ExtJS中如何扩展自定义的类

 1/**//**
 2 * ExtJs自定义PersonListGridPanel类
 3 * 该类继承自GridPanel[使用Ext.extend(superClass,override Object)方法实现继承],
 4 * 并override了该类的构造函数
 5 * 构造函数内部继承自GridPanel的构造函数[apply(this,arguments)实现继承]
 6 * 该类实现了如何对外部公布一个事件
 7 * 在构造函数中添加一个事件[this.addEvents("事件名称"）]
 8 * 然后使用this.fireEvent("事件名称",参数）来发布此事件
 9 * 最后在客户端调用的时候来订阅该事件
10 */
11PersonListGridPanel = Ext.extend(Ext.grid.GridPanel, {
12    constructor: function(_url){
13        PersonListGridPanel.superclass.constructor.apply(this, [{
14            renderTo: Ext.getBody(),
15            width: 350,
16            height: 200,
17            frame: true,
18            layout: "form",
19            tbar:[{
20                text:"add"
21            },"-",{
22                text:"update"
23            },"-",{
24                text:"delete"
25            }],
26            enableColumnMove: false,
27            columns: [{
28                header: "Name",
29                menuDisabled: true,
30                dataIndex: "name"
31            }, {
32                header: "Age",
33                menuDisabled: true,
34                dataIndex: "age"
35            }, {
36                header: "Sex",
37                menuDisabled: true,
38                dataIndex: "sex"
39            }],
40            store: new Ext.data.JsonStore({
41                autoLoad: true,
42                url: _url,
43                fields: ["name", "age", "sex"]
44            }),
45            
46            selModel: new Ext.grid.RowSelectionModel({
47                singleSelect: true,
48                listeners: {
49                    "rowselect": {
50                        fn: function(_sel, _index, _r){
51                            this.fireEvent("rowselect", _r);//发布事件
52                        },
53                        scope: this
54                    }
55                }
56            })
57        
58        }]);
59        this.addEvents("rowselect");//添加事件
60    }
61})
62

 1/**//**
 2 * 前端调用自定义类（组件）
 3 */
 4Ext.onReady(function(){
 5    var _grid=new PersonListGridPanel("http://localhost:3830/extjs/gridData.ashx");
 6    //以下订阅该事件
 7    _grid.on("rowselect", function(_r){
 8        this.getForm().loadRecord(_r);
 9    },_form);
10    
11});