刚学AJAX，问个简单的问题

百变猪娃娃 2012-04-22 01:54:30



<!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>无标题页</title>



    <script src="js/jquery-1.4.2.js" type="text/javascript"></script>

    <script type="text/javascript">

        function Button1_onclick(){

            var amount = $("#Text1").val();

            var moneytype = $("#Select1").val();

            

            var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); //创建XMLHTTP对象

            if(!xmlhttp){

                alert("创建xmlhttp对象异常！");

                return false;

            }

            xmlhttp.open("POST","HuiLv1.ashx?amount="+amount+"&moneytype="+moneytype+"&ts="+new Date(),false);

            xmlhttp.onreadystatechange = function(){

                if(xmlhttp.readyState == 4){

                    if(xmlhttp.status == 200){ //如果状态吗是200则代表成功。

                        $("#Text2").val(xmlhttp.responseText);

                    }

                    else

                    {

                        alert("ajax服务器返回错误");

                    }

                }

            }

            xmlhttp.send();

        }

    </script>

</head>

<body>

    <input id="Text1" type="text" />

    <select id="Select1" name="D1">

        <option value="1">美元</option>

        <option value="2">日元</option>

        <option value="3">港币</option>

    </select>

    <input id="Button1" type="button" value="button" /><input id="Text2" 

        type="text" />

</body>

</html>

这是前台HTML页。
下面是后台ashx.cs



using System;

using System.Collections;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Services;

using System.Web.Services.Protocols;

using System.Xml.Linq;



namespace AJAX测试1

{

    /// <summary>

    /// $codebehindclassname$ 的摘要说明

    /// </summary>

    [WebService(Namespace = "http://tempuri.org/")]

    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

    public class HuiLv1 : IHttpHandler

    {



        public void ProcessRequest(HttpContext context)

        {

            context.Response.ContentType = "text/plain";

            string amount = context.Request["amount"];

            int iAmount = Convert.ToInt32(amount);

            string moneytype = context.Request["moneytype"];

            if (moneytype == "1") //美元

            {

                context.Response.Write(iAmount / 7);

            }

            else if (moneytype == "2") //日元

            {

                context.Response.Write(iAmount * 10);

            }

            else if (moneytype == "3") //港币

            {

                context.Response.Write(iAmount * 10 / 9);

            }

            else

            { 

                

            }

        }



        public bool IsReusable

        {

            get

            {

                return false;

            }

        }

    }

}