本文将阐述如何解析复杂json数据（把数据中属于直辖市或特别行政区进行处理，格式化数据），并渲染到页面
案例效果图如下：
所有地址信息文件：http://59.110.140.61/file/city.json请自行下载。
格式化前的数据为(需要将直辖市和特别行政区分离出来)：
格式化后的数据为：
具体实现代码如下所示：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<select name="" id="province">
</select>
<select name="" id="city">
<option value="">请选择</option>
</select>
<select name="" id="town">
<option value="">请选择</option>
</select>
</body>
<script src="../ajax.js"></script>
<script>
class city{
constructor(){
this.province = document.querySelector(‘#province‘);
this.city = document.querySelector(‘#city‘);
this.town = document.querySelector(‘#town‘);
this.init();
}
init(){
this.getData();
}
getData(){
var that = this;
ajax({
url:‘city.json‘,
success:res=>{
this.res = JSON.parse(res).list;
this.res = formatData(this.res);
console.log(this.res);
var str = ‘<option value="">请选择</option>‘;
this.res.forEach(({city_id,name}) => {
str += `<option value="${city_id}">${name}</option>`;
});
this.province.innerHTML = str;
this.province.onchange = function(){
if(!this.value){
return;
}
that.getCity(this.value);
that.town.innerHTML = ‘<option value="">请选择</option>‘;
}
}
})
}
getCity(provinceValue){
var that = this;
var cityValue = this.res.filter(({name,city_id})=>{
return city_id === provinceValue;
})[0].list;
var str = ‘<option value="">请选择</option>‘;
cityValue.forEach(({name,city_id})=>{
str += `<option value="${city_id}">${name}</option>`;
})
this.city.innerHTML = str;
this.city.onchange = function(){
if(!this.value){
return;
}
that.getTown(this.value,cityValue);
}
}
getTown(value,city){
var town = city.filter(({name,city_id})=>{
return city_id === value;
})[0].list;
console.log(value);
var str = ‘<option value="">请选择</option>‘;
console.log(town);
town.forEach(({name,city_id})=>{
str += `<option value="${city_id}">${name}</option>`;
})
this.town.innerHTML = str;
}
}
function formatData(res){
var a = [];
for(var i = 0;i<4;i++){
a.push(res.shift());
}
var b =[];
var arr = res.filter(item=>{
if(item.name == ‘香港‘ || item.name == ‘澳门‘){
b.push(item);
}else{
return item;
}
})
arr.unshift({
name:‘直辖市‘,
city_id : ‘CH99‘,
list :a
},{
name:‘特别行政区‘,
city_id : ‘CH98‘,
list :b
});
return arr;
}
new city();
</script>
</html>