('tabindex')
            };
    
            self.$input.attr('tabindex', -1).hide().after(self.$wrapper);
    
            if ($.isArray(settings.items)) {
                self.setValue(settings.items);
                delete settings.items;
            }
    
            // feature detect for the validation API
            if (self.$input[0].validity) {
                self.$input.on('invalid' + eventNS, function(e) {
                    e.preventDefault();
                    self.isInvalid = true;
                    self.refreshState();
                });
            }
    
            self.updateOriginalInput();
            self.refreshItems();
            self.refreshState();
            self.updatePlaceholder();
            self.isSetup = true;
    
            if (self.$input.is(':disabled')) {
                self.disable();
            }
    
            self.on('change', this.onChange);
            self.trigger('initialize');
    
            // preload options
            if (settings.preload) {
                self.onSearchChange('');
            }
        },
    
        /**
         * Sets up default rendering functions.
         */
        setupTemplates: function() {
            var self = this;
            var field_label = self.settings.labelField;
            var field_optgroup = self.settings.optgroupLabelField;
    
            var templates = {
                'optgroup': function(data) {
                    return '<div class="optgroup">' + data.html + '</div>';
                },
                'optgroup_header': function(data, escape) {
                    return '<div class="optgroup-header">' + escape(data[field_optgroup]) + '</div>';
                },
                'option': function(data, escape) {
                    return '<div class="option">' + escape(data[field_label]) + '</div>';
                },
                'item': function(data, escape) {
                    return '<div class="item">' + escape(data[field_label]) + '</div>';
                },
                'option_create': function(data, escape) {
                    return '<div class="create">Add <strong>' + escape(data.input) + '</strong>&hellip;</div>';
                }
            };
    
            self.settings.render = $.extend({}, templates, self.settings.render);
        },
    
        /**
         * Maps fired events to callbacks provided
         * in the settings used when creating the control.
         */
        setupCallbacks: function() {
            var key, fn, callbacks = {
                'initialize'     : 'onInitialize',
                'change'         : 'onChange',
                'item_add'       : 'onItemAdd',
                'item_remove'    : 'onItemRemove',
                'clear'          : 'onClear',
                'option_add'     : 'onOptionAdd',
                'option_remove'  : 'onOptionRemove',
                'option_clear'   : 'onOptionClear',
                'dropdown_open'  : 'onDropdownOpen',
                'dropdown_close' : 'onDropdownClose',
                'type'           : 'onType'
            };
    
            for (key in callbacks) {
                if (callbacks.hasOwnProperty(key)) {
                    fn = this.settings[callbacks[key]];
                    if (fn) this.on(key, fn);
                }
            }
        },
    
        /**
         * Triggered when the main control element
         * has a click event.
         *
         * @param {object} e
         * @return {boolean}
         */
        onClick: function(e) {
            var self = this;
    
            // necessary for mobile webkit devices (manual focus triggering
            // is ignored unless invoked within a click event)
            if (!self.isFocused) {
                self.focus();
                e.preventDefault();
            }
        },
    
        /**
         * Triggered when the main control element
         * has a mouse down event.
         *
         * @param {object} e
         * @return {boolean}
         */
        onMouseDown: function(e) {
            var self = this;
            var defaultPrevented = e.isDefaultPrevented();
            var $target = $(e.target);
    
            if (self.isFocused) {
                // retain focus by preventing native handling. if the
                // event target is the input it should not be modified.
                // otherwise, text selection within the input won't work.
                if (e.target !== self.$control_input[0]) {
                    if (self.settings.mode === 'single') {
                        // toggle dropdown
                        self.isOpen ? self.close() : self.open();
                    } else if (!defaultPrevented) {
                        self.setActiveItem(null);
                    }
                    return false;
                }
            } else {
                // give control focus
                if (!defaultPrevented) {
                    window.setTimeout(function() {
                        self.focus();
                    }, 0);
                }
            }
        },
    
        /**
         * Triggered when the value of the control has been changed.
         * This should propagate the event to the original DOM
         * input / select element.
         */
        onChange: function() {
            this.$input.trigger('change');
        },
    
        /**
         * Triggered on <input> keypress.
         *
         * @param {object} e
         * @returns {boolean}
         */
        onKeyPress: function(e) {
            if (this.isLocked) return e && e.preventDefault();
            var character = String.fromCharCode(e.keyCode || e.which);
            if (this.settings.create && character === this.settings.delimiter) {
                this.createItem();
                e.preventDefault();
                return false;
            }
        },
    
        /**
         * Triggered on <input> keydown.
         *
         * @param {object} e
         * @returns {boolean}
         */
        onKeyDown: function(e) {
            var isInput = e.target === this.$control_input[0];
            var self = this;
    
            if (self.isLocked) {
                if (e.keyCode !== KEY_TAB) {
                    e.preventDefault();
                }
                return;
            }
    
            switch (e.keyCode) {
                case KEY_A:
                    if (self.isCmdDown) {
                        self.selectAll();
                        return;
                    }
                    break;
                case KEY_ESC:
                    self.close();
                    return;
                case KEY_DOWN:
                    if (!self.isOpen && self.hasOptions) {
                        self.open();
                    } else if (self.$activeOption) {
                        self.ignoreHover = true;
                        var $next = self.getAdjacentOption(self.$activeOption, 1);
                        if ($next.length) self.setActiveOption($next, true, true);
                    }
                    e.preventDefault();
                    return;
                case KEY_UP:
                    if (self.$activeOption) {
                        self.ignoreHover = true;
                        var $prev = self.getAdjacentOption(self.$activeOption, -1);
                        if ($prev.length) self.setActiveOption($prev, true, true);
                    }
                    e.preventDefault();
                    return;
                case KEY_RETURN:
                    if (self.isOpen && self.$activeOption) {
                        self.onOptionSelect({currentTarget: self.$activeOption});
                    }
                    e.preventDefault();
                    return;
                case KEY_LEFT:
                    self.advanceSelection(-1, e);
                    return;
                case KEY_RIGHT:
                    self.advanceSelection(1, e);
                    return;
                case KEY_TAB:
                    if (self.settings.create && $.trim(self.$control_input.val()).length) {
                        self.createItem();
                        e.preventDefault();
                    }
                    return;
                case KEY_BACKSPACE:
                case KEY_DELETE:
                    self.deleteSelection(e);
                    return;
            }
            if (self.isFull() || self.isInputHidden) {
                e.preventDefault();
                return;
            }
        },
    
        /**
         * Triggered on <input> keyup.
         *
         * @param {object} e
         * @returns {boolean}
         */
        onKeyUp: function(e) {
            var self = this;
    
            if (self.isLocked) return e && e.preventDefault();
            var value = self.$control_input.val() || '';
            if (self.lastValue !== value) {
                self.lastValue = value;
                self.onSearchChange(value);
                self.refreshOptions();
                self.trigger('type', value);
            }
        },
    
        /**
         * Invokes the user-provide option provider / loader.
         *
         * Note: this function is debounced in the Selectize
         * constructor (by `settings.loadDelay` milliseconds)
         *
         * @param {string} value
         */
        onSearchChange: function(value) {
            var self = this;
            var fn = self.settings.load;
            if (!fn) return;
            if (self.loadedSearches.hasOwnProperty(value)) return;
            self.loadedSearches[value] = true;
            self.load(function(callback) {
                fn.apply(self, [value, callback]);
            });
        },
    
        /**
         * Triggered on <input> focus.
         *
         * @param {object} e (optional)
         * @returns {boolean}
         */
        onFocus: function(e) {
            var self = this;
    
            self.isFocused = true;
            if (self.isDisabled) {
                self.blur();
                e && e.preventDefault();
                return false;
            }
    
            if (self.ignoreFocus) return;
            if (self.settings.preload === 'focus') self.onSearchChange('');
    
            if (!self.$activeItems.length) {
                self.showInput();
                self.setActiveItem(null);
                self.refreshOptions(!!self.settings.openOnFocus);
            }
    
            self.refreshState();
        },
    
        /**
         * Triggered on <input> blur.
         *
         * @param {object} e
         * @returns {boolean}
         */
        onBlur: function(e) {
            var self = this;
            self.isFocused = false;
            if (self.ignoreFocus) return;
    
            self.close();
            self.setTextboxValue('');
            self.setActiveItem(null);
            self.setActiveOption(null);
            self.setCaret(self.items.length);
            self.refreshState();
        },
    
        /**
         * Triggered when the user rolls over
         * an option in the autocomplete dropdown menu.
         *
         * @param {object} e
         * @returns {boolean}
         */
        onOptionHover: function(e) {
            if (this.ignoreHover) return;
            this.setActiveOption(e.currentTarget, false);
        },
    
        /**
         * Triggered when the user clicks on an option
         * in the autocomplete dropdown menu.
         *
         * @param {object} e
         * @returns {boolean}
         */
        onOptionSelect: function(e) {
            var value, $target, $option, self = this;
    
            if (e.preventDefault) {
                e.preventDefault();
                e.stopPropagation();
            }
    
            $target = $(e.currentTarget);
            if ($target.hasClass('create')) {
                self.createItem();
            } else {
                value = $target.attr('data-value');
                if (value) {
                    self.setTextboxValue('');
                    self.addItem(value);
                    if (!self.settings.hideSelected && e.type && /mouse/.test(e.type)) {
                        self.setActiveOption(self.getOption(value));
                    }
                }
            }
        },
    
        /**
         * Triggered when the user clicks on an item
         * that has been selected.
         *
         * @param {object} e
         * @returns {boolean}
         */
        onItemSelect: function(e) {
            var self = this;
    
            if (self.isLocked) return;
            if (self.settings.mode === 'multi') {
                e.preventDefault();
                self.setActiveItem(e.currentTarget, e);
            }
        },
    
        /**
         * Invokes the provided method that provides
         * results to a callback---which are then added
         * as options to the control.
         *
         * @param {function} fn
         */
        load: function(fn) {
            var self = this;
            var $wrapper = self.$wrapper.addClass('loading');
    
            self.loading++;
            fn.apply(self, [function(results) {
                self.loading = Math.max(self.loading - 1, 0);
                if (results && results.length) {
                    self.addOption(results);
                    self.refreshOptions(self.isFocused && !self.isInputHidden);
                }
                if (!self.loading) {
                    $wrapper.removeClass('loading');
                }
                self.trigger('load', results);
            }]);
        },
    
        /**
         * Sets the input field of the control to the specified value.
         *
         * @param {string} value
         */
        setTextboxValue: function(value) {
            this.$control_input.val(value).triggerHandler('update');
            this.lastValue = value;
        },
    
        /**
         * Returns the value of the control. If multiple items
         * can be selected (e.g. <select multiple>), this returns
         * an array. If only one item can be selected, this
         * returns a string.
         *
         * @returns {mixed}
         */
        getValue: function() {
            if (this.tagType === TAG_SELECT && this.$input.attr('multiple')) {
                return this.items;
            } else {
                return this.items.join(this.settings.delimiter);
            }
        },
    
        /**
         * Resets the selected items to the given value.
         *
         * @param {mixed} value
         */
        setValue: function(value) {
            debounce_events(this, ['change'], function() {
                this.clear();
                var items = $.isArray(value) ? value : [value];
                for (var i = 0, n = items.length; i < n; i++) {
                    this.addItem(items[i]);
                }
            });
        },
    
        /**
         * Sets the selected item.
         *
         * @param {object} $item
         * @param {object} e (optional)
         */
        setActiveItem: function($item, e) {
            var self = this;
            var eventName;
            var i, idx, begin, end, item, swap;
            var $last;
    
            if (self.settings.mode === 'single') return;
            $item = $($item);
    
            // clear the active selection
            if (!$item.length) {
                $(self.$activeItems).removeClass('active');
                self.$activeItems = [];
                if (self.isFocused) {
                    self.showInput();
                }
                return;
            }
    
            // modify selection
            eventName = e && e.type.toLowerCase();
    
            if (eventName === 'mousedown' && self.isShiftDown && self.$activeItems.length) {
                $last = self.$control.children('.active:last');
                begin = Array.prototype.indexOf.apply(self.$control[0].childNodes, [$last[0]]);
                end   = Array.prototype.indexOf.apply(self.$control[0].childNodes, [$item[0]]);
                if (begin > end) {
                    swap  = begin;
                    begin = end;
                    end   = swap;
                }
                for (i = begin; i <= end; i++) {
                    item = self.$control[0].childNodes[i];
                    if (self.$activeItems.indexOf(item) === -1) {
                        $(item).addClass('active');
                        self.$activeItems.push(item);
                    }
                }
                e.preventDefault();
            } else if ((eventName === 'mousedown' && self.isCtrlDown) || (eventName === 'keydown' && this.isShiftDown)) {
                if ($item.hasClass('active')) {
                    idx = self.$activeItems.indexOf($item[0]);
                    self.$activeItems.splice(idx, 1);
                    $item.removeClass('active');
                } else {
                    self.$activeItems.push($item.addClass('active')[0]);
                }
            } else {
                $(self.$activeItems).removeClass('active');
                self.$activeItems = [$item.addClass('active')[0]];
            }
    
            // ensure control has focus
            self.hideInput();
            if (!this.isFocused) {
                self.focus();
            }
        },
    
        /**
         * Sets the selected item in the dropdown menu
         * of available options.
         *
         * @param {object} $object
         * @param {boolean} scroll
         * @param {boolean} animate
         */
        setActiveOption: function($option, scroll, animate) {
            var height_menu, height_item, y;
            var scroll_top, scroll_bottom;
            var self = this;
    
            if (self.$activeOption) self.$activeOption.removeClass('active');
            self.$activeOption = null;
    
            $option = $($option);
            if (!$option.length) return;
    
            self.$activeOption = $option.addClass('active');
    
            if (scroll || !isset(scroll)) {
    
                height_menu   = self.$dropdown_content.height();
                height_item   = self.$activeOption.outerHeight(true);
                scroll        = self.$dropdown_content.scrollTop() || 0;
                y             = self.$activeOption.offset().top - self.$dropdown_content.offset().top + scroll;
                scroll_top    = y;
                scroll_bottom = y - height_menu + height_item;
    
                if (y + height_item > height_menu + scroll) {
                    self.$dropdown_content.stop().animate({scrollTop: scroll_bottom}, animate ? self.settings.scrollDuration : 0);
                } else if (y < scroll) {
                    self.$dropdown_content.stop().animate({scrollTop: scroll_top}, animate ? self.settings.scrollDuration : 0);
                }
    
            }
        },
    
        /**
         * Selects all items (CTRL + A).
         */
        selectAll: function() {
            this.$activeItems = Array.prototype.slice.apply(this.$control.children(':not(input)').addClass('active'));
            if (this.$activeItems.length) {
                this.hideInput();
                this.close();
            }
            this.focus();
        },
    
        /**
         * Hides the input element out of view, while
         * retaining its focus.
         */
        hideInput: function() {
            var self = this;
    
            self.setTextboxValue('');
            self.$control_input.css({opacity: 0, position: 'absolute', left: self.rtl ? 10000 : -10000});
            self.isInputHidden = true;
        },
    
        /**
         * Restores input visibility.
         */
        showInput: function() {
            this.$control_input.css({opacity: 1, position: 'relative', left: 0});
            this.isInputHidden = false;
        },
    
        /**
         * Gives the control focus. If "trigger" is falsy,
         * focus handlers won't be fired--causing the focus
         * to happen silently in the background.
         *
         * @param {boolean} trigger
         */
        focus: function() {
            var self = this;
            if (self.isDisabled) return;
    
            self.ignoreFocus = true;
            self.$control_input[0].focus();
            window.setTimeout(function() {
                self.ignoreFocus = false;
                self.onFocus();
            }, 0);
        },
    
        /**
         * Forces the control out of focus.
         */
        blur: function() {
            this.$control_input.trigger('blur');
        },
    
        /**
         * Returns a function that scores an object
         * to show how good of a match it is to the
         * provided query.
         *
         * @param {string} query
         * @param {object} options
         * @return {function}
         */
        getScoreFunction: function(query) {
            return this.sifter.getScoreFunction(query, this.getSearchOptions());
        },
    
        /**
         * Returns search options for sifter (the system
         * for scoring and sorting results).
         *
         * @see https://github.com/brianreavis/sifter.js
         * @return {object}
         */
        getSearchOptions: function() {
            var settings = this.settings;
            var sort = settings.sortField;
            if (typeof sort === 'string') {
                sort = {field: sort};
            }
    
            return {
                fields      : settings.searchField,
                conjunction : settings.searchConjunction,
                sort        : sort
            };
        },
    
        /**
         * Searches through available options and returns
         * a sorted array of matches.
         *
         * Returns an object containing:
         *
         *   - query {string}
         *   - tokens {array}
         *   - total {int}
         *   - items {array}
         *
         * @param {string} query
         * @returns {object}
         */
        search: function(query) {
            var i, value, score, result, calculateScore;
            var self     = this;
            var settings = self.settings;
            var options  = this.getSearchOptions();
    
            // validate user-provided result scoring function
            if (settings.score) {
                calculateScore = self.settings.score.apply(this, [query]);
                if (typeof calculateScore !== 'function') {
                    throw new Error('Selectize "score" setting must be a function that returns a function');
                }
            }
    
            // perform search
            if (query !== self.lastQuery) {
                self.lastQuery = query;
                result = self.sifter.search(query, $.extend(options, {score: calculateScore}));
                self.currentResults = result;
            } else {
                result = $.extend(true, {}, self.currentResults);
            }
    
            // filter out selected items
            if (settings.hideSelected) {
                for (i = result.items.length - 1; i >= 0; i--) {
                    if (self.items.indexOf(hash_key(result.items[i].id)) !== -1) {
                        result.items.splice(i, 1);
                    }
                }
            }
    
            return result;
        },
    
        /**
         * Refreshes the list of available options shown
         * in the autocomplete dropdown menu.
         *
         * @param {boolean} triggerDropdown
         */
        refreshOptions: function(triggerDropdown) {
            var i, j, k, n, groups, groups_order, option, option_html, optgroup, optgroups, html, html_children, has_create_option;
            var $active, $active_before, $create;
    
            if (typeof triggerDropdown === 'undefined') {
                triggerDropdown = true;
            }
    
            var self              = this;
            var query             = self.$control_input.val();
            var results           = self.search(query);
            var $dropdown_content = self.$dropdown_content;
            var active_before     = self.$activeOption && hash_key(self.$activeOption.attr('data-value'));
    
            // build markup
            n = results.items.length;
            if (typeof self.settings.maxOptions === 'number') {
                n = Math.min(n, self.settings.maxOptions);
            }
    
            // render and group available options individually
            groups = {};
    
            if (self.settings.optgroupOrder) {
                groups_order = self.settings.optgroupOrder;
                for (i = 0; i < groups_order.length; i++) {
                    groups[groups_order[i]] = [];
                }
            } else {
                groups_order = [];
            }
    
            for (i = 0; i < n; i++) {
                option      = self.options[results.items[i].id];
                option_html = self.render('option', option);
                optgroup    = option[self.settings.optgroupField] || '';
                optgroups   = $.isArray(optgroup) ? optgroup : [optgroup];
    
                for (j = 0, k = optgroups && optgroups.length; j < k; j++) {
                    optgroup = optgroups[j];
                    if (!self.optgroups.hasOwnProperty(optgroup)) {
                        optgroup = '';
                    }
                    if (!groups.hasOwnProperty(optgroup)) {
                        groups[optgroup] = [];
                        groups_order.push(optgroup);
                    }
                    groups[optgroup].push(option_html);
                }
            }
    
            // render optgroup headers & join groups
            html = [];
            for (i = 0, n = groups_order.length; i < n; i++) {
                optgroup = groups_order[i];
                if (self.optgroups.hasOwnProperty(optgroup) && groups[optgroup].length) {
                    // render the optgroup header and options within it,
                    // then pass it to the wrapper template
                    html_children = self.render('optgroup_header', self.optgroups[optgroup]) || '';
                    html_children += groups[optgroup].join('');
                    html.push(self.render('optgroup', $.extend({}, self.optgroups[optgroup], {
                        html: html_children
                    })));
                } else {
                    html.push(groups[optgroup].join(''));
                }
            }
    
            $dropdown_content.html(html.join(''));
    
            // highlight matching terms inline
            if (self.settings.highlight && results.query.length && results.tokens.length) {
                for (i = 0, n = results.tokens.length; i < n; i++) {
                    highlight($dropdown_content, results.tokens[i].regex);
                }
            }
    
            // add "selected" class to selected options
            if (!self.settings.hideSelected) {
                for (i = 0, n = self.items.length; i < n; i++) {
                    self.getOption(self.items[i]).addClass('selected');
                }
            }
    
            // add create option
            has_create_option = self.settings.create && results.query.length;
            if (has_create_option) {
                $dropdown_content.prepend(self.render('option_create', {input: query}));
                $create = $($dropdown_content[0].childNodes[0]);
            }
    
            // activate
            self.hasOptions = results.items.length > 0 || has_create_option;
            if (self.hasOptions) {
                if (results.items.length > 0) {
                    $active_before = active_before && self.getOption(active_before);
                    if ($active_before && $active_before.length) {
                        $active = $active_before;
                    } else if (self.settings.mode === 'single' && self.items.length) {
                        $active = self.getOption(self.items[0]);
                    }
                    if (!$active || !$active.length) {
                        if ($create && !self.settings.addPrecedence) {
                            $active = self.getAdjacentOption($create, 1);
                        } else {
                            $active = $dropdown_content.find('[data-selectable]:first');
                        }
                    }
                } else {
                    $active = $create;
                }
                self.setActiveOption($active);
                if (triggerDropdown && !self.isOpen) { self.open(); }
            } else {
                self.setActiveOption(null);
                if (triggerDropdown && self.isOpen) { self.close(); }
            }
        },
    
        /**
         * Adds an available option. If it already exists,
         * nothing will happen. Note: this does not refresh
         * the options list dropdown (use `refreshOptions`
         * for that).
         *
         * Usage:
         *
         *   this.addOption(data)
         *
         * @param {object} data
         */
        addOption: function(data) {
            var i, n, optgroup, value, self = this;
    
            if ($.isArray(data)) {
                for (i = 0, n = data.length; i < n; i++) {
                    self.addOption(data[i]);
                }
                return;
            }
    
            value = hash_key(data[self.settings.valueField]);
            if (!value || self.options.hasOwnProperty(value)) return;
    
            self.userOptions[value] = true;
            self.options[value] = data;
            self.lastQuery = null;
            self.trigger('option_add', value, data);
        },
    
        /**
         * Registers a new optgroup for options
         * to be bucketed into.
         *
         * @param {string} id
         * @param {object} data
         */
        addOptionGroup: function(id, data) {
            this.optgroups[id] = data;
            this.trigger('optgroup_add', id, data);
        },
    
        /**
         * Updates an option available for selection. If
         * it is visible in the selected items or options
         * dropdown, it will be re-rendered automatically.
         *
         * @param {string} value
         * @param {object} data
         */
        updateOption: function(value, data) {
            var self = this;
            var $item, $item_new;
            var value_new, index_item, cache_items, cache_options;
    
            value     = hash_key(value);
            value_new = hash_key(data[self.settings.valueField]);
    
            // sanity checks
            if (!self.options.hasOwnProperty(value)) return;
            if (!value_new) throw new Error('Value must be set in option data');
    
            // update references
            if (value_new !== value) {
                delete self.options[value];
                index_item = self.items.indexOf(value);
                if (index_item !== -1) {
                    self.items.splice(index_item, 1, value_new);
                }
            }
            self.options[value_new] = data;
    
            // invalidate render cache
            cache_items = self.renderCache['item'];
            cache_options = self.renderCache['option'];
    
            if (isset(cache_items)) {
                delete cache_items[value];
                delete cache_items[value_new];
            }
            if (isset(cache_options)) {
                delete cache_options[value];
                delete cache_options[value_new];
            }
    
            // update the item if it's selected
            if (self.items.indexOf(value_new) !== -1) {
                $item = self.getItem(value);
                $item_new = $(self.render('item', data));
                if ($item.hasClass('active')) $item_new.addClass('active');
                $item.replaceWith($item_new);
            }
    
            // update dropdown contents
            if (self.isOpen) {
                self.refreshOptions(false);
            }
        },
    
        /**
         * Removes a single option.
         *
         * @param {string} value
         */
        removeOption: function(value) {
            var self = this;
    
            value = hash_key(value);
            delete self.userOptions[value];
            delete self.options[value];
            self.lastQuery = null;
            self.trigger('option_remove', value);
            self.removeItem(value);
        },
    
        /**
         * Clears all options.
         */
        clearOptions: function() {
            var self = this;
    
            self.loadedSearches = {};
            self.userOptions = {};
            self.options = self.sifter.items = {};
            self.lastQuery = null;
            self.trigger('option_clear');
            self.clear();
        },
    
        /**
         * Returns the jQuery element of the option
         * matching the given value.
         *
         * @param {string} value
         * @returns {object}
         */
        getOption: function(value) {
            return this.getElementWithValue(value, this.$dropdown_content.find('[data-selectable]'));
        },
    
        /**
         * Returns the jQuery element of the next or
         * previous selectable option.
         *
         * @param {object} $option
         * @param {int} direction  can be 1 for next or -1 for previous
         * @return {object}
         */
        getAdjacentOption: function($option, direction) {
            var $options = this.$dropdown.find('[data-selectable]');
            var index    = $options.index($option) + direction;
    
            return index >= 0 && index < $options.length ? $options.eq(index) : $();
        },
    
        /**
         * Finds the first element with a "data-value" attribute
         * that matches the given value.
         *
         * @param {mixed} value
         * @param {object} $els
         * @return {object}
         */
        getElementWithValue: function(value, $els) {
            value = hash_key(value);
    
            if (value) {
                for (var i = 0, n = $els.length; i < n; i++) {
                    if ($els[i].getAttribute('data-value') === value) {
                        return $($els[i]);
                    }
                }
            }
    
            return $();
        },
    
        /**
         * Returns the jQuery element of the item
         * matching the given value.
         *
         * @param {string} value
         * @returns {object}
         */
        getItem: function(value) {
            return this.getElementWithValue(value, this.$control.children());
        },
    
        /**
         * "Selects" an item. Adds it to the list
         * at the current caret position.
         *
         * @param {string} value
         */
        addItem: function(value) {
            debounce_events(this, ['change'], function() {
                var $item, $option;
                var self = this;
                var inputMode = self.settings.mode;
                var i, active, options, value_next;
                value = hash_key(value);
    
                if (self.items.indexOf(value) !== -1) {
                    if (inputMode === 'single') self.close();
                    return;
                }
    
                if (!self.options.hasOwnProperty(value)) return;
                if (inputMode === 'single') self.clear();
                if (inputMode === 'multi' && self.isFull()) return;
    
                $item = $(self.render('item', self.options[value]));
                self.items.splice(self.caretPos, 0, value);
                self.insertAtCaret($item);
                self.refreshState();
    
                if (self.isSetup) {
                    options = self.$dropdown_content.find('[data-selectable]');
    
                    // update menu / remove the option
                    $option = self.getOption(value);
                    value_next = self.getAdjacentOption($option, 1).attr('data-value');
                    self.refreshOptions(self.isFocused && inputMode !== 'single');
                    if (value_next) {
                        self.setActiveOption(self.getOption(value_next));
                    }
    
                    // hide the menu if the maximum number of items have been selected or no options are left
                    if (!options.length || (self.settings.maxItems !== null && self.items.length >= self.settings.maxItems)) {
                        self.close();
                    } else {
                        self.positionDropdown();
                    }
    
                    self.updatePlaceholder();
                    self.trigger('item_add', value, $item);
                    self.updateOriginalInput();
                }
            });
        },
    
        /**
         * Removes the selected item matching
         * the provided value.
         *
         * @param {string} value
         */
        removeItem: function(value) {
            var self = this;
            var $item, i, idx;
    
            $item = (typeof value === 'object') ? value : self.getItem(value);
            value = hash_key($item.attr('data-value'));
            i = self.items.indexOf(value);
    
            if (i !== -1) {
                $item.remove();
                if ($item.hasClass('active')) {
                    idx = self.$activeItems.indexOf($item[0]);
                    self.$activeItems.splice(idx, 1);
                }
    
                self.items.splice(i, 1);
                self.lastQuery = null;
                if (!self.settings.persist && self.userOptions.hasOwnProperty(value)) {
                    self.removeOption(value);
                }
    
                if (i < self.caretPos) {
                    self.setCaret(self.caretPos - 1);
                }
    
                self.refreshState();
                self.updatePlaceholder();
                self.updateOriginalInput();
                self.positionDropdown();
                self.trigger('item_remove', value);
            }
        },
    
        /**
         * Invokes the `create` method provided in the
         * selectize options that should provide the data
         * for the new item, given the user input.
         *
         * Once this completes, it will be added
         * to the item list.
         */
        createItem: function() {
            var self  = this;
            var input = $.trim(self.$control_input.val() || '');
            var caret = self.caretPos;
            if (!input.length) return;
            self.lock();
    
            var setup = (typeof self.settings.create === 'function') ? this.settings.create : function(input) {
                var data = {};
                data[self.settings.labelField] = input;
                data[self.settings.valueField] = input;
                return data;
            };
    
            var create = once(function(data) {
                self.unlock();
    
                if (!data || typeof data !== 'object') return;
                var value = hash_key(data[self.settings.valueField]);
                if (!value) return;
    
                self.setTextboxValue('');
                self.addOption(data);
                self.setCaret(caret);
                self.addItem(value);
                self.refreshOptions(self.settings.mode !== 'single');
            });
    
            var output = setup.apply(this, [input, create]);
            if (typeof output !== 'undefined') {
                create(output);
            }
        },
    
        /**
         * Re-renders the selected item lists.
         */
        refreshItems: function() {
            this.lastQuery = null;
    
            if (this.isSetup) {
                for (var i = 0; i < this.items.length; i++) {
                    this.addItem(this.items);
                }
            }
    
            this.refreshState();
            this.updateOriginalInput();
        },
    
        /**
         * Updates all state-dependent attributes
         * and CSS classes.
         */
        refreshState: function() {
            var self = this;
            var invalid = self.isRequired && !self.items.length;
            if (!invalid) self.isInvalid = false;
            self.$control_input.prop('required', invalid);
            self.refreshClasses();
        },
    
        /**
         * Updates all state-dependent CSS classes.
         */
        refreshClasses: function() {
            var self     = this;
            var isFull   = self.isFull();
            var isLocked = self.isLocked;
    
            self.$wrapper
                .toggleClass('rtl', self.rtl);
    
            self.$control
                .toggleClass('focus', self.isFocused)
                .toggleClass('disabled', self.isDisabled)
                .toggleClass('required', self.isRequired)
                .toggleClass('invalid', self.isInvalid)
                .toggleClass('locked', isLocked)
                .toggleClass('full', isFull).toggleClass('not-full', !isFull)
                .toggleClass('input-active', self.isFocused && !self.isInputHidden)
                .toggleClass('dropdown-active', self.isOpen)
                .toggleClass('has-options', !$.isEmptyObject(self.options))
                .toggleClass('has-items', self.items.length > 0);
    
            self.$control_input.data('grow', !isFull && !isLocked);
        },
    
        /**
         * Determines whether or not more items can be added
         * to the control without exceeding the user-defined maximum.
         *
         * @returns {boolean}
         */
        isFull: function() {
            return this.settings.maxItems !== null && this.items.length >= this.settings.maxItems;
        },
    
        /**
         * Refreshes the original <select> or <input>
         * element to reflect the current state.
         */
        updateOriginalInput: function() {
            var i, n, options, self = this;
    
            if (self.$input[0].tagName.toLowerCase() === 'select') {
                options = [];
                for (i = 0, n = self.items.length; i < n; i++) {
                    options.push('<option value="' + escape_html(self.items[i]) + '" selected="selected"></option>');
                }
                if (!options.length && !this.$input.attr('multiple')) {
                    options.push('<option value="" selected="selected"></option>');
                }
                self.$input.html(options.join(''));
            } else {
                self.$input.val(self.getValue());
            }
    
            if (self.isSetup) {
                self.trigger('change', self.$input.val());
            }
        },
    
        /**
         * Shows/hide the input placeholder depending
         * on if there items in the list already.
         */
        updatePlaceholder: function() {
            if (!this.settings.placeholder) return;
            var $input = this.$control_input;
    
            if (this.items.length) {
                $input.removeAttr('placeholder');
            } else {
                $input.attr('placeholder', this.settings.placeholder);
            }
            $input.triggerHandler('update');
        },
    
        /**
         * Shows the autocomplete dropdown containing
         * the available options.
         */
        open: function() {
            var self = this;
    
            if (self.isLocked || self.isOpen || (self.settings.mode === 'multi' && self.isFull())) return;
            self.focus();
            self.isOpen = true;
            self.refreshState();
            self.$dropdown.css({visibility: 'hidden', display: 'block'});
            self.positionDropdown();
            self.$dropdown.css({visibility: 'visible'});
            self.trigger('dropdown_open', self.$dropdown);
        },
    
        /**
         * Closes the autocomplete dropdown menu.
         */
        close: function() {
            var self = this;
            var trigger = self.isOpen;
    
            if (self.settings.mode === 'single' && self.items.length) {
                self.hideInput();
            }
    
            self.isOpen = false;
            self.$dropdown.hide();
            self.setActiveOption(null);
            self.refreshState();
    
            if (trigger) self.trigger('dropdown_close', self.$dropdown);
        },
    
        /**
         * Calculates and applies the appropriate
         * position of the dropdown.
         */
        positionDropdown: function() {
            var $control = this.$control;
            var offset = this.settings.dropdownParent === 'body' ? $control.offset() : $control.position();
            offset.top += $control.outerHeight(true);
    
            this.$dropdown.css({
                width : $control.outerWidth(),
                top   : offset.top,
                left  : offset.left
            });
        },
    
        /**
         * Resets / clears all selected items
         * from the control.
         */
        clear: function() {
            var self = this;
    
            if (!self.items.length) return;
            self.$control.children(':not(input)').remove();
            self.items = [];
            self.setCaret(0);
            self.updatePlaceholder();
            self.updateOriginalInput();
            self.refreshState();
            self.showInput();
            self.trigger('clear');
        },
    
        /**
         * A helper method for inserting an element
         * at the current caret position.
         *
         * @param {object} $el
         */
        insertAtCaret: function($el) {
            var caret = Math.min(this.caretPos, this.items.length);
            if (caret === 0) {
                this.$control.prepend($el);
            } else {
                $(this.$control[0].childNodes[caret]).before($el);
            }
            this.setCaret(caret + 1);
        },
    
        /**
         * Removes the current selected item(s).
         *
         * @param {object} e (optional)
         * @returns {boolean}
         */
        deleteSelection: function(e) {
            var i, n, direction, selection, values, caret, option_select, $option_select, $tail;
            var self = this;
    
            direction = (e && e.keyCode === KEY_BACKSPACE) ? -1 : 1;
            selection = getSelection(self.$control_input[0]);
    
            if (self.$activeOption && !self.settings.hideSelected) {
                option_select = self.getAdjacentOption(self.$activeOption, -1).attr('data-value');
            }
    
            // determine items that will be removed
            values = [];
    
            if (self.$activeItems.length) {
                $tail = self.$control.children('.active:' + (direction > 0 ? 'last' : 'first'));
                caret = self.$control.children(':not(input)').index($tail);
                if (direction > 0) { caret++; }
    
                for (i = 0, n = self.$activeItems.length; i < n; i++) {
                    values.push($(self.$activeItems[i]).attr('data-value'));
                }
                if (e) {
                    e.preventDefault();
                    e.stopPropagation();
                }
            } else if ((self.isFocused || self.settings.mode === 'single') && self.items.length) {
                if (direction < 0 && selection.start === 0 && selection.length === 0) {
                    values.push(self.items[self.caretPos - 1]);
                } else if (direction > 0 && selection.start === self.$control_input.val().length) {
                    values.push(self.items[self.caretPos]);
                }
            }
    
            // allow the callback to abort
            if (!values.length || (typeof self.settings.onDelete === 'function' && self.settings.onDelete.apply(self, [values]) === false)) {
                return false;
            }
    
            // perform removal
            if (typeof caret !== 'undefined') {
                self.setCaret(caret);
            }
            while (values.length) {
                self.removeItem(values.pop());
            }
    
            self.showInput();
            self.refreshOptions(true);
    
            // select previous option
            if (option_select) {
                $option_select = self.getOption(option_select);
                if ($option_select.length) {
                    self.setActiveOption($option_select);
                }
            }
    
            return true;
        },
    
        /**
         * Selects the previous / next item (depending
         * on the `direction` argument).
         *
         * > 0 - right
         * < 0 - left
         *
         * @param {int} direction
         * @param {object} e (optional)
         */
        advanceSelection: function(direction, e) {
            var tail, selection, idx, valueLength, cursorAtEdge, $tail;
            var self = this;
    
            if (direction === 0) return;
            if (self.rtl) direction *= -1;
    
            tail = direction > 0 ? 'last' : 'first';
            selection = getSelection(self.$control_input[0]);
    
            if (self.isFocused && !self.isInputHidden) {
                valueLength = self.$control_input.val().length;
                cursorAtEdge = direction < 0
                    ? selection.start === 0 && selection.length === 0
                    : selection.start === valueLength;
    
                if (cursorAtEdge && !valueLength) {
                    self.advanceCaret(direction, e);
                }
            } else {
                $tail = self.$control.children('.active:' + tail);
                if ($tail.length) {
                    idx = self.$control.children(':not(input)').index($tail);
                    self.setActiveItem(null);
                    self.setCaret(direction > 0 ? idx + 1 : idx);
                }
            }
        },
    
        /**
         * Moves the caret left / right.
         *
         * @param {int} direction
         * @param {object} e (optional)
         */
        advanceCaret: function(direction, e) {
            var self = this, fn, $adj;
    
            if (direction === 0) return;
    
            fn = direction > 0 ? 'next' : 'prev';
            if (self.isShiftDown) {
                $adj = self.$control_input[fn]();
                if ($adj.length) {
                    self.hideInput();
                    self.setActiveItem($adj);
                    e && e.preventDefault();
                }
            } else {
                self.setCaret(self.caretPos + direction);
            }
        },
    
        /**
         * Moves the caret to the specified index.
         *
         * @param {int} i
         */
        setCaret: function(i) {
            var self = this;
    
            if (self.settings.mode === 'single') {
                i = self.items.length;
            } else {
                i = Math.max(0, Math.min(self.items.length, i));
            }
    
            // the input must be moved by leaving it in place and moving the
            // siblings, due to the fact that focus cannot be restored once lost
            // on mobile webkit devices
            var j, n, fn, $children, $child;
            $children = self.$control.children(':not(input)');
            for (j = 0, n = $children.length; j < n; j++) {
                $child = $($children[j]).detach();
                if (j <  i) {
                    self.$control_input.before($child);
                } else {
                    self.$control.append($child);
                }
            }
    
            self.caretPos = i;
        },
    
        /**
         * Disables user input on the control. Used while
         * items are being asynchronously created.
         */
        lock: function() {
            this.close();
            this.isLocked = true;
            this.refreshState();
        },
    
        /**
         * Re-enables user input on the control.
         */
        unlock: function() {
            this.isLocked = false;
            this.refreshState();
        },
    
        /**
         * Disables user input on the control completely.
         * While disabled, it cannot receive focus.
         */
        disable: function() {
            var self = this;
            self.$input.prop('disabled', true);
            self.isDisabled = true;
            self.lock();
        },
    
        /**
         * Enables the control so that it can respond
         * to focus and user input.
         */
        enable: function() {
            var self = this;
            self.$input.prop('disabled', false);
            self.isDisabled = false;
            self.unlock();
        },
    
        /**
         * Completely destroys the control and
         * unbinds all event listeners so that it can
         * be garbage collected.
         */
        destroy: function() {
            var self = this;
            var eventNS = self.eventNS;
            var revertSettings = self.revertSettings;
    
            self.trigger('destroy');
            self.off();
            self.$wrapper.remove();
            self.$dropdown.remove();
    
            self.$input
                .html('')
                .append(revertSettings.$children)
                .removeAttr('tabindex')
                .attr({tabindex: revertSettings.tabindex})
                .show();
    
            $(window).off(eventNS);
            $(document).off(eventNS);
            $(document.body).off(eventNS);
    
            delete self.$input[0].selectize;
        },
    
        /**
         * A helper method for rendering "item" and
         * "option" templates, given the data.
         *
         * @param {string} templateName
         * @param {object} data
         * @returns {string}
         */
        render: function(templateName, data) {
            var value, id, label;
            var html = '';
            var cache = false;
            var self = this;
            var regex_tag = /^[	 ]*<([a-z][a-z0-9-_]*(?::[a-z][a-z0-9-_]*)?)/i;
    
            if (templateName === 'option' || templateName === 'item') {
                value = hash_key(data[self.settings.valueField]);
                cache = !!value;
            }
    
            // pull markup from cache if it exists
            if (cache) {
                if (!isset(self.renderCache[templateName])) {
                    self.renderCache[templateName] = {};
                }
                if (self.renderCache[templateName].hasOwnProperty(value)) {
                    return self.renderCache[templateName][value];
                }
            }
    
            // render markup
            html = self.settings.render[templateName].apply(this, [data, escape_html]);
    
            // add mandatory attributes
            if (templateName === 'option' || templateName === 'option_create') {
                html = html.replace(regex_tag, '<$1 data-selectable');
            }
            if (templateName === 'optgroup') {
                id = data[self.settings.optgroupValueField] || '';
                html = html.replace(regex_tag, '<$1 data-group="' + escape_replace(escape_html(id)) + '"');
            }
            if (templateName === 'option' || templateName === 'item') {
                html = html.replace(regex_tag, '<$1 data-value="' + escape_replace(escape_html(value || '')) + '"');
            }
    
            // update cache
            if (cache) {
                self.renderCache[templateName][value] = html;
            }
    
            return html;
        }
    
    });
    
    
    Selectize.count = 0;
    Selectize.defaults = {
        plugins: [],
        delimiter: ',',
        persist: true,
        diacritics: true,
        create: false,
        highlight: true,
        openOnFocus: true,
        maxOptions: 1000,
        maxItems: null,
        hideSelected: null,
        addPrecedence: false,
        preload: false,
    
        scrollDuration: 60,
        loadThrottle: 300,
    
        dataAttr: 'data-data',
        optgroupField: 'optgroup',
        valueField: 'value',
        labelField: 'text',
        optgroupLabelField: 'label',
        optgroupValueField: 'value',
        optgroupOrder: null,
    
        sortField: '$order',
        searchField: ['text'],
        searchConjunction: 'and',
    
        mode: null,
        wrapperClass: 'selectize-control',
        inputClass: 'selectize-input',
        dropdownClass: 'selectize-dropdown',
        dropdownContentClass: 'selectize-dropdown-content',
    
        dropdownParent: null,
    
        /*
        load            : null, // function(query, callback) { ... }
        score           : null, // function(search) { ... }
        onInitialize    : null, // function() { ... }
        onChange        : null, // function(value) { ... }
        onItemAdd       : null, // function(value, $item) { ... }
        onItemRemove    : null, // function(value) { ... }
        onClear         : null, // function() { ... }
        onOptionAdd     : null, // function(value, data) { ... }
        onOptionRemove  : null, // function(value) { ... }
        onOptionClear   : null, // function() { ... }
        onDropdownOpen  : null, // function($dropdown) { ... }
        onDropdownClose : null, // function($dropdown) { ... }
        onType          : null, // function(str) { ... }
        onDelete        : null, // function(values) { ... }
        */
    
        render: {
            /*
            item: null,
            optgroup: null,
            optgroup_header: null,
            option: null,
            option_create: null
            */
        }
    };
    
    $.fn.selectize = function(settings_user) {
        var defaults             = $.fn.selectize.defaults;
        var settings             = $.extend({}, defaults, settings_user);
        var attr_data            = settings.dataAttr;
        var field_label          = settings.labelField;
        var field_value          = settings.valueField;
        var field_optgroup       = settings.optgroupField;
        var field_optgroup_label = settings.optgroupLabelField;
        var field_optgroup_value = settings.optgroupValueField;
    
        /**
         * Initializes selectize from a <input type="text"> element.
         *
         * @param {object} $input
         * @param {object} settings_element
         */
        var init_textbox = function($input, settings_element) {
            var i, n, values, option, value = $.trim($input.val() || '');
            if (!value.length) return;
    
            values = value.split(settings.delimiter);
            for (i = 0, n = values.length; i < n; i++) {
                option = {};
                option[field_label] = values[i];
                option[field_value] = values[i];
    
                settings_element.options[values[i]] = option;
            }
    
            settings_element.items = values;
        };
    
        /**
         * Initializes selectize from a <select> element.
         *
         * @param {object} $input
         * @param {object} settings_element
         */
        var init_select = function($input, settings_element) {
            var i, n, tagName, $children, order = 0;
            var options = settings_element.options;
    
            var readData = function($el) {
                var data = attr_data && $el.attr(attr_data);
                if (typeof data === 'string' && data.length) {
                    return JSON.parse(data);
                }
                return null;
            };
    
            var addOption = function($option, group) {
                var value, option;
    
                $option = $($option);
    
                value = $option.attr('value') || '';
                if (!value.length) return;
    
                // if the option already exists, it's probably been
                // duplicated in another optgroup. in this case, push
                // the current group to the "optgroup" property on the
                // existing option so that it's rendered in both places.
                if (options.hasOwnProperty(value)) {
                    if (group) {
                        if (!options[value].optgroup) {
                            options[value].optgroup = group;
                        } else if (!$.isArray(options[value].optgroup)) {
                            options[value].optgroup = [options[value].optgroup, group];
                        } else {
                            options[value].optgroup.push(group);
                        }
                    }
                    return;
                }
    
                option                 = readData($option) || {};
                option[field_label]    = option[field_label] || $option.text();
                option[field_value]    = option[field_value] || value;
                option[field_optgroup] = option[field_optgroup] || group;
    
                option.$order = ++order;
                options[value] = option;
    
                if ($option.is(':selected')) {
                    settings_element.items.push(value);
                }
            };
    
            var addGroup = function($optgroup) {
                var i, n, id, optgroup, $options;
    
                $optgroup = $($optgroup);
                id = $optgroup.attr('label');
    
                if (id) {
                    optgroup = readData($optgroup) || {};
                    optgroup[field_optgroup_label] = id;
                    optgroup[field_optgroup_value] = id;
                    settings_element.optgroups[id] = optgroup;
                }
    
                $options = $('option', $optgroup);
                for (i = 0, n = $options.length; i < n; i++) {
                    addOption($options[i], id);
                }
            };
    
            settings_element.maxItems = $input.attr('multiple') ? null : 1;
    
            $children = $input.children();
            for (i = 0, n = $children.length; i < n; i++) {
                tagName = $children[i].tagName.toLowerCase();
                if (tagName === 'optgroup') {
                    addGroup($children[i]);
                } else if (tagName === 'option') {
                    addOption($children[i]);
                }
            }
        };
    
        return this.each(function() {
            if (this.selectize) return;
    
            var instance;
            var $input = $(this);
            var tag_name = this.tagName.toLowerCase();
            var settings_element = {
                'placeholder' : $input.children('option[value=""]').text() || $input.attr('placeholder'),
                'options'     : {},
                'optgroups'   : {},
                'items'       : []
            };
    
            if (tag_name === 'select') {
                init_select($input, settings_element);
            } else {
                init_textbox($input, settings_element);
            }
    
            instance = new Selectize($input, $.extend(true, {}, defaults, settings_element, settings_user));
            $input.data('selectize', instance);
            $input.addClass('selectized');
        });
    };
    
    $.fn.selectize.defaults = Selectize.defaults;
    
    Selectize.define('drag_drop', function(options) {
        if (!$.fn.sortable) throw new Error('The "drag_drop" plugin requires jQuery UI "sortable".');
        if (this.settings.mode !== 'multi') return;
        var self = this;
    
        self.lock = (function() {
            var original = self.lock;
            return function() {
                var sortable = self.$control.data('sortable');
                if (sortable) sortable.disable();
                return original.apply(self, arguments);
            };
        })();
    
        self.unlock = (function() {
            var original = self.unlock;
            return function() {
                var sortable = self.$control.data('sortable');
                if (sortable) sortable.enable();
                return original.apply(self, arguments);
            };
        })();
    
        self.setup = (function() {
            var original = self.setup;
            return function() {
                original.apply(this, arguments);
    
                var $control = self.$control.sortable({
                    items: '[data-value]',
                    forcePlaceholderSize: true,
                    disabled: self.isLocked,
                    start: function(e, ui) {
                        ui.placeholder.css('width', ui.helper.css('width'));
                        $control.css({overflow: 'visible'});
                    },
                    stop: function() {
                        $control.css({overflow: 'hidden'});
                        var active = self.$activeItems ? self.$activeItems.slice() : null;
                        var values = [];
                        $control.children('[data-value]').each(function() {
                            values.push($(this).attr('data-value'));
                        });
                        self.setValue(values);
                        self.setActiveItem(active);
                    }
                });
            };
        })();
    
    });
    
    Selectize.define('dropdown_header', function(options) {
        var self = this;
    
        options = $.extend({
            title         : 'Untitled',
            headerClass   : 'selectize-dropdown-header',
            titleRowClass : 'selectize-dropdown-header-title',
            labelClass    : 'selectize-dropdown-header-label',
            closeClass    : 'selectize-dropdown-header-close',
    
            html: function(data) {
                return (
                    '<div class="' + data.headerClass + '">' +
                        '<div class="' + data.titleRowClass + '">' +
                            '<span class="' + data.labelClass + '">' + data.title + '</span>' +
                            '<a href="javascript:void(0)" class="' + data.closeClass + '">&times;</a>' +
                        '</div>' +
                    '</div>'
                );
            }
        }, options);
    
        self.setup = (function() {
            var original = self.setup;
            return function() {
                original.apply(self, arguments);
                self.$dropdown_header = $(options.html(options));
                self.$dropdown.prepend(self.$dropdown_header);
            };
        })();
    
    });
    
    Selectize.define('optgroup_columns', function(options) {
        var self = this;
    
        options = $.extend({
            equalizeWidth  : true,
            equalizeHeight : true
        }, options);
    
        this.getAdjacentOption = function($option, direction) {
            var $options = $option.closest('[data-group]').find('[data-selectable]');
            var index    = $options.index($option) + direction;
    
            return index >= 0 && index < $options.length ? $options.eq(index) : $();
        };
    
        this.onKeyDown = (function() {
            var original = self.onKeyDown;
            return function(e) {
                var index, $option, $options, $optgroup;
    
                if (this.isOpen && (e.keyCode === KEY_LEFT || e.keyCode === KEY_RIGHT)) {
                    self.ignoreHover = true;
                    $optgroup = this.$activeOption.closest('[data-group]');
                    index = $optgroup.find('[data-selectable]').index(this.$activeOption);
    
                    if(e.keyCode === KEY_LEFT) {
                        $optgroup = $optgroup.prev('[data-group]');
                    } else {
                        $optgroup = $optgroup.next('[data-group]');
                    }
    
                    $options = $optgroup.find('[data-selectable]');
                    $option  = $options.eq(Math.min($options.length - 1, index));
                    if ($option.length) {
                        this.setActiveOption($option);
                    }
                    return;
                }
    
                return original.apply(this, arguments);
            };
        })();
    
        var equalizeSizes = function() {
            var i, n, height_max, width, width_last, width_parent, $optgroups;
    
            $optgroups = $('[data-group]', self.$dropdown_content);
            n = $optgroups.length;
            if (!n || !self.$dropdown_content.width()) return;
    
            if (options.equalizeHeight) {
                height_max = 0;
                for (i = 0; i < n; i++) {
                    height_max = Math.max(height_max, $optgroups.eq(i).height());
                }
                $optgroups.css({height: height_max});
            }
    
            if (options.equalizeWidth) {
                width_parent = self.$dropdown_content.innerWidth();
                width = Math.round(width_parent / n);
                $optgroups.css({ width});
                if (n > 1) {
                    width_last = width_parent - width * (n - 1);
                    $optgroups.eq(n - 1).css({ width_last});
                }
            }
        };
    
        if (options.equalizeHeight || options.equalizeWidth) {
            hook.after(this, 'positionDropdown', equalizeSizes);
            hook.after(this, 'refreshOptions', equalizeSizes);
        }
    
    
    });
    
    Selectize.define('remove_button', function(options) {
        if (this.settings.mode === 'single') return;
    
        options = $.extend({
            label     : '&times;',
            title     : 'Remove',
            className : 'remove',
            append    : true
        }, options);
    
        var self = this;
        var html = '<a href="javascript:void(0)" class="' + options.className + '" tabindex="-1" title="' + escape_html(options.title) + '">' + options.label + '</a>';
    
        /**
         * Appends an element as a child (with raw HTML).
         *
         * @param {string} html_container
         * @param {string} html_element
         * @return {string}
         */
        var append = function(html_container, html_element) {
            var pos = html_container.search(/(</[^>]+>s*)$/);
            return html_container.substring(0, pos) + html_element + html_container.substring(pos);
        };
    
        this.setup = (function() {
            var original = self.setup;
            return function() {
                // override the item rendering method to add the button to each
                if (options.append) {
                    var render_item = self.settings.render.item;
                    self.settings.render.item = function(data) {
                        return append(render_item.apply(this, arguments), html);
                    };
                }
    
                original.apply(this, arguments);
    
                // add event listener
                this.$control.on('click', '.' + options.className, function(e) {
                    e.preventDefault();
                    if (self.isLocked) return;
    
                    var $item = $(e.target).parent();
                    self.setActiveItem($item);
                    if (self.deleteSelection()) {
                        self.setCaret(self.items.length);
                    }
                });
    
            };
        })();
    
    });
    
    Selectize.define('restore_on_backspace', function(options) {
        var self = this;
    
        options.text = options.text || function(option) {
            return option[this.settings.labelField];
        };
    
        this.onKeyDown = (function(e) {
            var original = self.onKeyDown;
            return function(e) {
                var index, option;
                if (e.keyCode === KEY_BACKSPACE && this.$control_input.val() === '' && !this.$activeItems.length) {
                    index = this.caretPos - 1;
                    if (index >= 0 && index < this.items.length) {
                        option = this.options[this.items[index]];
                        if (this.deleteSelection(e)) {
                            this.setTextboxValue(options.text.apply(this, [option]));
                            this.refreshOptions(true);
                        }
                        e.preventDefault();
                        return;
                    }
                }
                return original.apply(this, arguments);
            };
        })();
    });

    return Selectize;
}));

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原文地址：https://www.cnblogs.com/aimyfly/p/3406794.html