ajax.net +jquery 无刷新三级联动的实例代码
作者：
<!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>
<title></title>
<script src="Jquery1.7.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$.ajax({
type: "post",
contentType: "application/json",
url: "WebService1.asmx/loadprovince",
data: "{}",
success: function (result) {
var ping;
for (var i = 0; i < result.d.length; i++) {
ping += "<option value=" + result.d[i].provinceID + ">";
ping += result.d[i].provincename;
ping += "</option>";
}
$('#Select1').append(ping);
}
})
$('#Select1').change(function () {
//第二次选时要记得清空市和县中的内容
$('#Select2 option:gt(0)').remove();
$('#Select3 option:gt(0)').remove();
//在省的改变事件里绑定下一个下来列表（要失掉省的id）
$.ajax({
type: "post",
contentType: "application/json",
url: "WebService1.asmx/loadcity",
data: "{fatherid:'" + $('#Select1 option:selected').val() + "'}",
success: function (result) {
var str2;
for (var i = 0; i < result.d.length; i++) {
str2 += "<option value=" + result.d[i].cityID + ">";
str2 += result.d[i].cityname;
str2 += "</option>";
}
$('#Select2').append(str2);
}
})
})
$('#Select2').change(function () {
$('#Select3 option:gt(0)').remove();
$.ajax({
type: "post",
contentType: "application/json",
url: "WebService1.asmx/loadarea",
data: "{fatherid:'" + $('#Select2 option:selected').val() + "'}",
success: function (result) {
var str3;
for (var i = 0; i < result.d.length; i++) {
str3 += "<option value=" + result.d.areaID + ">";
str3 += result.d[i].areaname;
str3 += result.d[i].father;
}
$('#Select3').append(str3);
}
})
})
})
</script>
</head>
<body>
省：
<select id="Select1">
<option>--请选择--</option>
</select>
市：
<select id="Select2">
<option>--请选择--</option>
</select>
县：
<select id="Select3">
<option>--请选择--</option>
</select>
</body>
</html>
webservice:
[WebMethod]//加载省
public List<Model.province> loadprovince()//为什么要用list因为这里出从前的值不可能一个实例是多个model实例，一个实例就是一条记载这样做防止字段错误
{
BLL.province bp = new BLL.province();
List<Model.province> list=bp.getlistModel();
return list;
}
[WebMethod]//加载市
public List<Model.city> loadcity(string fatherid)
{
BLL.city bc = new BLL.city();
List<Model.city> list = bc.getlistmodel(fatherid);
return list;
}
[WebMethod]//加载县
public List<Model.area> loadarea(string fatherid)
{
BLL.area ba = new BLL.area();
List<Model.area> list = ba.getlistmodel(fatherid);
return list;
}
}
}
DAL--area
public System.Collections.Generic.List<Model.area> getlistmodel(string fatherid)
{
System.Collections.Generic.List<Model.area> list = new System.Collections.Generic.List<Model.area>();
DataTable dt = GetList("father=" + fatherid + "").Tables[0];
foreach (DataRow row in dt.Rows)
{
Model.area ma = new Model.area();
ma.areaID = row["areaID"].ToString();
ma.areaname = row["areaname"].ToString();
ma.father = row["father"].ToString();
list.Add(ma);
}
return list;
}
Dal--city
public System.Collections.Generic.List<Model.area> getlistmodel(string fatherid)
{
System.Collections.Generic.List<Model.area> list = new System.Collections.Generic.List<Model.area>();
DataTable dt = GetList("father=" + fatherid + "").Tables[0];
foreach (DataRow row in dt.Rows)
{
Model.area ma = new Model.area();
ma.areaID = row["areaID"].ToString();
ma.areaname = row["areaname"].ToString();
ma.father = row["father"].ToString();
list.Add(ma);
}
return list;
}
}
DAL-provience
public System.Collections.Generic.List<Model.province> getlistModel()
{
//将要查的内容以实例的方式返回
//这里要做的就是要建立list并将list用model实例填满，而model要用一个方法失掉数据并添加到model中
//建list实例
System.Collections.Generic.List<Model.province> list = new System.Collections.Generic.List<Model.province>();
//已经有了的失掉数据的方法就不用自己写了通过调用Getlist的方法操纵数据库拿到数据
DataTable dt = GetList("").Tables[0];
//拿到数据后就需要将数据添加到model实例中了
foreach (DataRow row in dt.Rows)
{
//每一行都是个实例所以要将model的放在循环里面
Model.province mp = new Model.province();
mp.provinceID = row["provinceID"].ToString();
mp.provincename = row["provincename"].ToString();
list.Add(mp);//没添加完一个实例都要放到list中
}
return list;
}