我要评论<!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;
}
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