ExtJs4 下拉框联动

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/*** @class Ext.app.AdSiteGrid* @extends Ext.grid.GridPanel* 内容项Add*/Ext.define('ctiWsSort', {    extend: 'Ext.data.Model',    fields: [            { type: 'string', name: 'Id' },            { type: 'string', name: 'Name' }           ]    });              wsStore = Ext.create('Ext.data.Store', {                model: 'ctiWsSort',                proxy:                 {                     type: 'ajax',                     url: 'Data/WebServiceComboxData.json',                     reader: { type: 'json', root: 'data' },                     fields: ['Id', 'Name']                 },                listeners:                    {                        'load': function (me, record, successful) {                            if (successful) {                                var combSort = Ext.getCmp('ctcEditTableName');                                combSort.setValue(combSort.getValue());                            }                        }                    },                autoLoad: true            });                    {                        xtype: 'combo',                        fieldLabel: 'Web Service接口',                        allowBlank: false,                        blankText: "此项不能为空",                        id: 'ctiEidtWebServie',                        name: 'wsName',                        typeAhead: true,                        displayField: "text",                        valueField: "value",                        queryMode: 'local',                        store: new Ext.data.SimpleStore({                            fields: ["text", "value"],                            data: [["热点新闻接口", "1"], ["产品库存接口", "2"], ["新闻维护接口", "3"]]                        }),                        listeners: {                            "select": function (combo, record, index) {                                alert(combo.value);                                wsStore.proxy.url = 'Data/WebServiceComboxData2.json';                                wsStore.load();                            }                        }                    },                    {                        xtype: 'combo',                        fieldLabel: "数据库表名",                        blankText: "此项不能为空",                        allowBlank: false,                        id: "ctcEditTableName",                        name: "TableName",                        displayField: "Name",                        valueField: "Id",                        queryMode: 'local',                        typeAhead: true,                        store: wsStore                    }