AJAX和WebService实现省市县三级联动具体代码

【 tulaoshi.com - Web开发 】

-------------------------------------WebService1.asmx---------------------------------------
代码如下：

// 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
[System.Web.Script.Services.ScriptService]
public class WebService1 : System.Web.Services.WebService
{
[WebMethod]
public string HelloWorld()
{
return "Hello World";
}
[WebMethod]
public ListModel.province GetProvince()
{
BLL.province bpro = new BLL.province();
ListModel.province list = bpro.GetListModel();
return list;
}
[WebMethod]
public ListModel.city GetCityByPro(string proid)
{
BLL.city bcity = new BLL.city();
ListModel.city list = bcity.GetListModel("father='" + proid + "'");
return list;
}
[WebMethod]
public ListModel.area GetAreaByCity(string cityid)
{
BLL.area barea = new BLL.area();
ListModel.area list = barea.GetListModel("father='" + cityid + "'");
return list;
}

----------------------------------HTMLPage1.htm----------------------------
代码如下：

html xmlns="http://www.w3.org/1999/xhtml"
head
title/title
style type="text/css"
select
{
width: 150px;
}
/style
script src="js/Jquery1.7.js" type="text/javascript"/script
script type="text/javascript"
$(function () {
$.ajax({
type: "post",
contentType: "application/json",
url: "WebService1.asmx/GetProvince",
data: "{}",
success: function (result) {
var stroption = '';
for (var i = 0; i result.d.length; i++) {
stroption += 'option value=' + result.d[i].provinceID + '';
stroption += result.d[i].provincename;
stroption += '/option';
}
$('#seprovince').append(stroption);
}
})
$('#seprovince').change(function () {
$('#secity option:gt(0)').remove();
$('#searea option:gt(0)').remove();
$.ajax({
type: "post",
contentType: "application/json",
url: "WebService1.asmx/GetCityByPro",
data: "{proid:'" + $(this).val() + "'}",
success: function (result) {
var strocity = '';
for (var i = 0; i result.d.length; i++) {
strocity += 'option value=' + result.d[i].cityID + '';
strocity += result.d[i].cityname;
strocity += '/option';
}
$('#secity').append(strocity);
}
})
})
$('#secity').change(function () {
$('#searea option:gt(0)').remove();
$.ajax({
type: "post",
contentType: "application/json",
url: "WebService1.asmx/GetAreaByCity",
data: "{cityid:'" + $(this).val() + "'}",
success: function (result) {
var stroarea = '';
for (var i = 0; i result.d.length; i++) {
stroarea += 'option value=' + result.d[i].areaID + '';
stroarea += result.d[i].areaname;
stroarea += '/option';
}
$('#searea').append(stroarea);
}
})
})
})
/script
/head
body
table
tr
td
地址
/td
td
select id="seprovince"
option--请选择--/option
/select
省
select id="secity"
option--请选择--/option
/select市
select id="searea"
option--请选择--/option
/select县
/td
/tr
/table
/body
/html


注：用到了三层架构，dal层写了一些方法