标签:city name address length 联动 child var 三级
代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>三级联动</title>
</head>
<body>
<!-- 省市区 -->
省<select name="" id="province">
<option value="">---请选择---</option>
</select>
市<select name="" id="city">
<option value="">---请选择---</option>
</select>
区/县<select name="" id="distinct">
<option value="">---请选择---</option>
</select>
<script>
// 模拟json数据
var address = [{
"name": "陕西省",
"child": [{
"name": "西安市",
"child": [{
"name": "阎良区"
}, {
"name": "长安区"
}, {
"name": "雁塔区"
}]
},
{
"name": "榆林市",
"child": [{
"name": "榆阳区"
}, {
"name": "绥德县"
}, {
"name": "米脂县"
}, {
"name": "横山区"
}]
}
]
}, {
"name": "江苏省",
"child": [{
"name": "南京市",
"child": [{
"name": "南京区1"
}, {
"name": "南京区2"
}, {
"name": "南京区3"
}]
},
{
"name": "连云港市",
"child": [{
"name": "连云港市1区"
}, {
"name": "连云港市2区",
}, {
"name": "连云港市3区"
}]
}
]
}, {
"name": "广东省",
"child": [{
"name": "佛山市",
"child": [{
"name": "佛山1区"
}, {
"name": "佛山2区"
}, {
"name": "佛山3区"
}]
},
{
"name": "深圳市",
"child": [{
"name": "深圳1区"
}, {
"name": "深圳2区"
}]
}
]
}]
var province = document.getElementById("province");
var city = document.getElementById("city");
var distinct = document.getElementById("distinct");
var cityname = null;
var quname=null;
// console.log(address.length);//3
for (var i = 0; i < address.length; i++) {
var opt = new Option(address[i].name, i);
province.appendChild(opt);
}
province.onchange = function () {
city.options.length=1;
distinct.options.length=1;
var index = this.value;
cityname = address[index].child;
for (var i = 0; i < cityname.length; i++) {
var opt = new Option(cityname[i].name, i);
city.appendChild(opt);
}
}
city.onchange=function (){
distinct.options.length=1;
var index=this.value;
quname=cityname[index].child;
for(var i=0;i<quname.length;i++){
var opt=new Option(quname[i].name,i);
distinct.appendChild(opt);
}
}
//option(text,value);
//option(下一级内容,索引)
</script>
</body>
</html>
标签:city,name,address,length,联动,child,var,三级 来源: https://blog.csdn.net/Wang_jiao_yaa/article/details/100109358
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