extjs右键菜单

extjs中的gridpanel、TreePanel等控件都可以有右键菜单，如下设置。

listeners: {  
                render: function() {  
                        // After the component has been rendered, disable the default browser context menu  
                        Ext.getBody().on("contextmenu", Ext.emptyFn, null, {preventDefault: true});  
                },  
                contextmenu: function(e) {   //在gridpanel中可以使用rowcontextmenu事件
                    // Init your context menu  

                    this.cmenu = new Ext.menu.Menu({
                        items: [ {
                            text: 'Close Other'
                        }, {
                            text: 'Close All'
                        }]
                    })
                    e.stopEvent();
                    this.cmenu.showAt(e.getPoint());
                }
         }