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  • 带搜索框的jQuery下拉框插件

    由于下拉框的条数有几十个，于是打算找一个可以搜索查找功能的下拉框，刚开始在网上看了几个，都是有浏览器兼容性问题，后来看到这个“带搜索框的jQuery下拉框美化插件 searchable”，看演示代码简单易用，支持多个浏览器。

    不过在使用过程中碰到了几个问题，先后解决了。

    1、多个下拉框放在一起会出现遮挡的问题，原文评论有个解决方法：
    在jquery.searchableSelect.js文件里面的代码里面加上下面2行带注释的代码

    show: function() {
    this.dropdown.removeClass('searchable-select-hide');
    this.input.focus();
    this.status = 'show';
    this.setPriviousAndNextVisibility();
    this.dropdown.css('z-index', 100); //打开下拉列表时调高z-index层级  
}, hide: function() {
    if (!(this.status === 'show')) return;
    if (this.items.find(':not(.searchable-select-hide)').length === 0) this.input.val('');
    this.dropdown.addClass('searchable-select-hide');
    this.searchableElement.trigger('focus');
    this.status = 'hide';
    this.dropdown.css('z-index', 1); //关闭下拉列表时恢复z-index层级  
},

    2、原文用的是jquery-1.11.1.min.js，但是整个项目用的是jquery-1.7.2.js，在chrome浏览器F12调试一加载页面会出现错误信息：
    Uncaught TypeError: $.expr.createPseudo is not a function
    $(...).searchableSelect is not a function
    点进去提示$.expr.createPseudo有语法错误
    猜测是jquery版本问题，果然，搜索了一下，$.expr.createPseudo是jquery1.8.1版本以上支持的。
    于是修改了下代码，把下面代码

    $.expr[":"].searchableSelectContains = $.expr.createPseudo(function(arg) {
  return function( elem ) {
    return $(elem).text().toUpperCase().indexOf(arg.toUpperCase()) >= 0;
  };
});

    修改为下面就解决：

    $.expr[":"].searchableSelectContains = function(obj,index,meta){	
	 return $(obj).text().toUpperCase().indexOf(meta[3].toUpperCase()) >= 0;
};

    3、第2个问题解决后，发现在删除搜索框文字为空时，chrome调试窗口有异常，并且下拉框不会恢复原来的下拉选项
    调试是下面这句代码有问题（如果是demo中的jquery-1.11.1.min.js版本，则不存在此问题）
    this.items.find('.searchable-select-item:searchableSelectContains('+text+')').removeClass('searchable-select-hide');
    解决方法是加一个是否为空的判断：

    if(text != ''){
	this.items.find('.searchable-select-item:searchableSelectContains('+text+')').removeClass('searchable-select-hide');
}else{
	this.items.find('.searchable-select-item').removeClass('searchable-select-hide'); 
 }

    4、把功能整合到项目时，发现下拉框里面的搜索框被拉长变形了，chromeF12调试窗口能看到搜索框的样式有删除线，即被优先级更高的样式替换了。
    解决方法是修改jquery.searchableSelect.css里面的样式，加一个!important提高优先级

    .searchable-select-input {
  margin-top: 5px;
  border: 1px solid #ccc!important;
  outline: none;
  padding: 4px;
   100%!important;
  box-sizing: border-box;  
}

    附，修改后的代码：

    demo.html

    <!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8">
    <title>带搜索框的jQuery下拉框美化插件 searchableSelect</title>
    <link href="jquery.searchableSelect.css" rel="stylesheet" type="text/css">
    <script src="jquery-1.7.2.js"></script>
    <script src="jquery.searchableSelect.js"></script>
  </head>
  <body>
    <select id="se1">
	  <option value="">请选择</option>
      <option value="jQuery插件库">jQuery插件库</option>
      <option value="BlackBerry">BlackBerry</option>
      <option value="device">device</option>
      <option value="with">with</option>
      <option value="entertainment">entertainment</option>
      <option value="and">and</option>
      <option value="social">social</option>
      <option value="networking">networking</option>
      <option value="apps">apps</option>
      <option value="or">or</option>
      <option value="apps">apps</option>
      <option value="that">that</option>
    </select>
    <input type="button" value="test" onclick="var v = $('#se1').val();alert(v);" />
    <script>
		$(function(){
			$('#se1').searchableSelect();			
		});
    </script>
  </body>
</html>

    jquery.searchableSelect.js

    // Author: David Qin
// E-mail: david@hereapp.cn
// Date: 2014-11-05

(function($){

   //jQuery1.8.1以上版本使用
  // a case insensitive jQuery :contains selector
  /*$.expr[":"].searchableSelectContains = $.expr.createPseudo(function(arg) {
    return function( elem ) {
      return $(elem).text().toUpperCase().indexOf(arg.toUpperCase()) >= 0;
    };
  });*/
  
  $.expr[":"].searchableSelectContains = function(obj,index,meta){	
	 return $(obj).text().toUpperCase().indexOf(meta[3].toUpperCase()) >= 0;
  };
  

  $.searchableSelect = function(element, options) {
    this.element = element;
    this.options = options || {};
    this.init();

    var _this = this;

    this.searchableElement.click(function(event){
      // event.stopPropagation();
      _this.show();
    }).on('keydown', function(event){
      if (event.which === 13 || event.which === 40 || event.which == 38){
        event.preventDefault();
        _this.show();
      }
    });

    $(document).on('click', null, function(event){
      if(_this.searchableElement.has($(event.target)).length === 0)
        _this.hide();
    });

    this.input.on('keydown', function(event){
      event.stopPropagation();
      if(event.which === 13){         //enter
        event.preventDefault();
        _this.selectCurrentHoverItem();
        _this.hide();
      } else if (event.which == 27) { //ese
        _this.hide();
      } else if (event.which == 40) { //down
        _this.hoverNextItem();
      } else if (event.which == 38) { //up
        _this.hoverPreviousItem();
      }
    }).on('keyup', function(event){
      if(event.which != 13 && event.which != 27 && event.which != 38 && event.which != 40)
        _this.filter();
    })
  }

  var $sS = $.searchableSelect;

  $sS.fn = $sS.prototype = {
    version: '0.0.1'
  };

  $sS.fn.extend = $sS.extend = $.extend;

  $sS.fn.extend({
    init: function(){
      var _this = this;
      this.element.hide();

      this.searchableElement = $('<div tabindex="0" class="searchable-select"></div>');
      this.holder = $('<div class="searchable-select-holder"></div>');
      this.dropdown = $('<div class="searchable-select-dropdown searchable-select-hide"></div>');
      this.input = $('<input type="text" class="searchable-select-input" />');
      this.items = $('<div class="searchable-select-items"></div>');
      this.caret = $('<span class="searchable-select-caret"></span>');

      this.scrollPart = $('<div class="searchable-scroll"></div>');
      this.hasPrivious = $('<div class="searchable-has-privious">...</div>');
      this.hasNext = $('<div class="searchable-has-next">...</div>');

      this.hasNext.on('mouseenter', function(){
        _this.hasNextTimer = null;

        var f = function(){
          var scrollTop = _this.items.scrollTop();
          _this.items.scrollTop(scrollTop + 20);
          _this.hasNextTimer = setTimeout(f, 50);
        }

        f();
      }).on('mouseleave', function(event) {
        clearTimeout(_this.hasNextTimer);
      });

      this.hasPrivious.on('mouseenter', function(){
        _this.hasPriviousTimer = null;

        var f = function(){
          var scrollTop = _this.items.scrollTop();
          _this.items.scrollTop(scrollTop - 20);
          _this.hasPriviousTimer = setTimeout(f, 50);
        }

        f();
      }).on('mouseleave', function(event) {
        clearTimeout(_this.hasPriviousTimer);
      });

      this.dropdown.append(this.input);
      this.dropdown.append(this.scrollPart);

      this.scrollPart.append(this.hasPrivious);
      this.scrollPart.append(this.items);
      this.scrollPart.append(this.hasNext);

      this.searchableElement.append(this.caret);
      this.searchableElement.append(this.holder);
      this.searchableElement.append(this.dropdown);
      this.element.after(this.searchableElement);

      this.buildItems();
      this.setPriviousAndNextVisibility();
    },

    filter: function(){
      var text = this.input.val();
      this.items.find('.searchable-select-item').addClass('searchable-select-hide');
	  if(text != ''){
		this.items.find('.searchable-select-item:searchableSelectContains('+text+')').removeClass('searchable-select-hide');
	  }else{
		this.items.find('.searchable-select-item').removeClass('searchable-select-hide'); 
	  }
      if(this.currentSelectedItem.hasClass('searchable-select-hide') && this.items.find('.searchable-select-item:not(.searchable-select-hide)').length > 0){
        this.hoverFirstNotHideItem();
      }

      this.setPriviousAndNextVisibility();
    },

    hoverFirstNotHideItem: function(){
      this.hoverItem(this.items.find('.searchable-select-item:not(.searchable-select-hide)').first());
    },

    selectCurrentHoverItem: function(){
      if(!this.currentHoverItem.hasClass('searchable-select-hide'))
        this.selectItem(this.currentHoverItem);
    },

    hoverPreviousItem: function(){
      if(!this.hasCurrentHoverItem())
        this.hoverFirstNotHideItem();
      else{
        var prevItem = this.currentHoverItem.prevAll('.searchable-select-item:not(.searchable-select-hide):first')
        if(prevItem.length > 0)
          this.hoverItem(prevItem);
      }
    },

    hoverNextItem: function(){
      if(!this.hasCurrentHoverItem())
        this.hoverFirstNotHideItem();
      else{
        var nextItem = this.currentHoverItem.nextAll('.searchable-select-item:not(.searchable-select-hide):first')
        if(nextItem.length > 0)
          this.hoverItem(nextItem);
      }
    },

    buildItems: function(){
      var _this = this;
      this.element.find('option').each(function(){
        var item = $('<div class="searchable-select-item" data-value="'+$(this).attr('value')+'">'+$(this).text()+'</div>');

        if(this.selected){
          _this.selectItem(item);
          _this.hoverItem(item);
        }

        item.on('mouseenter', function(){
          $(this).addClass('hover');
        }).on('mouseleave', function(){
          $(this).removeClass('hover');
        }).click(function(event){
          event.stopPropagation();
          _this.selectItem($(this));
          _this.hide();
        });

        _this.items.append(item);
      });

      this.items.on('scroll', function(){
        _this.setPriviousAndNextVisibility();
      })
    },
    show: function(){
      this.dropdown.removeClass('searchable-select-hide');
      this.input.focus();
      this.status = 'show';
      this.setPriviousAndNextVisibility();
      this.dropdown.css('z-index', 100); //打开下拉列表时调高z-index层级
    },

    hide: function(){
      if(!(this.status === 'show'))
        return;

      if(this.items.find(':not(.searchable-select-hide)').length === 0)
          this.input.val('');
      this.dropdown.addClass('searchable-select-hide');
      this.searchableElement.trigger('focus');
      this.status = 'hide';
      this.dropdown.css('z-index', 1); //关闭下拉列表时恢复z-index层级
    },

    hasCurrentSelectedItem: function(){
      return this.currentSelectedItem && this.currentSelectedItem.length > 0;
    },

    selectItem: function(item){
      if(this.hasCurrentSelectedItem())
        this.currentSelectedItem.removeClass('selected');

      this.currentSelectedItem = item;
      item.addClass('selected');

      this.hoverItem(item);

      this.holder.text(item.text());
      var value = item.data('value');
      this.holder.data('value', value);
      this.element.val(value);

      if(this.options.afterSelectItem){
        this.options.afterSelectItem.apply(this);
      }
    },

    hasCurrentHoverItem: function(){
      return this.currentHoverItem && this.currentHoverItem.length > 0;
    },

    hoverItem: function(item){
      if(this.hasCurrentHoverItem())
        this.currentHoverItem.removeClass('hover');

      if(item.outerHeight() + item.position().top > this.items.height())
        this.items.scrollTop(this.items.scrollTop() + item.outerHeight() + item.position().top - this.items.height());
      else if(item.position().top < 0)
        this.items.scrollTop(this.items.scrollTop() + item.position().top);

      this.currentHoverItem = item;
      item.addClass('hover');
    },

    setPriviousAndNextVisibility: function(){
      if(this.items.scrollTop() === 0){
        this.hasPrivious.addClass('searchable-select-hide');
        this.scrollPart.removeClass('has-privious');
      } else {
        this.hasPrivious.removeClass('searchable-select-hide');
        this.scrollPart.addClass('has-privious');
      }

      if(this.items.scrollTop() + this.items.innerHeight() >= this.items[0].scrollHeight){
        this.hasNext.addClass('searchable-select-hide');
        this.scrollPart.removeClass('has-next');
      } else {
        this.hasNext.removeClass('searchable-select-hide');
        this.scrollPart.addClass('has-next');
      }
    }
  });

  $.fn.searchableSelect = function(options){
    this.each(function(){
      var sS = new $sS($(this), options);
    });

    return this;
  };

})(jQuery);

    jquery.searchableSelect.css

    /*
Author: David Qin
E-mail: david@hereapp.cn
Date: 2014-11-05
*/

.searchable-select-hide {
  display: none;
}

.searchable-select {
  display: inline-block;
  min- 130px;
  font-size: 14px;
  line-height: 1.428571429;
  color: #555;
  vertical-align: middle;
  position: relative;
  outline: none;  
}

.searchable-select-holder{
  padding: 2px;
  background-color: #fff;
  background-image: none;
  border: 1px solid #ccc;
  border-radius: 2px;
  min-height: 30px;
  box-sizing: border-box;
  -webkit-box-shadow: inset 0 1px 1px rgba(0,0,0,0.075);
  box-shadow: inset 0 1px 1px rgba(0,0,0,0.075);
  -webkit-transition: border-color ease-in-out .15s,box-shadow ease-in-out .15s;
  transition: border-color ease-in-out .15s,box-shadow ease-in-out .15s;
}

.searchable-select-caret {
  position: absolute;
   0;
  height: 0;
  box-sizing: border-box;
  border-color: black transparent transparent transparent;
  top: 0;
  bottom: 0;
  border-style: solid;
  border- 5px;
  margin: auto;
  right: 10px;
}

.searchable-select-dropdown {
  position: absolute;
  background-color: #fff;
  border: 1px solid #ccc;
  border-bottom-left-radius: 4px;
  border-bottom-right-radius: 4px;
  padding: 4px;
  border-top: none;
  top: 28px;
  left: 0;
  right: 0;
}

.searchable-select-input {
  margin-top: 5px;
  border: 1px solid #ccc;
  outline: none;
  padding: 4px;
   100%;
  box-sizing: border-box;
   100%;
}

.searchable-scroll {
  margin-top: 4px;
  position: relative;
}

.searchable-scroll.has-privious {
  padding-top: 16px;
}

.searchable-scroll.has-next {
  padding-bottom: 16px;
}

.searchable-has-privious {
  top: 0;
}

.searchable-has-next {
  bottom: 0;
}

.searchable-has-privious, .searchable-has-next {
  height: 16px;
  left: 0;
  right: 0;
  position: absolute;
  text-align: center;
  z-index: 10;
  background-color: white;
  line-height: 8px;
  cursor: pointer;
}

.searchable-select-items {
  max-height: 400px;
  overflow-y: scroll;
  position: relative;
}

.searchable-select-items::-webkit-scrollbar {
  display: none;
}

.searchable-select-item {
  padding: 5px 5px;
  cursor: pointer;
  min-height: 30px;
  box-sizing: border-box;
    transition: all 1s ease 0s;
}

.searchable-select-item.hover {

  background: #555;
  color: white;
}

.searchable-select-item.selected {
  background: #28a4c9;
  color: white;
}

    　　
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  • 原文地址：https://www.cnblogs.com/gdjlc/p/7744157.html
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