Ajax 调用 WebService 简单例子
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
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下面是一个完整的实例
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ajax_service.cs (webService文件Ajax_Service.asmx的后台)
1using System;
2using System.Web;
3using System.Collections;
4using System.Web.Services;
5using System.Web.Services.Protocols;
6
7
8/**//// <summary>
9/// Ajax_Service 的摘要说明
10/// </summary>
11
12
13public 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
22 public string HelloWorld() {
23 return "Hello World";
24 }
25
26
27 /**//*
28 返回a+b的和
29 */
30
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" %>
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 try
22 {
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').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"/>
86
87 <label id="lblResult"></label>
88 </div>
89 </form>
90</body>
91</html>
原文出处：http://www.evget.com/zh-CN/Info/ReadInfo.aspx?id=9112
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