jquery无刷新三级联动_www.


$(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 += "";
ping += result.d[i].provincename;
ping += "";

}
$('#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 += "";
str2 += result.d[i].cityname;
str2 += "";
}

$('#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 += "";
str3 += result.d[i].areaname;
str3 += result.d[i].father;

}
$('#Select3').append(str3);
}
})
})
})



省：

--请选择--

市：

--请选择--

县：

--请选择--

[WebMethod]//加载省
public List 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 list=bp.getlistModel();
return list;
}
[WebMethod]//加载市
public List loadcity(string fatherid)
{
BLL.city bc = new BLL.city();
List list = bc.getlistmodel(fatherid);
return list;
}
[WebMethod]//加载县
public List loadarea(string fatherid)
{
BLL.area ba = new BLL.area();
List list = ba.getlistmodel(fatherid);
return list;

}
}
}

public System.Collections.Generic.List getlistmodel(string fatherid)
{
System.Collections.Generic.List list = new System.Collections.Generic.List();
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;
}

public System.Collections.Generic.List getlistmodel(string fatherid)
{
System.Collections.Generic.List list = new System.Collections.Generic.List();
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;
}
}

public System.Collections.Generic.List 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 list = new System.Collections.Generic.List();
//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;
}