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JQUREY 调用 shax
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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm2.aspx.cs" Inherits="JqueryDemoTest.WebForm2" %>
 
<!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></title>
    <script src="js/jquery-1.4.1.min.js" type="text/javascript"></script>
    <script src="js/jquery-1.4.1-vsdoc.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            $('#btn').click(function () {
                $.post('Handler.ashx', { val: $("#<%=ddlMain.ClientID %>").val() }, function (data) {
                    var json = eval(data);
                    var html = '';
                    for (var i in json) {
                        html += '<option value="' + json[i].Value + '">' + json[i].Name + '</option>';
                    }
                    $("#<%=ddlSub.ClientID %>")[0].options.length = 0;
                    $(html).appendTo($("#<%=ddlSub.ClientID %>"));
 
                });
 
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
       <asp:DropDownList ID="ddlMain" runat="server">
        <asp:ListItem Text="一级城市" Value="1"></asp:ListItem>
        <asp:ListItem Text="旅游城市" Value="2"></asp:ListItem>
    </asp:DropDownList>
    <asp:DropDownList ID="ddlSub" runat="server">
    </asp:DropDownList>
    <input type="button" id='btn' value='click me' />
    </div>
    </form>
</body>
</html>

code ashx

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
 
namespace JqueryDemoTest
{
    /// <summary>
    /// Summary description for Handler
    /// </summary>
    public class Handler : IHttpHandler
    {
 
        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
 
            string json = string.Empty;
 
            if (context.Request.Form["val"] == "1")
            {
                json = "[{\"Name\":\"北京\",\"Value\":1},{\"Name\":\"深圳\",\"Value\":2},{\"Name\":\"上海\",\"Value\":3}]";
            }
            else if (context.Request.Form["val"] == "2")
            {
                json = "[{\"Name\":\"杭州\",\"Value\":4},{\"Name\":\"苏州\",\"Value\":5},{\"Name\":\"桂林\",\"Value\":6}]";
            }
 
            context.Response.Write(json);
            context.Response.End();
        }
 
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

 

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