/*******步骤有四个，缺一不可*********/


function () {xxxxxx = Ext.extend(construct, {InitControl: function () { var _this = this;/*****************步骤一：建数据store  ******************///一级下拉框数据（此处注意，一定要把store写在combobox控件定义的前面，否则无法加载数据）

          var moduleStore = new Ext.data.Store({ 
              proxy: new Ext.data.HttpProxy({
    type: ‘ajax‘, url: ‘/xx//Getxx?c=‘ + (new Date()).toString(),
    extraParams: { dept_Id: comboboxOutdept.getValue() },     reader: {   root: ‘Rows‘, totalProperty: ‘Total‘, type: ‘json‘       }      }),  autoLoad: true,  fields: [‘ID‘, ‘NAME‘,‘CODE‘]    //后台返回的字段名  });

/***********步骤二：建combobox对象并绑定store  ********/

            //一级下拉框绑定数据            var moduleCombo = new Ext.form.field.ComboBox({                fieldLabel: "申请医院",                columnWidth: .271,  //调整下拉框宽度                labelAlign: ‘right‘,                labelWidth: 60,                id: this.namespace + ‘_orgNameCombo‘,                store: moduleStore,   //绑定数据store                editable: false,                displayField: "NAME",                valueField: "ID",                emptyText: "--请选择医院--",                queryMode: "local",                style: ‘padding-top:20px;margin-left:30px;‘,                               listeners: {                    ‘select‘: function () {
                        //级联下拉框                        comboboxdept.setValue(‘‘);                        deptStore.load({ url: ‘/xx/GetDepts?c=‘ + 
              (new Date()).toString() + ‘&orgId=‘ + moduleCombo.getValue() });                    }                }            });            //二级下拉框数据            var deptStore = new Ext.data.Store({                proxy: new Ext.data.HttpProxy({                    type: ‘ajax‘,                    url: ‘/xx/GetDepts?c=‘ + (new Date()).toString(),                                        reader: {                        root: ‘Rows‘, totalProperty: ‘Total‘, type: ‘json‘                    }                }),                fields: [‘ID‘, ‘CODE‘, ‘NAME‘]            });            //二级下拉框绑定数据            var comboboxdept = new Ext.form.ComboBox({                xtype: "combobox",                name: "Gender",                fieldLabel: "申请科室",                columnWidth: .271,  //调整下拉框宽度                labelAlign: ‘right‘,                labelWidth: 60,                id: this.namespace + ‘_deptCombo‘,                store: deptStore,  //绑定数据store                editable: false,                displayField: "NAME",                valueField: "CODE",                emptyText: "--请选择科室--",                queryMode: "local",                style: ‘padding-top:20px;margin-left:30px;‘            });

//接上面同级

/**********步骤三：创建panel并将combobox控件绑定到界面****************/

this.bodyPanel = new Ext.Panel({
layout: ‘border‘,
bodyStyle: ‘padding:1px;‘,
defaults: { minHeight: 25, style: ‘padding-top:1px;‘ },
items: [
{

xtype: ‘panel‘, layout: ‘column‘, style: ‘padding-left:2px;‘,

   columnWidth: 1, region: ‘center‘, items: [
{
xtype: ‘panel‘, layout: ‘column‘, style: ‘padding-left:2px;‘,

     id: this.namespace + ‘_downLoadReferralRecord_first‘, columnWidth: 1, items: [
{

xtype: ‘textfield‘, fieldLabel: ‘身份证号‘, labelWidth: 65, id: this.namespace + ‘_idno‘,
height: 25, emptyText: ‘请输入身份证号‘, labelAlign: ‘right‘, columnWidth: .3, style: ‘padding-top:10px;‘
},

//或者直接扔combox进去

moduleCombo ,

comboboxdept

//换行写法，该写法会换行

{ xtype: ‘label‘, columnWidth: .5, text: ‘‘ },
{ xtype: ‘label‘, columnWidth: 1, height: 0, text: ‘‘, style: ‘font-size:2px;‘ }

]},

。。。

/***********步骤四：触发store数据加载  *****************/

在 panel下的params，隔壁加个监听事件

],
listeners: {
render: function () {
//加载时的遮罩层
_this.mask = new Ext.LoadMask(_this.bodyPanel.getEl(), ‘数据交互中...‘);
_this.moduleStore.load();
_this.deptStore.load();
}
}

/**********步骤四：赋值store数据  ************/

在InitControl最后一个项加

Ext.apply(this, {
grid: grid, //列表对象
store: store,
moduleStore: moduleStore,  //不加的话会导致数据不会到后台去读取
deptStore: deptStore
});
}

,