ASP.NET中用AJAX实现无刷新求和~!!~~~~~~~

 第一次用AJAX,在网上找了个例子.调试不出来,各位帮帮忙~~~ Default.aspx:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><!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 runat="server">
    <title>无标题页</title>
        <script type="text/javascript" language="javascript">          var xmlHttp;
    function createXMLHttpRequst() {
        try {
            xmlHttp = new XMLHttpRequest();
            } catch (trymicrosoft) {
        try {
            xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (othermicrosoft) {
        try {
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (failed) {
             xmlHttp = false;
            }
  }
        function addNumber()
        {
            createXMLHttpRequst();
            var url = "Handler.ashx?num1="+document.getElementById("num1").value+"&num2="+document.getElementById("num2").value;
            xmlHttp.open("GET",url,true);
            xmlHttp.onreadystatechange=showResult;
            xmlHttp.send(null);
        }
        function showResult()
        {
   
            if(xmlHttp.readyState==4)
            {
                if(xmlHttp.status==200)
                {
                    document.getElementById("result").value=xmlHttp.responseText;
                }
            }
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <input id="num1" type="text" style="width:98px" onkeyup="addNumber();" value="0"/>+<input id="num2" type="text" style="width:98px" onkeyup="addNumber();"  value="0"/>=
        <input id="result" style="width:98px" type="text" />
    </div>
    </form>
</body>
</html>
Handler.ashx<%@ WebHandler Language="C#" Class="Handler" %>using System;
using System.Web;
using System.Data;
using System.Data.SqlClient;public class Handler : IHttpHandler {
    
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        int result = Convert.ToInt32(context.Request.QueryString["num1"]) + Convert.ToInt32(context.Request.QueryString["num2"]);
        context.Response.Write(result);
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }}
麻烦各位帮忙看看问题在哪??谢谢先>>>

解决方案 »

  1.   

    Handler 这个你跟踪了没有,有没有真的请求呢.如果没有到断点,则表示你的JS有问题.
      

  2.   

    楼主建立连接时错误，试试修改 function createXMLHttpRequst()
            {
            xmlHttp = false;
                try 
                {
                    xmlHttp = new XMLHttpRequest();
                } 
                catch (trymicrosoft) 
                {
                    try 
                    {
                        xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
                    } 
                    catch (othermicrosoft) 
                    {
                        try 
                        {
                            xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
                        } 
                        catch (failed) 
                        {
                            xmlHttp = false;
                        }  
                    }
                }
                if (!xmlHttp)
                {
                    alert("初始化XMLHttpRequest失败!");
                }
            }
      

  3.   

    呵呵，多谢谢symbol441 用你的OK拉..散分~!~