Ajax 调用 WebService 简单例子 -控件新闻-慧都网

Ajax 调用 WebService 简单例子

转帖|其它|编辑：郝浩|2008-12-04 11:31:18.000|阅读 2280 次

概述：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

===========================================================
下面是一个完整的实例
===========================================================
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[WebService(Namespace = "http://tempuri.org/")]
12[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
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    [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" %>
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')[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>