这个是一个layui省市区三级联动插件，近来使用layui后台模板框架开发后台系统，要用到省市县/区三级联动，本想从网上找个现成的轮子，然没有自己想要的需求，就自己造了个。
本插件实现省市区相应数据通过ajax动态从服务端加载数据，省市区数据结构key-value形式。
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="renderer" content="webkit">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="format-detection" content="telephone=no">
<link rel="stylesheet" href="./layui/css/layui.css" />
</head>
<body>
<div class="layui-form">
<div class="layui-input-inline">
<select name="province" lay-filter="province" class="province" province_default="110000">
<option value="">请选择省</option>
</select>
</div>
<div class="layui-input-inline">
<select name="city" lay-filter="city" city_default="110000" disabled>
<option value="">请选择市</option>
</select>
</div>
<div class="layui-input-inline">
<select name="area" lay-filter="area" area_default="" disabled>
<option value="">请选择县/区</option>
</select>
</div>
</div>
</body>
<script type="text/javascript" src="./layui/layui.js"></script>
<script type="text/javascript">
layui.config({
base : "./layuiarea/" //layuiarea.js的路径
}).use([ 'layer', 'jquery', "layuiarea" ], function() {
var layer = layui.layer, $ = layui.jquery, layuiarea = layui.layuiarea();
});
</script>
<html>
这里我们可以通过给province_default、city_default、area_default设值，来实现省市区默认选中项。
如只想显示二级联动，可将以下代码注释.
<div class="layui-input-inline">
<select name="area" lay-filter="area" area_default="" disabled>
<option value="">请选择县/区</option>
</select>
</div>
layui.define(["form","jquery"],function(exports){
var form = layui.form,
$ = layui.jquery,
Layuiarea = function(){};
Layuiarea.prototype.provinces = function() {
//加载省数据
var proHtml = '',that = this,url="https://demo.duiniya.com/test2/area.php";
$.get(url+"?type=0&id=0", function (data) {
var dataObj = eval(data);
var province_default = $("select[name=province]").attr("province_default");
var city_default = $("select[name=city]").attr("city_default");
var area_default = $("select[name=area]").attr("area_default");
$.each(dataObj,function(idx,item){
if(province_default ==item.code){
proHtml += '<option value="' + item.code + '" selected="">' + item.name + '</option>';
}else{
proHtml += '<option value="' + item.code + '">' + item.name + '</option>';
}
});
//初始化省数据
$("select[name=province]").append(proHtml);
form.render();//更新 所在容器内的全部表单状态
//处理市默认值
if(province_default!="" && city_default!="" ){
$.get(url+"?type=1&id="+province_default, function (data) {
var ciHtml='';
var dataObj = eval(data);
$.each(dataObj,function(idx,item){
if(city_default ==item.code){
ciHtml += '<option value="' + item.code + '" selected="">' + item.name + '</option>';
}else{
ciHtml += '<option value="' + item.code + '">' + item.name + '</option>';
}
});
//加载市
$("select[name=city]").append(ciHtml).removeAttr("disabled");
form.render();
});
if(area_default!=""){
//默认县/区
$.get(url+"?type=2&id="+city_default, function (data) {
var areaHtml='';
var dataObj = eval(data);
$.each(dataObj,function(idx,item){
if(area_default ==item.code){
areaHtml += '<option value="' + item.code + '" selected="">' + item.name + '</option>';
}else{
areaHtml += '<option value="' + item.code + '">' + item.name + '</option>';
}
});
//加载县区
$("select[name=area]").append(areaHtml).removeAttr("disabled");
form.render();
});
}
}
form.on('select(province)', function (proData) {
$("select[name=city]").html('<option value="">请选择市</option>');
var value = proData.value;
if (value > 0) {
$.get(url+"?type=1&id="+value, function (data) {
var ciHtml='';
var dataObj = eval(data);
$.each(dataObj,function(idx,item){
ciHtml += '<option value="' + item.code + '">' + item.name + '</option>';
});
//加载市
$("select[name=city]").append(ciHtml).removeAttr("disabled");
form.render();
});
} else {
$("select[name=city]").attr("disabled", "disabled");
}
});
form.on('select(city)', function (cityData) {
$("select[name=area]").html('<option value="">请选择县/区</option>');
var value = cityData.value;
if (value > 0) {
$.get(url+"?type=2&id="+value, function (data) {
var areaHtml='';
var dataObj = eval(data);
$.each(dataObj,function(idx,item){
areaHtml += '<option value="' + item.code + '">' + item.name + '</option>';
});
//加载县区
$("select[name=area]").append(areaHtml).removeAttr("disabled");
form.render();
});
} else {
$("select[name=area]").attr("disabled", "disabled");
}
});
})
}
var layuiarea = new Layuiarea();
exports("layuiarea",function(){
layuiarea.provinces();
});
})
<?php
$id = $_GET['id'] ?? 0;
$type = $_GET['type'] ?? 0;//
if(!$type && !$id){
$data = [0 => [['code' => 110000, 'name' => '北京'],
//其他省...
['code' => 130000, 'name' => "河北"],],
];
}elseif($type==1){
//市
$data = [ 110000 => [['code' => 110000, 'name' => "北京"]],
130000 => [['code' => 130100, 'name' => '石家庄'], ['code' => 130400, 'name' => "邯郸"]],
];
}else{
//区
$data = [
130100=>[['code' => 130102, 'name' => '长安区'],],
110000=>[['code' => 110101, 'name' => '东城区'],],
130400=>[['code' => 130402, 'name' => '邯山区'],],
];
}
echo json_encode($data[$id], JSON_UNESCAPED_UNICODE);
预览地址：https://demo.duiniya.com/test2/demo.html
项目地址：https://github.com/guyan0319/layuiarea
如有任何问题或建议，欢迎批评指正！