本文摘自PHP中文网，作者藏色散人，侵删。

layui实现三级联动的方法：首先创建html的页面；然后创建【address.js】文件，内容为“Address.prototype.provinces = function(){...}”；最后通过layui模块实现三级联动即可。

本教程操作环境：windows10系统、layui2.5.6版，Dell G3电脑。

基于layui的三级联动模块

html的页面代码如下：

<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-v2.1.5/css/layui.css" />
    </head>
    <body>
        <p class="layui-form">
            <p class="layui-input-inline">
                <select name="province" lay-filter="province" class="province">
                    <option value="">请选择省</option>
                </select>
            </p>
            <p class="layui-input-inline">
                <select name="city" lay-filter="city" disabled>
                    <option value="">请选择市</option>
                </select>
            </p>
            <p class="layui-input-inline">
                <select name="area" lay-filter="area" disabled>
                    <option value="">请选择县/区</option>
                </select>
            </p>
        </p>
    </body>
    <script type="text/javascript" src="../../../layui-v2.1.5/layui.js"></script>
    <script type="text/javascript" src="address.js"></script>
    <script type="text/javascript">
        layui.config({
            base : "../../../js/" //address.js的路径
        }).use([ 'layer', 'jquery', "address" ], function() {
            var layer = layui.layer, $ = layui.jquery, address = layui.address();
 
        });
    </script>
<html>

address.js的代码入下：

ps:需要注意的有：  $.get("address.json", function (data) {} 的地址为json地址，地址不对会报异常。
layui.define(["form","jquery"],function(exports){
    var form = layui.form,
    $ = layui.jquery,
    Address = function(){};
 
    Address.prototype.provinces = function() {
        //加载省数据
        var proHtml = '',that = this;
        $.get("address.json", function (data) {
            for (var i = 0; i < data.length; i++) {
                proHtml += '<option value="' + data[i].code + '">' + data[i].name + '</option>';
            }
            //初始化省数据
            $("select[name=province]").append(proHtml);
            form.render();
            form.on('select(province)', function (proData) {
                $("select[name=area]").html('<option value="">请选择县/区</option>');
                var value = proData.value;
                if (value > 0) {
                    that.citys(data[$(this).index() - 1].childs);
                } else {
                    $("select[name=city]").attr("disabled", "disabled");
                }
            });
        })
    }
 
    //加载市数据
    Address.prototype.citys = function(citys) {
        var cityHtml = '<option value="">请选择市</option>',that = this;
        for (var i = 0; i < citys.length; i++) {
            cityHtml += '<option value="' + citys[i].code + '">' + citys[i].name + '</option>';
        }
        $("select[name=city]").html(cityHtml).removeAttr("disabled");
        form.render();
        form.on('select(city)', function (cityData) {
            var value = cityData.value;
            if (value > 0) {
                that.areas(citys[$(this).index() - 1].childs);
            } else {
                $("select[name=area]").attr("disabled", "disabled");
            }
        });
    }
 
    //加载县/区数据
    Address.prototype.areas = function(areas) {
        var areaHtml = '<option value="">请选择县/区</option>';
        for (var i = 0; i < areas.length; i++) {
            areaHtml += '<option value="' + areas[i].code + '">' + areas[i].name + '</option>';
        }
        $("select[name=area]").html(areaHtml).removeAttr("disabled");
        form.render();
    }
 
    var address = new Address();
    exports("address",function(){
        address.provinces();
    });
});