ExtJs学习笔记(21)-使用XTemplate结合WCF显示数据
個(gè)人認(rèn)為，XTemplate是ExtJs中最靈活的用來顯示數(shù)據(jù)的組件，有點(diǎn)類似aspx中的Repeater控件，顯示數(shù)據(jù)的模板完全可以由用戶以html方式來定制.
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先給一個(gè)官方的靜態(tài)示例(稍微改了下)，代碼并不復(fù)雜，關(guān)鍵的地方，我已經(jīng)注釋了
?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">',//表明這里循環(huán)讀取kids節(jié)的數(shù)據(jù)
27'<p> {name}</p>',
28'</tpl></p>',
29'<p>[Drinks:]?',
30'<tpl?for="drinks">',
31'<p> {#}.{.}</p>',?//表明這里循環(huán)讀取drinks節(jié)的數(shù)據(jù),當(dāng)數(shù)據(jù)沒有屬性名稱時(shí)，用"."代表數(shù)據(jù)
32'</tpl></p>'
33);
34????????????tpl.overwrite(Ext.getBody(),?data);
35
36????????});
37????</script>???
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運(yùn)行結(jié)果圖:
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接下來我們看看如何跟服務(wù)器端的WCF做交互
１.首先定義一個(gè)用于信息傳輸?shù)膶?shí)體類(實(shí)際開發(fā)中，可以是任何可序列化的class,包括linq to sql生成的類)
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Codeusing 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.新建一個(gè)"啟用了Ajax的WCF服務(wù)"
a.同時(shí)將svc手動(dòng)修改一下，注意下面的高亮部分要手動(dòng)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，也參考下面修改
?<behavior name="Ajax_WCF.MyServiceAspNetAjaxBehavior">
????? <webHttp />
????? <!--<enableWebScript/>-->
??? </behavior>
c.在wcf中增加一個(gè)方法，代碼如下:
Code[OperationContract]
[WebInvoke(ResponseFormat = WebMessageFormat.Json, UriTemplate = "GetPerson", Method = "*")]
public Person GetPerson() {
System.Threading.Thread.Sleep(3000);//為演示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}
}
};
}
這里為了簡單起見，直接new并初始化了一個(gè)Person對象，然后返回為JSON格式
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3.最后修改一下前面靜態(tài)頁的代碼，完整頁面代碼如下:
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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 = "數(shù)據(jù)加載中，請稍候";
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>
解釋一下:利用ExtJs的Ajax對象，請求MyServices.svc/GetPerson方法，獲取Json字符串，其它地方完全一樣，需要注意的是:
a.返回的字符串，需要用Ext.Util.JSON.decode轉(zhuǎn)換成JSON對象
b.為了顯示出loading加載效果，在調(diào)用Ajax的Request之前，用demo.com.innerHTML和demo.com.className先把目標(biāo)div設(shè)置成"加載中"的字樣
運(yùn)行效果如下：
轉(zhuǎn)載請注明來自"菩提樹下的楊過"http://www.cnblogs.com/yjmyzz/archive/2008/09/09/1287767.html
這回運(yùn)行時(shí)，增加了"數(shù)據(jù)加載中"的效果，加載成功后與剛才的靜態(tài)示例顯示結(jié)果完全相同
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