首先是生成xml文件，生成xml文件前去网上DOWNload一个最新中国省市行政数据库
public void createxml(string filename)
{
XmlTextWriter mywrite = new XmlTextWriter(filename, Encoding.UTF8);
try
{
mywrite.Formatting = Formatting.Indented;
mywrite.WriteStartDocument();
//mywrite.WriteProcessingInstruction("xml"
mywrite.WriteStartElement("local");
mywrite.WriteAttributeString("country", "中国");
pdt = getprovincelist();
if (pdt.Rows.Count > 0)
{
for (int i = 0; i < pdt.Rows.Count; i++)
{
mywrite.WriteStartElement("province");
mywrite.WriteAttributeString("province", pdt.Rows[i]["province"].ToString());
mywrite.WriteAttributeString("provinceID", pdt.Rows[i]["provinceID"].ToString());
cdt = getcitylist(pdt.Rows[i]["provinceID"].ToString());
if (cdt.Rows.Count > 0)
{
for (int j = 0; j < cdt.Rows.Count; j++)
{
mywrite.WriteStartElement("city");
mywrite.WriteAttributeString("city", cdt.Rows[j]["city"].ToString());
mywrite.WriteAttributeString("cityID", cdt.Rows[j]["cityID"].ToString());
adt = getarealist(cdt.Rows[j]["cityID"].ToString());
if (adt.Rows.Count > 0)
{
for (int k = 0; k < adt.Rows.Count; k++)
{
mywrite.WriteStartElement("area");
mywrite.WriteAttributeString("area", adt.Rows[k]["area"].ToString());
mywrite.WriteAttributeString("areaID", adt.Rows[k]["areaID"].ToString());
mywrite.WriteEndElement();
}
}
mywrite.WriteEndElement();
}
}
mywrite.WriteEndElement();
}
}
mywrite.WriteEndElement();
mywrite.WriteEndDocument();
}
catch (Exception ex)
{
throw ex;
}
finally
{
mywrite.Close();
}
}
/*****/
接下来是aspx页面，需要引用jquery.js和jquery.xml2json.js（这是一个把xml转换成json的插件）
以下是代码
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="test_Default" %>
<!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 language="javascript" type="text/javascript" src="../jquery.js"></script>
<script language="javascript" type="text/javascript" src="../opselect.js"></script>
<script language="javascript" type="text/javascript" src="../jquery.xml2json.js"></script>
<script language="javascript" type="text/javascript">
$(function()
{
var local
$.get("20090107.xml",function(xml){
local = $.xml2json(xml, true);
for(index in local.province)
{
$("#Select1").addOption(local.province[index].province,local.province[index].provinceID);
}
}
);
$("#Select1").bind("change",function()
{//选清空城市，县城的值;
$("#Select2").clearAll();
$("#Select2").addOption("--请选择--",0);
$("#Select3").clearAll();
$("#Select3").addOption("--请选择--",0);
var provinceID=$("#Select1").getSelectedValue();
for(provinceindex in local.province)
{
if(local.province[provinceindex].provinceID==provinceID)
{
for(cityindex in local.province[provinceindex].city)
{
$("#Select2").addOption(local.province[provinceindex].city[cityindex].city,local.province[provinceindex].city[cityindex].cityID);
}
break;
}
}
}
);
$("#Select2").bind("change",function()
{//选清空城市，县城的值;
$("#Select3").clearAll();
$("#Select3").addOption("--请选择--",0);
var provinceID=$("#Select1").getSelectedValue();
var cityid=$("#Select2").getSelectedValue();
for(provinceindex in local.province)
{
if(local.province[provinceindex].provinceID==provinceID)
{
for(cityindex in local.province[provinceindex].city)
{
if(local.province[provinceindex].city[cityindex].cityID==cityid)
{
for(townindex in local.province[provinceindex].city[cityindex].area)
{
$("#Select3").addOption(local.province[provinceindex].city[cityindex].area[townindex].area,local.province[provinceindex].city[cityindex].area[townindex].areaID);
}
}
}
}
}
}
);
//$("#Select2").clearother();
}
);
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<select id="Select1">
<option value="0">--请选择--</option>
</select>
<select id="Select2">
<option value="0">--请选择--</option>
</select>
<select id="Select3">
<option value="0">--请选择--</option>
</select>
</div>
</form>
</body>
</html>