个人认为，XTemplate是ExtJs中最灵活的用来显示数据的组件，有点类似aspx中的Repeater控件，显示数据的模板完全可以由用户以html方式来定制.
先给一个官方的静态示例(稍微改了下)，代码并不复杂，关键的地方，我已经注释了
1
<
script type
=
"
text/javascript
"
>
2
Ext.onReady(
function
()
{
3
4
var data = {
5 name: 'Jack Slocum',
6 title: 'Lead Developer',
7 company: 'Ext JS, LLC',
8 email: 'jack@extjs.com',
9 address: '4 Red Bulls Drive',
10 city: 'Cleveland',
11 state: 'Ohio',
12 zip: '44102',
13 drinks: ['Red Bull', 'Coffee', 'Water'],
14 kids: [
15 { name: 'Sara Grace', age: 3 },
16 { name: 'Zachary', age: 2 },
17 { name: 'John James', age: 0 }
18]
19
};
20
21 var tpl = new Ext.XTemplate(
22'<p>Name: {name}</p>',
23'<p>Title: {title}</p>',
24'<p>Company: {company}</p>',
25'<p>[Kids:] ',
26'<tpl for="kids">',//表明这里循环读取kids节的数据
27'<p> {name}</p>',
28'</tpl></p>',
29'<p>[Drinks:] ',
30'<tpl for="drinks">',
31'<p> {#}.{.}</p>', //表明这里循环读取drinks节的数据,当数据没有属性名称时，用"."代表数据
32'</tpl></p>'
33);
34 tpl.overwrite(Ext.getBody(), data);
35
36
}
);
37
<
/
script>
运行结果图:
接下来我们看看如何跟服务器端的WCF做交互
１.首先定义一个用于信息传输的实体类(实际开发中，可以是任何可序列化的class,包括linq to sql生成的类)
Code
using System.Collections.Generic;
using System.Runtime.Serialization;
namespace Ajax_WCF
{
[DataContract]
public class Person
{
[DataMember]
public string name { set; get; }
[DataMember]
public string title { set; get; }
[DataMember]
public string company { set; get; }
[DataMember]
public string email { set; get; }
[DataMember]
public string address { set; get; }
[DataMember]
public string city { set; get; }
[DataMember]
public string state { set; get; }
[DataMember]
public string zip { set; get; }
[DataMember]
public List<AbstractData> drinks { set; get; }
[DataMember]
public List<KidData> kids { set; get; }
}
[DataContract]
public class AbstractData
{
[DataMember]
public string name { set; get; }
}
[DataContract]
public class KidData : AbstractData
{
[DataMember]
public int age { set; get; }
}
}
2.新建一个"启用了Ajax的WCF服务"
a.同时将svc手动修改一下，注意下面的高亮部分要手动加上去:
<%@ ServiceHost Language="C#" Debug="true" Service="Ajax_WCF.MyService" CodeBehind="MyService.svc.cs" Factory="System.ServiceModel.Activation.WebServiceHostFactory"%>
b.web.config中，也参考下面修改
<behavior name="Ajax_WCF.MyServiceAspNetAjaxBehavior">
<webHttp />
<!--<enableWebScript/>-->
</behavior>
c.在wcf中增加一个方法，代码如下:
Code
[OperationContract]
[WebInvoke(ResponseFormat = WebMessageFormat.Json, UriTemplate = "GetPerson", Method = "*")]
public Person GetPerson() {
System.Threading.Thread.Sleep(3000);//为演示loading效果，停3秒
return new Person() {
name = "Jack Slocum",
title = "Lead Developer",
company = "Ext JS, LLC",
email = "jack@extjs.com",
address = "4 Red Bulls Drive",
city = "Cleveland",
state = "Ohio",
zip = "44102",
drinks = new List<AbstractData> {
new AbstractData(){name="Red Bull"},
new AbstractData(){name="Coffee"},
new AbstractData(){name="Water"}
},
kids = new List<KidData> {
new KidData(){name="Red Bull",age=3},
new KidData(){name="Coffee",age=2},
new KidData(){name="Water",age=0}
}
};
}
这里为了简单起见，直接new并初始化了一个Person对象，然后返回为JSON格式
3.最后修改一下前面静态页的代码，完整页面代码如下:
Code
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head >
<title>XTemplate示例</title>
<link rel="stylesheet" type="text/css" href="js/ext2.2/resources/css/ext-all.css"/>
<script type="text/javascript" src="js/ext2.2/adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="js/ext2.2/ext-all.js"></script>
<style type="text/css">
body{font-size:9pt;padding:20px;}
.red{color:red;}
h1{padding-bottom:10px;}
</style>
</head>
<body>
<script type="text/javascript">
Ext.onReady(function() {
var tpl = new Ext.XTemplate(
'<p>Name: {name}</p>',
'<p>Title: {title}</p>',
'<p>Company: {company}</p>',
'<p>[Kids:] ',
'<tpl for="kids">',
'<p> {name}</p>',
'</tpl></p>',
'<p>[Drinks:] ',
'<tpl for="drinks">',
'<p> {#}.{name}</p>',
'</tpl></p>'
);
var demo = Ext.get("demo");
demo.dom.innerHTML = "数据加载中，请稍候";
demo.dom.className = "red";
Ext.Ajax.request({
url: "MyService.svc/GetPerson",
method: "GET",
success: function(request) {
demo.dom.className = "";
var data = Ext.util.JSON.decode(request.responseText);
tpl.overwrite("demo", data);
},
failure: function() {
alert("failure!");
}
});
});
</script>
<h1>XTemplate 示例</h1>
<div id="demo" style="border:1px solid #ccc;padding:10px;width:300px"></div>
</body>
</html>
解释一下:利用ExtJs的Ajax对象，请求MyServices.svc/GetPerson方法，获取Json字符串，其它地方完全一样，需要注意的是:
a.返回的字符串，需要用Ext.Util.JSON.decode转换成JSON对象
b.为了显示出loading加载效果，在调用Ajax的Request之前，用demo.com.innerHTML和demo.com.className先把目标div设置成"加载中"的字样
运行效果如下：
转载请注明来自"菩提树下的杨过"http://www.cnblogs.com/yjmyzz/archive/2008/09/09/1287767.html
这回运行时，增加了"数据加载中"的效果，加载成功后与刚才的静态示例显示结果完全相同
