項目需要用layui的三級聯動，自己整理了一下，做個記錄

1.表結構設計

CREATE TABLE `dt_area` ( `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '區域主鍵', `area_name` varchar(16) DEFAULT NULL COMMENT '區域名稱', `area_code` varchar(128) DEFAULT NULL COMMENT '區域代碼', `area_short` varchar(32) DEFAULT NULL COMMENT '區域簡稱', `area_is_hot` varchar(1) DEFAULT NULL COMMENT '是否熱門(0:否、1:是)', `area_sequence` int(11) DEFAULT NULL COMMENT '區域序列', `area_parent_id` int(11) DEFAULT NULL COMMENT '上級主鍵', `init_date` timestamp NULL DEFAULT CURRENT_TIMESTAMP COMMENT '初始時間', PRIMARY KEY (`id`), KEY `parent_id` (`area_parent_id`) USING HASH) ENGINE=InnoDB AUTO_INCREMENT=900001 DEFAULT CHARSET=utf8 COMMENT='區域字典';

2.mybatis xml

<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>

根據上級主鍵查詢

3.頁面元素

<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="">請選擇或搜索省</option>   </select>  </div>  <div class="layui-input-inline">   <select id="city" lay-filter="city" lay-verify="required" lay-search="">     <option value="">請選擇或搜索市</option>   </select>  </div>  <div class="layui-input-inline">   <select id="area" lay-filter="area" lay-verify="required" lay-search="">     <option value="">請選擇或搜索縣/區</option>   </select>  </div>   <div class="layui-input-inline" style="width: 45%;">   <input class="layui-input" id="" lay-verify="required" placeholder="請輸入詳細地址：城鎮＋鄉村＋街道＋門牌號碼"></input>  </div></div>

4.js

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 = "";  //異步加載下拉框數據  $.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后必須從新渲染        form.render('select');      }    }   });   //監聽省下拉框  form.on('select(province)', function(dataObj){    //移除城市下拉框所有選項    $("#city").empty();    var cityHtml = '<option value="">請選擇或搜索市</option>';    $("#city").html(cityHtml);    var areaHtml = '<option value="">請選擇或搜索縣/區</option>';    $("#area").html(areaHtml);    provinceText = $("#province").find("option:selected").text();    var value = $("#province").val();    //異步加載下拉框數據    $.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后必須從新渲染          form.render('select');        }      }     });   });   //監聽市下拉框  form.on('select(city)', function(dataObj){    //移除縣區下拉框所有選項    $("#area").empty();    var html = '<option value="">請選擇或搜索縣/區</option>';    $("#area").html(html);     cityText = $("#city").find("option:selected").text();    var value = $("#city").val();    //異步加載下拉框數據    $.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后必須從新渲染          form.render('select');        }      }     });   });   //監聽縣區下拉框  form.on('select(area)', function(dataObj){    areaText = $("#area").find("option:selected").text();  });});