Native JavaScript implements dynamic province, city and county three-level linkage drop-down menu example code

Native JavaScript implements dynamic province, city and county three-level linkage drop-down menu example code_javascript skills

WBOY

Release： 2016-05-16 15:16:22

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Just like when choosing an address for shopping, the city list is dynamically loaded through the selected province, and the county list is dynamically loaded through the selected city, so that the three-level linkage of provinces, cities and counties can be achieved. The following uses native JavaScript to implement this function :

Let me show you the test results first:

When no selection is made:

When selecting:

The code is as follows:

<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>三级联动测试</title>
<script src="jquery-2.1.4.min.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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Of course, provinces, cities and counties are all dynamically linked. As long as the top-level content changes, all sub-level content will also change or be reset to City or Country.

The above is the native JavaScript code that the editor shared with you to realize the dynamic province, city and county three-level linkage drop-down box menu example code. I hope it will be helpful to everyone.