用JavaScript实现动态省市县三级联动_JavaScript教程_开发教程

像平时购物选择地址时一样，通过选择的省动态加载城市列表，通过选择的城市动态加载县区列表，从而可以实现省市县的三级联动，下面使用原生的JavaScript来实现这个功能：

<!DOCTYPE html>

<html>

<title>三级联动测试</title>

//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>

<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>

<option id="Not_data3">Country</option>

</select>

<br/>

</body>

</html>

当然，省市县三者都是动态联动的，只要顶级的内容发生改变，所有子级的内容也会发生改变或被重置为City或Country.

(责任编辑：最模板)