本文实例为大家分享了layui实现省市区三级联动选择的具体代码，供大家参考，具体内容如下

省市区三级菜单联动插件

/**
 * @ name : citySelect 省市区三级选择模块
 * @ Author: aggerChen
 * @ version: 1.0
 */

layui.define(['layer','form','element','laytpl'], function(exports){
 var $ = layui.$;
 var form = layui.form;
 var laytpl = layui.laytpl;
 var element = layui.emelemt;
 
 //外部接口
 var citySelect = {
 config: {} //全局配置项
 ,cache: {} //数据缓存
 ,index: layui.laypage ? (layui.laypage.index + 10000) : 0
 };
 
 //操作当前实例
 var thisSelect = function(){
 var that = this,
 options = that.config,
 id = options.id;
 id && (thisSelect.config[id] = options);
 
 return {
 reload: function(options){
 that.reload.call(that, options);
 },
 config: options
 }
 };
 
 //字符常量
 var MOD_NAME = 'citySelect';
 
 //主模板
 var TPL_MAIN = ['<div class="layui-form-item" >',
 '<label class="layui-form-label">{{ d.data.lableName }}</label>',
 '<div class="layui-input-inline" style="width:160px">',
 '<select name="{{ d.data.filed.provinceName }}" class="{{ d.data.id }}_selectCity" id="citySelect_{{ d.data.filed.provinceName }}{{ d.index }}" lay-filter="province{{ d.index }}" {{#if(d.data.search){ }} lay-search {{# } }} {{#if(d.data.required){ }} lay-verify="required" {{# } }} {{#if(d.data.disabled){ }} disabled {{# } }} >',
 '<option value="000000">-- 全部 --</option>',
 '</select>',
 '</div>',
 '<div class="layui-input-inline" style="width:161px">',
 '<select name="{{ d.data.filed.cityName }}" class="{{ d.data.id }}_selectCity" id="citySelect_{{ d.data.filed.cityName }}{{ d.index }}" lay-filter="city{{ d.index }}" {{#if(d.data.search){ }} lay-search {{# } }} {{#if(d.data.required){ }} lay-verify="required" {{# } }} {{#if(d.data.disabled){ }} disabled {{# } }} >',
 '<option value="">-- 全部 --</option>',
 '</select>',
 '</div>',
 '{{# if(d.data.filed.area){ }}',
 '<div class="layui-input-inline" style="width:161px">',
 '<select name="{{ d.data.filed.areaName }}" class="{{ d.data.id }}_selectCity" id="citySelect_{{ d.data.filed.areaName }}{{ d.index }}" lay-filter="area{{ d.index }}" {{#if(d.data.search){ }} lay-search {{# } }} {{#if(d.data.required){ }} lay-verify="required" {{# } }} {{#if(d.data.disabled){ }} disabled {{# } }} >',
 '<option value="">-- 全部 --</option>',
 '</select>',
 '</div>',
 '{{# } }}',
 
 '{{# if(d.data.msg){ }}',
 '<div class="layui-form-mid layui-word-aux">{{ d.data.msg }}</div>',
 '{{# } }}',
 '</div>'
 ].join("");
 //选项模板
 var TPL_OPTION = [
 '<option value="">-- 全部 --</option>',
 '{{# layui.each(d.data,function(index,item){ }}',
 '<option class="ajaxOption" value="{{ item[d.options.filed.regionId] }}" {{#if(d.options.selectedArr.length>0 && ($.inArray(item[d.options.filed.regionId], d.options.selectedArr)!=-1)){ }} selected {{# } }} >{{ item[d.options.filed.regionName] }}</option>',
 '{{# }) }}'
 ].join("");
 
 
 //构造器
 var Class = function(options){
 var that = this;
 that.index = ++citySelect.index;
 that.config = $.extend(true,{}, that.config, citySelect.config, options);
 that.render();
 };
 
 //核心入口
 citySelect.render = function(options){
 var inst = new Class(options);
 return thisSelect.call(inst);
 };
 //获取选中值
 citySelect.values = function(id){
 return citySelect.cache[id]["values"]; //返回缓存中的选中值
 };
 //设置禁用/启用
 citySelect.disabled = function(id,flag){
 $("."+id+"_selectCity").attr("disabled",flag);
 };
 //重载
 thisSelect.config = {};
 citySelect.reload = function(id,options){
 var config = thisSelect.config[id];
 if(!config) return hint.error('The ID option was not found in the citySelect instance');
 return citySelect.render($.extend(true, {}, config, options));
 };
 
 //默认配置
 Class.prototype.config = {
 lableName : "行政区域",
 required : false, //是否必选
 search : true, //是否搜索
 msg:null, //默认附加信息
 selectedArr : [], //默认选中数组
 disabled:false, //禁用 默认不禁用
 filed:{
 area:true, //默认启用区
 regionId:'regionId', //默认字段id名
 regionName:'regionName',//默认字段name名
 provinceName: "province", //默认省份名称
 cityName : "city", //默认城市名称
 areaName : "area", //默认区县名称
 },
 
 };
 
 //加载容器
 Class.prototype.render = function(){
 var that = this;
 var options = that.config; 
 options.elem = $(options.elem);
 var othis = options.elem; 
 if(!options.elem[0]) return that; //如果元素不存在
 
 //请求参数的自定义格式
 options.request = $.extend({
 //pageName: 'page',
 //limitName: 'limit'
 }, options.request);
 
 //响应数据的自定义格式
 options.response = $.extend({
 statusName: 'code',
 statusCode: 0,
 msgName: 'msg',
 dataName: 'data',
 }, options.response);
 
 //主容器
 var reElem = that.elem = $(laytpl(TPL_MAIN).render({
 //VIEW_CLASS: ELEM_VIEW,
 data: options,
 index: that.index //索引
 }));
 othis.html(reElem); //生成主元素
 that.pullData(); //渲染初始
 that.formFilter(); //监听选择
 
 };
 
 //监听表单
 Class.prototype.formFilter = function(){
 var that = this;
 var options = that.config;
 that.key = options.id || options.index;
 
 //监听省
 form.on('select(province'+that.index+')', function(data){
 var cityDom = $("#citySelect_"+ options.filed.cityName + that.index); //市
 var areaDom = $("#citySelect_"+ options.filed.areaName + that.index); //区
 that.chearDom(cityDom); //清理市
 that.chearDom(areaDom); //清理区
 citySelect.cache[that.key]["values"][0] = data.value; //存入缓存
 citySelect.cache[that.key]["values"][1] = ""; //清理市级缓存
 citySelect.cache[that.key]["values"][2] = ""; //清理区级缓存
 if(data.value!=""){
 if(options.data){
 that.localData(cityDom, data.value); //本地渲染市级 
 }else{
 that.ajaxData(cityDom,data.value); //ajax渲染市
 }
 }
 }); 
 //监听市
 form.on('select(city'+that.index+')', function(data){
 var areaDom = $("#citySelect_"+ options.filed.areaName + that.index); //区
 that.chearDom(areaDom); //清理区
 citySelect.cache[that.key]["values"][1] = data.value;
 citySelect.cache[that.key]["values"][2] = "";
 if(data.value!=""){
 if(options.data){
 that.localData(areaDom, data.value); //本地渲染市级 
 }else{
 that.ajaxData(areaDom,data.value); //加载区
 }
 }
 }); 
 //监听区
 form.on('select(area'+that.index+')', function(data){
 citySelect.cache[that.key]["values"][2] = data.value;
 console.log("选择区"); //得到select原始DOM对象
 }); 
 
 };
 
 //渲染数据
 Class.prototype.pullData = function(){
 var that = this;
 var options = that.config;
 var dom = $("#citySelect_"+ options.filed.provinceName + that.index); //默认先渲染省
 that.key = options.id || options.index;
 citySelect.cache[that.key] = {values:["","",""]}; //记录values缓存标记
 
 if(options.data){ //data存在
 that.localData(dom,"000000");
 }else if(options.url){ //url存在
 that.ajaxData(dom);
 }
 
 };
 
 //data渲染数据
 Class.prototype.localData = function(dom,regionId){ 
 var that = this;
 var options = that.config;
 var regs = /^\d{2}0000$/; //验证省id 
 var regc = /^\d{4}00$/; //验证市ID
 if(regionId=="000000"){
 //渲染省级
 that.renderData(options.data,dom);
 }else if(regs.test(regionId)){
 //渲染市级
 $.each(options.data,function(index,item){
 if(regionId==item[options.filed.regionId]){
 that.renderData(item.children,dom);
 }
 });
 }else if(regc.test(regionId)){
 //渲染区级
 var sId = regionId.substr(0, 2)+"0000"; //获取省级Id
 $.each(options.data,function(index,item){
 if(sId==item[options.filed.regionId]){
 $.each(item.children,function(i,it){
 if(regionId==it[options.filed.regionId]){
 that.renderData(it.children,dom);
 }
 });
 }
 });
 }
 }
 
 
 //ajax获取数据
 Class.prototype.ajaxData = function(dom,regionId){
 var that = this;
 var options = that.config;
 var response = options.response;
 var params = {};
 params[options.filed.regionId] = regionId==undefined?"000000":regionId;
 
 //先查看缓存有没有
 if(citySelect.cache[that.key][regionId]!=undefined ){
 that.renderData(citySelect.cache[that.key][regionId],dom);
 }else{
 $.ajax({
 type: options.method || 'get',
 url: options.url,
 data: $.extend(params, options.where),
 dataType: 'json',
 success: function(res){
 if(res[response.statusName] != response.statusCode){
 that.renderForm();
 typeof options.error === 'function' && options.error(res);
 return ;
 }
 var data = res[options.response.dataName] || [];
 that.renderData(data,dom);
 if(data.length>0){
 citySelect.cache[that.key][regionId] = data; //将已经获取的数据保存缓存
 }
 options.time = (new Date().getTime() - that.startTime) + ' ms'; //耗时（接口请求+视图渲染）
 typeof options.done === 'function' && options.done(res);
 }
 ,error: function(e, m){
 that.renderData('<option value="">数据接口请求异常</option>',dom);
 typeof options.error === 'function' && options.error(res, e,m);
 }
 });
 }
 
 };
 
 //数据渲染
 Class.prototype.renderData = function(data,dom){
 var that = this,
 options = that.config;
 var selectedArr = options.selectedArr; //获取默认选中数组
 
 if(typeof data === 'string'){
 $(dom).html(data);
 }else{
 //渲染选择项
 $(dom).html( $(laytpl(TPL_OPTION).render({
 data: data,
 options:options,
 index: that.index //索引
 })));
 that.renderForm('select');
 }
 //设置默认选中
 var v = $(dom).val();
 if(v!=""&&selectedArr.length>0){
 for (var i = 0; i < selectedArr.length; i++) {
 if(v == selectedArr[i] && i<3){
 citySelect.cache[that.key]["values"][i] = v; //保存到选中缓存
 that.config.selectedArr[i] = ""; //清除默认选择数组
 if(i==0){
 var dom = $("#citySelect_"+ options.filed.cityName + that.index);
 if(options.data){
 that.localData(dom, v); //本地渲染市级 
 }else{
 that.ajaxData(dom, v); //ajax渲染市级
 }
 }else if(i==1&&options.filed.area){
 var dom = $("#citySelect_"+ options.filed.areaName + that.index);
 if(options.data){
 that.localData(dom, v); //本地渲染区级 
 }else{
 that.ajaxData(dom, v); //ajax渲染区级
 }
 }
 }
 }
 }
 };

 
 //渲染表单
 Class.prototype.renderForm = function(type){
 form.render(type);
 };
 
 //清空select
 Class.prototype.chearDom = function(dom){
 var that = this;
 $(dom).html('');
 $(dom).append('<option value="">-- 全部 --</option>');
 that.renderForm('select');
 };
 
 //暴露模块
 exports(MOD_NAME, citySelect);
});