Web Front-endJS TutorialJavaScript provincial and municipal three-level linkage drop-down menu example demonstration_javascript skills
This article describes the example of javascript implementing the three-level linkage drop-down box menu code of provinces and municipalities. Just like when selecting 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 it can be realized For the three-level linkage of provinces, cities and counties, native JavaScript is used below to implement this function and is shared with everyone for your reference. The details are as follows:
The screenshot of the running effect is as follows:
The specific 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>
This example is similar to filling in the delivery address when shopping on Taobao, achieving three-level linkage between provinces, cities and counties. I hope everyone can apply it to their own works and apply what they have learned.
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