原文地址：http://www.jb51.net/article/79125.htm
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>三级联动测试</title>
<script src="jquery.js"></script>
<script type="text/javascript">
//用来获得option元素中selected属性为true的元素的id
function Get_Selected_Id(place) {
var pro = document.getElementById(place);
var Selected_Id = pro.options[pro.selectedIndex].id;
return Selected_Id; //返回selected属性为true的元素的id
}
//改变下一个级联的option元素的内容，即加载市或县
function Get_Next_Place(This_Place_ID, Action) {
var Selected_Id = Get_Selected_Id(This_Place_ID); //Selected_Id用来记录当前被选中的省或市的ID
if (Action == 'Get_city') //从而可以在下一个级联中加载相应的市或县
Add_city(Selected_Id);
else if (Action == 'Get_country')
Add_country(Selected_Id);
}
//用来存储省市区的数据结构
var Place_dict = {
"GuangDong" : {
"GuangZhou" : [ "PanYu", "HuangPu", "TianHe" ],
"QingYuan" : [ "QingCheng", "YingDe", "LianShan" ],
"FoShan" : [ "NanHai", "ShunDe", "SanShui" ]
},
"ShanDong" : {
"JiNan" : [ "LiXia", "ShiZhong", "TianQiao" ],
"QingDao" : [ "ShiNan", "HuangDao", "JiaoZhou" ]
},
"HuNan" : {
"ChangSha" : [ "KaiFu", "YuHua", "WangCheng" ],
"ChenZhou" : [ "BeiHu", "SuXian", "YongXian" ]
}
};
//加载城市选项
function Add_city(Province_Selected_Id) {
$("#city").empty();
$("#city").append("<option>City</option>");
$("#country").empty();
$("#country").append("<option>Country</option>");
//上面的两次清空与两次添加是为了保持级联的一致性
var province_dict = Place_dict[Province_Selected_Id]; //获得一个省的字典
for (city in province_dict) { //取得省的字典中的城市
//添加内容的同时在option标签中添加对应的城市ID
var text = "<option"+" id='"+city+"'>" + city + "</option>";
$("#city").append(text);
console.log(text); //用来观察生成的text数据
}
}
//加载县区选项
function Add_country(City_Selected_Id) {
$("#country").empty();
$("#country").append("<option>Country</option>");
//上面的清空与添加是为了保持级联的一致性
var Province_Selected_ID = Get_Selected_Id("province"); //获得被选中省的ID，从而方便在字典中加载数据
var country_list = Place_dict[Province_Selected_ID][City_Selected_Id]; //获得城市列表
for (index in country_list) {
////添加内容的同时在option标签中添加对应的县区ID
var text = "<option"+" id=\'"+country_list[index]+"\'>"
+ country_list[index] + "</option>";
$("#country").append(text);
console.log(text); //用来观察生成的text数据
}
}
</script>
</head>
<body>
<p>您的收货地址：</p>
<select id="province" onchange="Get_Next_Place('province','Get_city')">
<option id="Not_data1">Province</option>
<option id="GuangDong" value="GuangDong">GuangDong</option>
<option id="ShanDong" value="ShanDong">ShanDong</option>
<option id="HuNan" value="HuNan">HuNan</option>
</select>
<select id="city" onchange="Get_Next_Place('city','Get_country')">
<option id="Not_data2">City</option>
</select>
<select id="country">
<option id="Not_data3">Country</option>
</select>
<br />
</body>
</html>
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