<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <script src="js/jquery-1.7.1.min.js"></script> <title></title> <style type="text/css"> .st { 150px; } </style> </head> <body> <form id="form1" runat="server"> <div> <select class="st" id="st1"> <option>加载中....</option> </select> <select class="st" id="st2"><option>加载中....</option></select> <select class="st" id="st3"><option>加载中....</option></select> </div> </form> </body> </html> <script type="text/javascript"> statesload('1'); function statesload(a) { if (a == "1") { $.ajax({ url: "ccc.ashx", data: { "pcode": "0001" }, type: "post", dataType: "json", success: function (msg) { $("#st1").html(''); for (i in msg) { var str = "<option value='" + msg[i].code + "'>" + msg[i].name + "</option>"; $("#st1").append(str); } statesload('2'); }, beforeSend: function () { $("#st1").html(''); $("#st1").append("<option value='null'>加载中...</option>"); } }); } if (a == "2") { $.ajax({ url: "ccc.ashx", data: { "pcode":$("#st1").val()}, type: "post", dataType: "json", success: function (msg) { $("#st2").html(''); for (i in msg) { var str = "<option value='" + msg[i].code + "'>" + msg[i].name + "</option>"; $("#st2").append(str); } statesload('3'); }, beforeSend: function () { $("#st2").html(''); $("#st2").append("<option value='null'>加载中...</option>"); } }); } if (a == "3") { $.ajax({ url: "ccc.ashx", data: { "pcode": $("#st2").val() }, type: "post", dataType: "json", success: function (msg) { $("#st3").html(''); for (i in msg) { var str = "<option value='" + msg[i].code + "'>" + msg[i].name + "</option>"; $("#st3").append(str); } }, beforeSend: function () { $("#st3").html(''); $("#st3").append("<option value='null'>加载中...</option>"); } }); } } $("#st1").change(function () { statesload('2'); }); $("#st2").change(function () { statesload('3'); }); </script>
<%@ WebHandler Language="C#" Class="ccc" %> using System; using System.Web; using System.Linq; using System.Collections.Generic; using System.Text; public class ccc : IHttpHandler { public void ProcessRequest (HttpContext context) { System.Threading.Thread.Sleep(2000); StringBuilder str = new StringBuilder(); str.Append("["); string s=context.Request["pcode"]; using (DataClasses2DataContext con = new DataClasses2DataContext()) { int count = 0; List<ChinaStates> clist = con.ChinaStates.Where(r => r.ParentAreaCode == s).ToList(); foreach(ChinaStates c in clist) { if (count > 0) str.Append(","); str.Append("{"code":""+c.AreaCode+"","name":""+c.AreaName+""}"); count++; } } str.Append("]"); context.Response.Write(str); context.Response.End(); } public bool IsReusable { get { return false; } } }