解决easy ui两次请求服务器的问题

目前该问题已经在1.4.1版本中解决了

本文引用自：http://www.cnblogs.com/Reaver/p/4056770.html，原文博主：flyreaver

我在使用过程中遇到了easy ui1.4版本的一个问题，使用datagrid的时候当请求数据为0条时，会重新请求一次后台。上面这位兄弟帮我解决了这个问题，表示感谢。

为了防止原文丢失，作此备份：

easyui datagrid 1.4 当total为0时，请求两次url问题

框架问题：需要在easyui文件后加修补补丁

/**
* The Patch for jQuery EasyUI 1.4
*/
(function($){
    var plugin = $.fn._size;
    $.fn._size = function(options, parent){
        if (typeof options != 'string'){
            return this.each(function(){
                parent = parent || $(this).parent();
                if (parent.length){
                    plugin.call($(this), options, parent);
                }
            });
        } else if (options == 'unfit'){
            return this.each(function(){
                var p = $(this).parent();
                if (p.length){
                    plugin.call($(this), options, parent);
                }
            });
        } else {
            return plugin.call(this, options, parent);
        }
    };
})(jQuery);
(function($){
 $.map(['validatebox','textbox','filebox','searchbox',
            'combo','combobox','combogrid','combotree',
            'datebox','datetimebox','numberbox',
            'spinner','numberspinner','timespinner','datetimespinner'], function(plugin){
        if ($.fn[plugin]){
            if ($.fn[plugin].defaults.events){
                $.fn[plugin].defaults.events.click = function(e){
                    if (!$(e.data.target).is(':focus')){
                        $(e.data.target).trigger('focus');
                    }
                };
            }
        }
    });
    $.fn.combogrid.defaults.height = 22;
 $(function(){
        $(document).bind('mousewheel.combo', function(e){
            $(e.target).trigger('mousedown.combo');
        });
    });
})(jQuery);
(function($){
 $.extend($.fn.form.methods, {
     clear: function(jq){
         return jq.each(function(){
             var target = this;
             $('input,select,textarea', target).each(function(){
                    var t = this.type, tag = this.tagName.toLowerCase();
                    if (t == 'text' || t == 'hidden' || t == 'password' || tag == 'textarea'){
                        this.value = '';
                    } else if (t == 'file'){
                        var file = $(this);
                        if (!file.hasClass('textbox-value')){
                            var newfile = file.clone().val('');
                            newfile.insertAfter(file);
                            if (file.data('validatebox')){
                                file.validatebox('destroy');
                                newfile.validatebox();
                            } else {
                                file.remove();
                            }
                        }
                    } else if (t == 'checkbox' || t == 'radio'){
                        this.checked = false;
                    } else if (tag == 'select'){
                        this.selectedIndex = -1;
                    }
                });
                var t = $(target);
             var plugins = ['textbox','combo','combobox','combotree','combogrid','slider'];
             for(var i=0; i<plugins.length; i++){
                 var plugin = plugins[i];
                 var r = t.find('.'+plugin+'-f');
                 if (r.length && r[plugin]){
                     r[plugin]('clear');
                 }
             }
             $(target).form('validate');
            });
        }
    });
})(jQuery);
(function($){
 function setSize(target, param){
     var opts = $.data(target, 'linkbutton').options;
        if (param){
            $.extend(opts, param);
        }
        if (opts.width || opts.height || opts.fit){
            var btn = $(target);
            var parent = btn.parent();
            var isVisible = btn.is(':visible');
            if (!isVisible){
                var spacer = $('<div style="display:none"></div>').insertBefore(target);
                var style = {
                    position: btn.css('position'),
                    display: btn.css('display'),
                    left: btn.css('left')
                };
                btn.appendTo('body');
                btn.css({
                    position:'absolute',
                    display:'inline-block',
                    left:-20000
                });
            }
            btn._size(opts, parent);
            var left = btn.find('.l-btn-left');
            left.css('margin-top', 0);
            left.css('margin-top', parseInt((btn.height()-left.height())/2)+'px');
            if (!isVisible){
                btn.insertAfter(spacer);
                btn.css(style);
                spacer.remove();
            }
        }
    }
    var plugin = $.fn.linkbutton;
 $.fn.linkbutton = function(options, param){
        if (typeof options != 'string'){
            return this.each(function(){
                plugin.call($(this), options, param);
                setSize(this);
            });
        } else {
            return plugin.call(this, options, param);
        }
    };
    $.fn.linkbutton.methods = plugin.methods;
 $.fn.linkbutton.defaults = plugin.defaults;
    $.fn.linkbutton.parseOptions = plugin.parseOptions;
 $.extend($.fn.linkbutton.methods, {
     resize: function(jq, param){
         return jq.each(function(){
             setSize(this, param);
         });
     }
 });
})(jQuery);
(function($){
    var plugin = $.fn.dialog;
    $.fn.dialog = function(options, param){
        var result = plugin.call(this, options, param);
        if (typeof options != 'string'){
            this.each(function(){
                var opts = $(this).panel('options');
                if (isNaN(parseInt(opts.height))){
                    $(this).css('height', '');
                }
                var onResize = opts.onResize;
                opts.onResize = function(w, h){
                    onResize.call(this, w, h);
                    if (isNaN(parseInt(opts.height))){
                        $(this).css('height', '');
                    }
                    var shadow = $.data(this, 'window').shadow;
                    if (shadow){
                        var cc = $(this).panel('panel');
                        shadow.css({
                             cc._outerWidth(),
                            height: cc._outerHeight()
                        });
                    }
                };
                if (opts.closed){
                    var pp = $(this).panel('panel');
                    pp.show();
                    $(this).panel('resize');
                    pp.hide();
                }
            });
        }
        return result;
    };
    $.fn.dialog.methods = plugin.methods;
    $.fn.dialog.parseOptions = plugin.parseOptions;
    $.fn.dialog.defaults = plugin.defaults;
})(jQuery);
(function($){
 function createTab(container, pp, options) {
     var state = $.data(container, 'tabs');
        options = options || {};
        // create panel
        pp.panel({
            border: false,
            noheader: true,
            closed: true,
            doSize: false,
            iconCls: (options.icon ? options.icon : undefined)
        });
        var opts = pp.panel('options');
        $.extend(opts, options, {
         onLoad: function(){
             if (options.onLoad){
                 options.onLoad.call(this, arguments);
             }
             state.options.onLoad.call(container, $(this));
            }
        });
        var tabs = $(container).children('div.tabs-header').find('ul.tabs');
     opts.tab = $('<li></li>').appendTo(tabs);  // set the tab object in panel options
        opts.tab.append(
                '<a href="javascript:void(0)" class="tabs-inner">' +
                '<span class="tabs-title"></span>' +
                '<span class="tabs-icon"></span>' +
                '</a>'
        );
        $(container).tabs('update', {
         tab: pp,
         options: opts
     });
 }
 function addTab(container, options) {
     var opts = $.data(container, 'tabs').options;
        var tabs = $.data(container, 'tabs').tabs;
     if (options.selected == undefined) options.selected = true;
     var pp = $('<div></div>').appendTo($(container).children('div.tabs-panels'));
     tabs.push(pp);
     createTab(container, pp, options);
     opts.onAdd.call(container, options.title, tabs.length-1);
     $(container).tabs('resize');
        if (options.selected){
            $(container).tabs('select', tabs.length-1);
        }
    }
    $.extend($.fn.tabs.methods, {
        add: function(jq, options){
            return jq.each(function(){
                addTab(this, options);
            });
        }
    });
})(jQuery);
(function($){
 $.extend($.fn.menubutton.methods, {
     enable: function(jq){
         return jq.each(function(){
             $(this).data('menubutton').options.disabled = false;
                $(this).linkbutton('enable');
         });
     }
 });
})(jQuery);
(function($){
    var onAfterRender = $.fn.datagrid.defaults.view.onAfterRender;
    $.extend($.fn.datagrid.defaults.view, {
        updateRow: function(target, rowIndex, row){
            var opts = $.data(target, 'datagrid').options;
            var rows = $(target).datagrid('getRows');
            var oldStyle = _getRowStyle(rowIndex);
            $.extend(rows[rowIndex], row);
            var newStyle = _getRowStyle(rowIndex);
            var oldClassValue = oldStyle.c;
            var styleValue = newStyle.s;
            var classValue = 'datagrid-row ' + (rowIndex % 2 && opts.striped ? 'datagrid-row-alt ' : ' ') + newStyle.c;
            function _getRowStyle(rowIndex){
                var css = opts.rowStyler ? opts.rowStyler.call(target, rowIndex, rows[rowIndex]) : '';
                var classValue = '';
                var styleValue = '';
                if (typeof css == 'string'){
                    styleValue = css;
                } else if (css){
                    classValue = css['class'] || '';
                    styleValue = css['style'] || '';
                }
                return {c:classValue, s:styleValue};
            }
            function _update(frozen){
                var fields = $(target).datagrid('getColumnFields', frozen);
                var tr = opts.finder.getTr(target, rowIndex, 'body', (frozen?1:2));
                var checked = tr.find('div.datagrid-cell-check input[type=checkbox]').is(':checked');
                tr.html(this.renderRow.call(this, target, fields, frozen, rowIndex, rows[rowIndex]));
                tr.attr('style', styleValue).removeClass(oldClassValue).addClass(classValue);
                if (checked){
                    tr.find('div.datagrid-cell-check input[type=checkbox]')._propAttr('checked', true);
                }
            }
            _update.call(this, true);
            _update.call(this, false);
            $(target).datagrid('fixRowHeight', rowIndex);
        },
        onAfterRender: function(target){
            onAfterRender.call($.fn.datagrid.defaults.view, target);
            setTimeout(function(){
                var opts = $(target).datagrid('options');
                opts.pageNumber = opts.pageNumber || 1;
            },0);
        }
    });
    $.fn.datagrid.defaults.loader = function(param, success, error){
        var opts = $(this).datagrid('options');
        if (!opts.url) return false;
        if (opts.pagination && opts.pageNumber == 0){
            opts.pageNumber = 1;
            param.page = 1;
        }
        if (param.page == 0){
            return false;
        }
        $.ajax({
            type: opts.method,
            url: opts.url,
            data: param,
            dataType: 'json',
            success: function(data){
                success(data);
            },
            error: function(){
                error.apply(this, arguments);
            }
        });
    };
})(jQuery);
(function($){
 $.fn.numberbox.defaults.filter = function(e){
        var opts = $(this).numberbox('options');
        var s = $(this).numberbox('getText');
     if (e.which == 45){    //-
         return (s.indexOf('-') == -1 ? true : false);
     }
     var c = String.fromCharCode(e.which);
     if (c == opts.decimalSeparator){
         return (s.indexOf(c) == -1 ? true : false);
     } else if (c == opts.groupSeparator){
         return true;
     } else if ((e.which >= 48 && e.which <= 57 && e.ctrlKey == false && e.shiftKey == false) || e.which == 0 || e.which == 8) {
         return true;
     } else if (e.ctrlKey == true && (e.which == 99 || e.which == 118)) {
         return true;
     } else {
         return false;
     }
 };
})(jQuery);