Ext4.2+ Ext.grid.plugin.RowExpander存在bug，添加的collapsebody，expandbody无法触发，查看了下 Ext.grid.plugin.RowExpander对应的源代码，没有添加collapsebody，expandbody事件，即使按照网上的方 法重写Ext.grid.plugin.RowExpander的init和toggleRow方法也无法触发 collapsebody，expandbody事件。
解决办法：给grid对象添加collapsebody，expandbody事件，然后给grid配置这2个事件，同时重写Ext.grid.plugin.RowExpander的toggleRow方法，触发grid添加的这2个事件即可。
测试源代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>Ext4.2+ Ext.grid.plugin.RowExpander无法触发collapsebody，expandbody事件解决办法</title><link rel="stylesheet" type="text/css" href="../../resources/css/ext-all.css" rel="external nofollow" /><script type="text/javascript" src="../../ext-all-debug.js"> </script><script>Ext.override(Ext.grid.plugin.RowExpander, { // Override to fire collapsebody & expandbody init: function(grid) { this.callParent(arguments);// grid.getView().addEvents('collapsebody', 'expandbody');//ext论坛找到的解决办法，这样也无法添加事件//存储grid对象this.grid=grid this.grid.addEvents('collapsebody', 'expandbody');//给grid对象添加事件 }, toggleRow: function(rowIdx, record) { var me = this, view = me.view, rowNode = view.getNode(rowIdx), row = Ext.fly(rowNode, '_rowExpander'), nextBd = row.down(me.rowBodyTrSelector, true), isCollapsed = row.hasCls(me.rowCollapsedCls), addOrRemoveCls = isCollapsed ? 'removeCls' : 'addCls', ownerLock, rowHeight, fireView; // Suspend layouts because of possible TWO views having their height change Ext.suspendLayouts(); row[addOrRemoveCls](me.rowCollapsedCls); Ext.fly(nextBd)[addOrRemoveCls](me.rowBodyHiddenCls); me.recordsExpanded[record.internalId] = isCollapsed; view.refreshSize(); // Sync the height and class of the row on the locked side if (me.grid.ownerLockable) { ownerLock = me.grid.ownerLockable;// fireView = ownerLock.getView(); view = ownerLock.lockedGrid.view; fireView=ownerLock.lockedGrid.view; rowHeight = row.getHeight(); // EXTJSIV-9848: in Firefox the offsetHeight of a row may not match // it is actual rendered height due to sub-pixel rounding errors. To ensure // the rows heights on both sides of the grid are the same, we have to set // them both. row.setHeight(isCollapsed ? rowHeight : ''); row = Ext.fly(view.getNode(rowIdx), '_rowExpander'); row.setHeight(isCollapsed ? rowHeight : ''); row[addOrRemoveCls](me.rowCollapsedCls); view.refreshSize(); } else { fireView = view; }//通过grid触发事件，而不是viewthis.grid.fireEvent(isCollapsed ? 'expandbody' : 'collapsebody', row.dom, record, nextBd);//下面为ext论坛的解决办法，无效//fireView.fireEvent(isCollapsed ? 'expandbody' : 'collapsebody', row.dom, record, nextBd); // Coalesce laying out due to view size changes Ext.resumeLayouts(true); },});//Ext.loader.setConfig({enabled:true});Ext.onReady(function() { Ext.QuickTips.init(); var store = new Ext.data.Store({ fields:[ {name:'fileName',type:'string'}, {name:'room',type:'string'}, {name:'recordDate',type:'string'}, ], data:[ {fileName:'文件1',room:'会议室1',recordDate:'2014-07-03'}, {fileName:'文件2',room:'会议室2',recordDate:'2014-07-03'}, {fileName:'文件3',room:'会议室3',recordDate:'2014-07-03'} ], autoLoad:true }); var expander = new Ext.grid.plugin.RowExpander({ rowBodyTpl:new Ext.XTemplate('<div>pp</div>'), listeners:{ expandbody:function(){//无法触发这个是事件 console.log('Ext.grid.plugin.RowExpander'); } } }); Ext.create('Ext.grid.Panel',{ xtype: 'row-expander-grid', store: store, listeners:{ expandbody:function(){//OK，可以触发 console.log('fired from grid'); } }, renderTo:Ext.getBody(), columns: [ {text: "文件名称", flex: 1, dataIndex: 'fileName'}, {text: "会议室", dataIndex: 'room'}, {text: "录制日期", renderer: Ext.util.Format.dateRenderer('Y-m-d'), dataIndex: 'recordDate'} ], width: 600, height: 300, plugins:expander, collapsible: true, animCollapse: false, title: 'Expander Rows in a Collapsible Grid', iconCls: 'icon-grid' });});</script></head><body id="docbody"></body></html>