liandong.aspx:
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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="liandong.aspx.cs" Inherits="WebApplication1.liandong" %> <!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 src="script/jquery-1.6.2.js" type="text/javascript"></script> <script language="javascript" type="text/javascript"> $(function() { $("#DropDownList1").change(function() { var defaultValue = "<option value='-1'>--请选择--</option>"; $("#DropDownList2").html(defaultValue); $("#DropDownList3").html(defaultValue); showMsg("#DropDownList1", "#DropDownList2"); }) $("#DropDownList2").change(function() { var defaultValue = "<option value='-1'>--请选择--</option>"; $("#DropDownList3").html(defaultValue); showMsg("#DropDownList2", "#DropDownList3"); }) }) function showMsg(sender, receiver) { var d1 = $(sender).val(); $.ajax({ type: 'get', dataType: "json", url: 'liandong.ashx', data: 'pid=' + d1, success: function(data) { $.each(data, function(i, o) { var opts = "<option value='" + o.id + "'>" + o.name + "</option>"; $(receiver).append(opts); }) } }) } </script> </head> <body> <form id="form1" runat="server"> <div> <asp:DropDownList ID="DropDownList1" runat="server"> <asp:ListItem Value="-1">--请选择--</asp:ListItem> </asp:DropDownList> <asp:DropDownList ID="DropDownList2" runat="server"> <asp:ListItem Value="-1">--请选择--</asp:ListItem> </asp:DropDownList> <asp:DropDownList ID="DropDownList3" runat="server"> <asp:ListItem Value="-1">--请选择--</asp:ListItem> </asp:DropDownList> </div> </form> </body> </html>
liandong.aspx.cs
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using System; using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; namespace WebApplication1 { public partial class liandong : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if(!IsPostBack) { string sql = "select * from t_ld where pid=0"; DataTable dt = DBhelper.query(sql); foreach (DataRow dr in dt.Rows) { ListItem li = new ListItem(dr["name"].ToString(), dr["id"].ToString()); this.DropDownList1.Items.Add(li); } } } } }
liandong.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 WebApplication1 { /// <summary> /// $codebehindclassname$ 的摘要说明 /// </summary> [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] public class liandong1 : IHttpHandler { public void Proce***equest(HttpContext context) { context.Response.ContentType = "text/html"; if(!string.IsNullOrEmpty(context.Request.QueryString["pid"])) { int pid = Convert.ToInt32(context.Request.QueryString["pid"]); string sql = "select * from t_ld where pid=" + pid; DataTable dt = DBhelper.query(sql); string json_str = ""; json_str += "["; foreach (DataRow dr in dt.Rows) { json_str += "{\"id\""; json_str += ":"; json_str += "\"" + dr["id"].ToString() + "\""; json_str += ","; json_str += "\"name\""; json_str += ":"; json_str += "\"" + dr["name"].ToString() + "\""; json_str += "}"; json_str += ","; } json_str = json_str.Substring(0, json_str.Length - 1); json_str += "]"; context.Response.Write(json_str); } } public bool IsReusable { get { return false; } } } }
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