解决layui 三级联动下拉框更新时回显的问题

 <%--监听省份选择 --%> form.on('select(uprovinceId)', function(data){  initCityList('change');});

<script type="text/javaScript">layui.use(['form'],function(){  var form = layui.form;  <%--监听省份选择 --%>  form.on('select(uprovinceId)', function(data){  initCityList('change');});<%--监听城市选择 --%>  form.on('select(ucityId)', function(data){initDistrictList('change');});  <%--监听修改提交 --%>    form.on('submit(update)', function(data){   updateAccount();   form.render(); return false; //阻止表单跳转。如果需要表单跳转，去掉这段即可。});});<%-- 监听取消按钮 --%>$(document).on("click",".cancel",function(){ layer.closeAll("page");}); $(function(){<%--初始化省份列表 --%>initProvinceList('init');initCityList('init');initDistrictList('init');});<%--初始化省份列表 --%>function initProvinceList(flag){var provinceId = $("#oldProvinceId").val();$("#uprovinceId").append("<option value='" + -1 +"'>" + '请选择' + "</option>");$("#udistrictId").append("<option value='" + -1 + "'>" + '请选择' + "</option>");$("#ucityId").append("<option value='" + -1 + "'>" + '请选择' + "</option>");var url = "${ctx}/admin/getProvinceList.action?ranNum="+Math.random();$.post(url,{},function(data){var list = eval(data);       for (i = 0; i < list.length; i++) {         var name = list[i].province;         var id = list[i].id;         if(id == provinceId){         $("#uprovinceId").append("<option value='" + id + "' selected>" + name + "</option>");         }else{        $("#uprovinceId").append("<option value='" + id + "'>" + name + "</option>");         }       }      layui.use(['form'],function(){       var form = layui.form;       form.render();     });});}<%--初始化城市列表 --%>function initCityList(flag){var provinceId = $("#uprovinceId").val();var oldProvinceId = $("#oldProvinceId").val();if(provinceId == -1 && flag == "init"){provinceId = oldProvinceId; }var cityId = $("#oldCityId").val();$("#ucityId").empty();$("#ucityId").append("<option value='" + -1 + "'>" + '请选择' + "</option>");$("#udistrictId").empty();$("#udistrictId").append("<option value='" + -1 + "'>" + '请选择' + "</option>");var url = "${ctx}/admin/getCityList.action?ranNum="+Math.random();$.post(url,{provinceId:provinceId},function(data){var list = eval(data);alert(list.length+"list长度");       for (i = 0; i < list.length; i++) {         var name = list[i].city;         var id = list[i].id;         if(id == cityId){         $("#ucityId").append("<option value='" + id + "' selected>" + name + "</option>");         }else{        $("#ucityId").append("<option value='" + id + "'>" + name + "</option>");         }       }       layui.use(['form'],function(){       var form = layui.form;       form.render();     });});}<%--初始化区列表 --%>function initDistrictList(flag){var cityId = $("#ucityId").val();var oldCityId = $("#oldCityId").val();if(cityId == -1 && flag == "init"){cityId = oldCityId;}var districtId = $("#oldDistrictId").val();$("#udistrictId").empty();$("#udistrictId").append("<option value='" + -1 + "'>" + '请选择' + "</option>");var url = "${ctx}/admin/getDistrictList.action?ranNum="+Math.random();$.post(url,{cityId:cityId},function(data){var list = eval(data);       for (i = 0; i < list.length; i++) {         var name = list[i].district;         var id = list[i].id;         if( id == districtId){         $("#udistrictId").append("<option value='" + id + "' selected>" + name + "</option>");         }else{        $("#udistrictId").append("<option value='" + id + "'>" + name + "</option>");         }       }       layui.use(['form'],function(){       var form = layui.form;       form.render();     });});}</script>      <div class="layui-form-item city" style="margin-bottom: -8px;">      <label class="layui-form-label">所负责区域</label>      <div class="layui-inline">      <div class="layui-input-inline" style="width: 90px;margin-right: 0px;margin-bottom: 0px;">      <select id="uprovinceId" name="provinceId" lay-verify="required" lay-search="" lay-filter="uprovinceId">      <!-- <option value="-1">请选择</option> -->      </select>      </div>      </div>      <div class="layui-inline">      <div class="layui-input-inline" style="width: 90px;margin-right: 0px;margin-bottom: 0px;">      <select id="ucityId" name="cityId" lay-verify="required" lay-search="" lay-filter="ucityId" οnchange="initDistrictList()">      <!-- <option value="-1">请选择</option> -->      </select>      </div>      </div>      <div class="layui-inline">      <div class="layui-input-inline" style="width: 90px;margin-right: 0px;margin-bottom: 0px;">      <select id="udistrictId" name="districtId" lay-verify="required" lay-search="">      <!-- <option value="-1">请选择</option> -->      </select>      </div>      </div>      </div><input type = "hidden" value="${admin.provinceId }" id="oldProvinceId"><input type = "hidden" value="${admin.cityId }" id="oldCityId"><input type = "hidden" value="${admin.districtId }" id="oldDistrictId">