layui实现下拉框三级联动

CREATE TABLE `dt_area` (
 `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '区域主键',
 `area_name` varchar(16) DEFAULT NULL COMMENT '区域名称',
 `area_code` varchar(128) DEFAULT NULL COMMENT '区域代码',
 `area_short` varchar(32) DEFAULT NULL COMMENT '区域简称',
 `area_is_hot` varchar(1) DEFAULT NULL COMMENT '是否热门(0:否、1:是)',
 `area_sequence` int(11) DEFAULT NULL COMMENT '区域序列',
 `area_parent_id` int(11) DEFAULT NULL COMMENT '上级主键',
 `init_date` timestamp NULL DEFAULT CURRENT_TIMESTAMP COMMENT '初始时间',
 PRIMARY KEY (`id`),
 KEY `parent_id` (`area_parent_id`) USING HASH
) ENGINE=InnoDB AUTO_INCREMENT=900001 DEFAULT CHARSET=utf8 COMMENT='区域字典';

<select id="queryByParentId" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
 select
 <include refid="Base_Column_List" />
 from dt_area
 where area_parent_id = #{id,jdbcType=INTEGER}
</select>

<div class="layui-form-item">
 <label class="layui-form-label">地址</label>
 <div class="layui-input-inline">
 <select id="province" lay-filter="province" lay-verify="required" lay-search="">
 <option value="">请选择或搜索省</option>
 </select>
 </div>
 <div class="layui-input-inline">
 <select id="city" lay-filter="city" lay-verify="required" lay-search="">
 <option value="">请选择或搜索市</option>
 </select>
 </div>
 <div class="layui-input-inline">
 <select id="area" lay-filter="area" lay-verify="required" lay-search="">
 <option value="">请选择或搜索县/区</option>
 </select>
 </div>
 
 <div class="layui-input-inline" style="width: 45%;">
 <input class="layui-input" id="" lay-verify="required" placeholder="请输入详细地址：城镇＋乡村＋街道＋门牌号码"></input>
 </div>
</div>

layui.use(['form','layer','jquery'],function(){
 var form = layui.form,
 layer = parent.layer === undefined ? layui.layer : parent.layer,
 $ = layui.jquery;
 
 var provinceText = "";
 var cityText = "";
 var areaText = "";
 //异步加载下拉框数据
 $.post(WEB_ROOT+"dtArea/queryByParentId",{"id":0},function (data) {
 if(!data.success){
 layer.msg(data.msg)
 }else{
 var $html = "";
 if(data.data != null) {
 $.each(data.data, function (index, item) {
 $html += "<option value='" + item.id + "'>" + item.areaName + "</option>";
 });
 $("#province").append($html);
 //append后必须从新渲染
 form.render('select');
 }
 }
 
 });
 
 //监听省下拉框
 form.on('select(province)', function(dataObj){
 //移除城市下拉框所有选项
 $("#city").empty();
 var cityHtml = '<option value="">请选择或搜索市</option>';
 $("#city").html(cityHtml);
 var areaHtml = '<option value="">请选择或搜索县/区</option>';
 $("#area").html(areaHtml);
 provinceText = $("#province").find("option:selected").text();
 var value = $("#province").val();
 //异步加载下拉框数据
 $.post(WEB_ROOT+"dtArea/queryByParentId",{"id":value},function (data) {
 if(!data.success){
 layer.msg(data.msg)
 }else{
 var $html = "";
 if(data.data != null) {
 $.each(data.data, function (index, item) {
 $html += "<option value='" + item.id + "'>" + item.areaName + "</option>";
 });
 $("#city").append($html);
 //append后必须从新渲染
 form.render('select');
 }
 }
 
 });
 
 });
 
 //监听市下拉框
 form.on('select(city)', function(dataObj){
 //移除县区下拉框所有选项
 $("#area").empty();
 var html = '<option value="">请选择或搜索县/区</option>';
 $("#area").html(html);
 
 cityText = $("#city").find("option:selected").text();
 var value = $("#city").val();
 //异步加载下拉框数据
 $.post(WEB_ROOT+"dtArea/queryByParentId",{"id":value},function (data) {
 if(!data.success){
 layer.msg(data.msg)
 }else{
 var $html = "";
 if(data.data != null) {
 $.each(data.data, function (index, item) {
 $html += "<option value='" + item.id + "'>" + item.areaName + "</option>";
 });
 $("#area").append($html);
 //append后必须从新渲染
 form.render('select');
 }
 }
 
 });
 
 });
 
 //监听县区下拉框
 form.on('select(area)', function(dataObj){
 areaText = $("#area").find("option:selected").text();
 });
});