XMLHttpRequest对象的属性:
onreadystatechange 指定当readyState属性改变时的事件处理
readystate 返回当前请求的状态
responseBody 以unsigned byte数组形式返回
responseStream 以Ado Stream对象的形式返回
responseText 作为字符串返回
responseXML 将响应的信息格式为Xml Document对象返回
status 当前请求的HTTP状态码
statusText 返回当前请求的响应行状态
XMLHttpRequest对象的方法:
abort
getAllResponseHeaders
getResponseHeader
open
send
setRequestHeader
===========================================================
下面是一个完整的实例
===========================================================
ajax_service.cs (webService文件Ajax_Service.asmx的后台)
前台文件:Ajax_Service.aspx
onreadystatechange 指定当readyState属性改变时的事件处理
readystate 返回当前请求的状态
responseBody 以unsigned byte数组形式返回
responseStream 以Ado Stream对象的形式返回
responseText 作为字符串返回
responseXML 将响应的信息格式为Xml Document对象返回
status 当前请求的HTTP状态码
statusText 返回当前请求的响应行状态
XMLHttpRequest对象的方法:
abort
getAllResponseHeaders
getResponseHeader
open
send
setRequestHeader
===========================================================
下面是一个完整的实例
===========================================================
ajax_service.cs (webService文件Ajax_Service.asmx的后台)
1
using System;
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using System.Web;
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using System.Collections;
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using System.Web.Services;
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using System.Web.Services.Protocols;
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7
8
/// <summary>
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/// Ajax_Service 的摘要说明
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/// </summary>
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[WebService(Namespace = "http://tempuri.org/")]
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[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
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public class Ajax_Service : System.Web.Services.WebService {
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public Ajax_Service () {
16
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//如果使用设计的组件,请取消注释以下行
18
//InitializeComponent();
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}
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[WebMethod]
22
public string HelloWorld() {
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return "Hello World";
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}
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26
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/*
28
返回a+b的和
29
*/
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[WebMethod]
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public int Sum(int a,int b)
32
{
33
return a + b;
34
}
35
36
}
37
38
using System;2
using System.Web;3
using System.Collections;4
using System.Web.Services;5
using System.Web.Services.Protocols;6

7

8
/// <summary>9
/// Ajax_Service 的摘要说明10
/// </summary>11
[WebService(Namespace = "http://tempuri.org/")]12
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]13
public class Ajax_Service : System.Web.Services.WebService {14

15
public Ajax_Service () {16

17
//如果使用设计的组件,请取消注释以下行 18
//InitializeComponent(); 19
}20

21
[WebMethod]22
public string HelloWorld() {23
return "Hello World";24
}25

26

27
/*28
返回a+b的和29
*/30
[WebMethod]31
public int Sum(int a,int b)32
{33
return a + b;34
}35
36
}37

38

前台文件:Ajax_Service.aspx
1
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Ajax_Service.aspx.cs" Inherits="Ajax_Service" %>
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3
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" >
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<head runat="server">
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<title>Ajax_WebService</title>
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<script type="text/javascript">
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var xmlhttp;
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function createXmlhttp()
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{
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if(window.XMLHttpRequest)
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{
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xmlhttp = new XMLHttpRequest();
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}
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else if(window.ActiveXObject)
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{
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try
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{
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xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
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}
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catch(e)
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{
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xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
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}
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}
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if(!xmlhttp)
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{
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alert('您的浏览器不支持XMLHttpRequest');
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}
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return xmlhttp;
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}
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function SumIt()
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{
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createXmlhttp();
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var url = "http://localhost:8051/Ajax_Service.asmx/Sum";
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var queryString = createQueryString();
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xmlhttp.open("POST",url,true);
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xmlhttp.onreadystatechange = handleStateChange;
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xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded;");
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xmlhttp.send(queryString);
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}
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function createQueryString()
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{
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var a = document.getElementById('txbA').value;
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var b = document.getElementById('txbB').value;
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var queryString = 'a='+a+'&b='+b;
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return queryString;
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}
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function handleStateChange()
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{
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if(xmlhttp.readyState == 4)
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{
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if(xmlhttp.status == 200)
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{
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displayResult();
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}
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}
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}
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function displayResult()
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{
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var result = document.getElementById('lblResult');
72
result.innerText = '计算结果:' + xmlhttp.responseXML.getElementsByTagName('int')[0].firstChild.data;
73
74
}
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76
</script>
77
78
</head>
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<body>
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<form id="form1" runat="server">
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<div>
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<input type="text" id="txbA" />
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<input type="text" id="txbB" />
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<input type="button" id="btm" value="计算" onclick="SumIt();" />
86
87
<label id="lblResult"></label>
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</div>
89
</form>
90
</body>
91
</html>
92
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Ajax_Service.aspx.cs" Inherits="Ajax_Service" %>2

3
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">4

5
<html xmlns="http://www.w3.org/1999/xhtml" >6
<head runat="server">7
<title>Ajax_WebService</title>8
9
<script type="text/javascript">10
11
var xmlhttp;12
13
function createXmlhttp()14
{15
if(window.XMLHttpRequest)16
{17
xmlhttp = new XMLHttpRequest();18
}19
else if(window.ActiveXObject)20
{21
try22
{23
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");24
}25
catch(e)26
{27
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");28
}29
}30
31
if(!xmlhttp)32
{33
alert('您的浏览器不支持XMLHttpRequest');34
}35
return xmlhttp; 36
}37
38
function SumIt()39
{40
createXmlhttp();41
var url = "http://localhost:8051/Ajax_Service.asmx/Sum";42
var queryString = createQueryString();43
xmlhttp.open("POST",url,true);44
xmlhttp.onreadystatechange = handleStateChange;45
xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded;");46
xmlhttp.send(queryString);47
}48
49
50
function createQueryString()51
{52
var a = document.getElementById('txbA').value;53
var b = document.getElementById('txbB').value;54
var queryString = 'a='+a+'&b='+b;55
return queryString;56
}57
58
function handleStateChange()59
{60
if(xmlhttp.readyState == 4)61
{62
if(xmlhttp.status == 200)63
{64
displayResult();65
}66
}67
}68
69
function displayResult()70
{71
var result = document.getElementById('lblResult');72
result.innerText = '计算结果:' + xmlhttp.responseXML.getElementsByTagName('int')[0].firstChild.data;73
74
}75
76
</script>77
78
</head>79
<body>80
<form id="form1" runat="server">81
<div>82
83
<input type="text" id="txbA" />84
<input type="text" id="txbB" />85
<input type="button" id="btm" value="计算" onclick="SumIt();" />86
87
<label id="lblResult"></label> 88
</div>89
</form>90
</body>91
</html>92



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