ExtJS 设置级联菜单的默认值

<script type="text/javascript">
//
function ExtStore(url)
{
return new Ext.data.Store({
proxy: new Ext.data.HttpProxy({
url: url
}),
reader: new Ext.data.JsonReader({
totalProperty: 'count',
root: 'result'
},
[
{ name: 'Id' },
{ name: 'Name' }
])
});
}

Ext.onReady(function() {
Ext.QuickTips.init();
Ext.form.Field.prototype.msgTarget = 'side';

var store1 = ExtStore('combox.aspx?method=GetProvinces');
var store2 = ExtStore('combox.aspx?method=GetCitys');

var combo2 = ComboBox('combo2','二级菜单',store2);
var combo1 = new Ext.form.ComboBox({
mode: 'remote',
fieldLabel:'一级菜单',
name:'combo1',
editable : false,
typeAhead: true,
triggerAction: 'all',
displayField:'Name',
valueField:'Id',
selectOnFocus:true,
store:store1,
listeners: {
'select': function(combo, record){
var id = record.get('Id');
if(id)
{
//清空二级菜单选项
combo2.setRawValue('');
store2.proxy = new Ext.data.HttpProxy({
url:String.format('combox.aspx?method=GetCitys&Province={0}',id)
});
store2.load();
}
}
}
});

var form1 = new Ext.FormPanel({
layout: 'form',
autoHeight: true,
frame: true,
renderTo: Ext.getBody(),
title: '<center style="curor:hand" onclick="window.location.reload();">表单控件</center>',
style: 'margin-left:auto;margin-right:auto;width:500px;margin-top:8px;',
//设置标签对齐方式
labelAlign: 'right',
//设置标签宽
labelWidth: 170,
//设置按钮的对齐方式
buttonAlign:'center',
//默认元素属性设置
defaults:{ width:180 },
items: [
combo1,
combo2
]
});

//加载数据
Ext.Ajax.request({
url: 'combox.aspx?method=Detail',
method: 'GET',
callback: function (options, success, response) {
if(success && response.status == 200){
//将值批量赋值
form1.form.setValues(Ext.util.JSON.decode(response.responseText))
}
}
});
});
</script>

static IList<Combox> Provinces = new List<Combox>();
static IDictionary<int, Combox> Citys = new Dictionary<int, Combox>();

static combox()
{
Provinces.Add(new Combox() { Id = 1, Name = "湖南省" });
Provinces.Add(new Combox() { Id = 2, Name = "广东省" });

Citys.Add(1, new Combox()
{
Id = 1,
Name = "长沙市"
});

Citys.Add(2, new Combox()
{
Id = 1,
Name = "岳阳市"
});

Citys.Add(3, new Combox()
{
Id = 2,
Name = "深圳市"
});

Citys.Add(4, new Combox()
{
Id = 2,
Name = "珠海市"
});
}

protected void Page_Load(object sender, EventArgs e)
{

}

/// <summary>
/// 获取所有省份数据
/// </summary>
/// <returns></returns>
public void GetProvinces()
{
Response.Write(new StringBuilder().Append("{count:")
.Append(Provinces.Count)
.Append(",result:")
.Append(JavaScriptConvert.SerializeObject(Provinces))
.Append('}')
.ToString());
}

/// <summary>
/// 获取省下面的市区数据
/// </summary>
/// <returns></returns>
public void GetCitys()
{
IList<Combox> result = new List<Combox>();
int Province = Convert.ToInt32(Request.QueryString["Province"]);
foreach (KeyValuePair<int, Combox> data in Citys)
{
if (data.Value.Id == Province)
result.Add(new Combox() { Id = data.Key, Name = data.Value.Name });

}
Response.Write(new StringBuilder().Append("{count:")
.Append(result.Count)
.Append(",result:")
.Append(JavaScriptConvert.SerializeObject(result))
.Append('}')
.ToString());
}

public override string Detail()
{
IDictionary<string, int> result = new Dictionary<string, int>();
result.Add("combo1", 2);
result.Add("combo2", 2);
return JavaScriptConvert.SerializeObject(result);
}

class Combox
{
public int Id { get; set; }
public string Name { get; set; }
}

store1.load();
//加载数据
Ext.Ajax.request({
url: 'combox.aspx?method=Detail',
method: 'GET',
callback: function (options, success, response) {
if(success && response.status == 200){
//将值批量赋值
form1.form.setValues(Ext.util.JSON.decode(response.responseText))
var comboValue1 = combo1.getValue();
var selectRecord;
store1.each(function(record){
if(record.data.Id == comboValue1)
selectRecord = record;
});
combo1.fireEvent('select',combo1,selectRecord);
}
}
});

store2.load({
callback :function(r,options,success){
if(success){
if(IsLoad)
{
combo2.setValue(comboValue2);
IsLoad = false;
}
}
}
});