【www.bbyears.com--jquery】
本文实例讲述了jQuery+Asp.Net实现省市二级联动功能的方法。分享给大家供大家参考，具体如下：
页面html:
代码如下
<%@ Page Language="C#"AutoEventWireup="true"CodeFile="ddlAjax.aspx.cs"Inherits="ThreeAjaxDrop_ddlAjax"%>
<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("");
});
});
//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("");
});
});
});
//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("");
});
});
});
});
</script>
word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 13.3333px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 20px; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px;">asp.net部分:
(1)Default.aspx.cs
代码如下
publicpartialclassThreeAjaxDrop_Default : System.Web.UI.Page
{
protectedvoidPage_Load(objectsender, EventArgs e)
{
stringsql ="select * from province";
stringstrTemp ="\"text\":\"{0}\",\"value\":\"{1}\"";//构造格式字符串 {"text":"北京","value":"00001"}
StringBuilder sb =newStringBuilder();
OleDbDataReader reader = OleDBHelper.ExecuteReader(sql);
while(reader.Read())
{
stringstr1 =string.Format(strTemp, reader["province"].ToString(), reader["provinceID"].ToString());
sb.Append("{"+str1+"},");
}
reader.Close();
stringjson = sb.ToString();
Response.Write("["+json.Substring(0,json.Length-1)+"]");
}
}
(2)HandlerDropDownAjax.ashx
代码如下
publicclassHandlerDropDownAjax : IHttpHandler {
publicvoidProcessRequest (HttpContext context) {
if(context.Request.QueryString["type"] !=null&& context.Request.QueryString["fid"] !=null)
{
stringtype = context.Request.QueryString["type"].ToString();//主要用于识别是查询city还是area表
stringfid = context.Request.QueryString["fid"].ToString(); //城市或区域的父ID
stringsql ="select * from "+ type +" where father='"+ fid +"'";
//构造数据的类型[{"text":"南昌","value":"0001"},{"text":"上饶","value":"0002"}]
//string strTemp = "{\"text\":\"{0}\",\"value\":\"{1}\"}";//这里犯了个错误：直接这样构造会出错，因为大括号里又有格式大括号，解析会出错
stringstrTemp ="\"text\":\"{0}\",\"value\":\"{1}\"";//构造格式字符串 {"text":"北京","value":"00001"}
StringBuilder sb =newStringBuilder();
OleDbDataReader reader = OleDBHelper.ExecuteReader(sql);
while(reader.Read())
{
stringstr1 =string.Format(strTemp, reader[2].ToString(), reader[1].ToString());
sb.Append("{"+ str1 +"},");//两边的大括号格式化后加上
}
reader.Close();
stringjson = sb.ToString();
context.Response.Write("["+ json.Substring(0, json.Length - 1) +"]");//Substring的作用是去掉最后一个'逗号'
}
}
publicboolIsReusable {
get{
returnfalse;
}
}
}
希望本文所述对大家asp.net程序设计有所帮助。