本文实例讲述了jQuery+Asp.Net实现省市二级联动功能的方法。，具体如下：
页面html:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ddlAjax.aspx.cs" Inherits="ThreeAjaxDrop_ddlAjax" %><!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>DropDownList三级联动</title><style type="text/css">*{margin:0; padding:0;}body{font-size:12px; font-family:Arial @宋体;}</style><script type="text/javascript" src="../js/jquery-1.4.min.js"></script><script type="text/javascript">$(document).ready(function() {//加载完成后绑定省份数据$.getJSON("Default.aspx", function(data) { //data的数据格式[{"text":"北京","value":"0001"},{"text":"江西","value":"0031"}]//alert(data[0].text+"|"+data[0].value);$.each(data, function(index, value) {//alert(value.text + "|" + value.value);$("#selProvince").append("<option value='" + value.value + "'>" + value.text + "</option>");});});//省份的值改变，则要绑定出城市下拉框$("#selProvince").change(function(){document.getElementById("selArea").options.length=1; //先清掉县下拉框的的数据document.getElementById("selCity").options.length=1; //先清掉城市下拉框的的数据$.getJSON("HandlerDropDownAjax.ashx",{"type":"city","fid":$(this).val()},function(data){$.each(data, function(index, value) {$("#selCity").append("<option value='" + value.value + "'>" + value.text + "</option>");});});});//城市下拉框的值改变$("#selCity").change(function(){document.getElementById("selArea").options.length=1; //先清掉县下拉框的的数据$.getJSON("HandlerDropDownAjax.ashx",{"type":"area","fid":$(this).val()},function(data){$.each(data, function(index, value) {$("#selArea").append("<option value='" + value.value + "'>" + value.text + "</option>");});});});});</script></head><body><form id="form1" runat="server"><div>三级联动：<select id="selProvince"><option value="选择省份">==选择省份==</option></select> <select id="selCity"><option>==选择城市==</option></select>& amp;nbsp; <select id="selArea"><option>==选择县==</option></select></div></form></body></html>asp.net部分:
(1)Default.aspx.cs
public partial class ThreeAjaxDrop_Default : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { string sql = "select * from province"; string strTemp = "/"text/":/"{0}/",/"value/":/"{1}/""; //构造格式字符串 {"text":"北京","value":"00001"} StringBuilder sb = new StringBuilder(); OleDbDataReader reader = OleDBHelper.ExecuteReader(sql); while (reader.Read()) { string str1 = string.Format(strTemp, reader["province"].ToString(), reader["provinceID"].ToString()); sb.Append("{"+str1+"},"); } reader.Close(); string json = sb.ToString(); Response.Write("["+json.Substring(0,json.Length-1)+"]"); }}
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