本文主要分享了js實作省市區三級連動選單效果的範例程式碼。具有很好的參考價值，以下跟著小編一起來看下吧
效果如下：
程式碼如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>省市区三级联动</title>
</head>
<body>
<form>
<select id="province">
<option>请选择省份</option>
</select>
<select id="city">
<option>请选择城市</option>
</select>
<select id="district">
<option>请选择区域</option>
</select>
</form>
<script src="json.js"></script>
<script type="text/javascript">
var proData = [],
cityData = [],
distData = [];
var proSelect = document.getElementById("province"),
citySelect = document.getElementById("city"),
districtSelect = document.getElementById("district");
var curPro = "",
curCity = "";
// 封装更新选择列表函数
function fillselect(select,list){
for (var i = select.length-1; i > 0 ; i--){
select.remove(i);
}
list.forEach(function(data){
var option = new Option(data.name, data.sheng);
option.dataset.di = data.di;
select.add(option);
})
}
// 将数据按省、市、地区分别存储
dataJson.forEach(function(data){
if (data.level === 1){
proData.push(data);
}
if (data.level === 2){
cityData.push(data);
}
if (data.level === 3){
distData.push(data);
}
})
fillselect(proSelect,proData);
// 监听一级省份选择列表change事件，更新二级城市列表
proSelect.addEventListener("change",function(event){
var val = event.target.value;
var list = [];
cityData.forEach(function(d){
if (d.sheng === val) {
list.push(d);
}
})
fillselect(citySelect,list);
})
// 监听二级城市选择列表change事件，更新三级区域列表
citySelect.addEventListener("change",function(event){
var val = event.target.value;
var curIndex = event.target.selectedIndex;
curCity = event.target[curIndex].dataset.di;
console.log(event.target,curCity);
var list = [];
distData.forEach(function(d){
if (d.di === curCity && d.sheng === val) {
list.push(d);
}
})
fillselect(districtSelect,list);
})
</script>
</body>
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