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({
                             width: 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);