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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