基于layUI调用后台数据实现区域信息级联查询
1.基本思路
- 后台提供根据区域编码查询区域列表公共接口
- 页面初始化调用后台接口加载所有省份
- 点击省份将省份区域编码传入后台查询该省份下所有地市信息，以此类推
2.数据表结构展示
SELECT
COLUMN_NAME 列名,
DATA_TYPE 字段类型,
CHARACTER_MAXIMUM_LENGTH 长度,
IS_NULLABLE 是否为空,
COLUMN_COMMENT 备注
FROM
INFORMATION_SCHEMA. COLUMNS
WHERE
table_name = 'td_area';
3.数据详解
3.1.查看所有省份数据
select * from td_area t where t.level = 0 and t.parent_code = 0;
3.2.根据省份编码查询地市编码
以北京市为例，级别编码变为1，北京市的区域编码作为查询条件的父级编码，依次类推即可
select * from td_area t where t.level = 1 and t.parent_code = 110000000000;
3.3.脚本文件下载地址
https://download.csdn.net/download/u010427935/11604164
4.后端接口实现
我这里以Java实现的，单表查询就不贴具体代码了，这里只展示具体返回的json格式数据和入参数据
- 入参:就两个参数，级别编码和父级编码
- 响应部分json格式数据及截图
{
"code": 200,
"msg": "success",
"data": [
{
"level": 0,
"parentCode": 0,
"areaCode": 110000000000,
"zipCode": 0,
"cityCode": "",
"name": "北京市",
"shortName": "北京",
"mergerName": "北京",
"pinyin": "BeiJing",
"lng": 116.407526,
"lat": 39.90403
},
{
"level": 0,
"parentCode": 0,
"areaCode": 120000000000,
"zipCode": 0,
"cityCode": "",
"name": "天津市",
"shortName": "天津",
"mergerName": "天津",
"pinyin": "TianJin",
"lng": 117.200983,
"lat": 39.084158
}
]
}
5.前端具体代码
5.1.HTML页面,具体js和css修改为自己项目所在路径即可
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0,user-scalable=no"/>
<title>供应商系统</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link rel="shortcut icon" type="image/x-icon" href="#" />
<link rel="stylesheet" href="/lib/layui/css/layui.css" />
<script src="/js/jquery-3.2.1.min.js"></script>
<script src="/lib/layui/layui.js"></script>
<script src="../js/js-web-city.js"></script>
</head>
<body>
<fieldset class="layui-elem-field layui-field-title" style="margin-top: 20px;">
<legend>表单集合演示</legend>
</fieldset>
<form class="layui-form"> <div class="layui-form-item">
<label class="layui-form-label">联动选择框</label>
<div class="layui-input-inline">
<select name="quiz1" lay-filter="province" id="js-select-provice"></select>
</div>
<div class="layui-input-inline">
<select name="quiz2" lay-filter="city" id="js-select-city"></select>
</div>
<div class="layui-input-inline">
<select name="quiz3" lay-filter="county" id="js-select-county"></select>
</div>
<div class="layui-input-inline">
<select name="quiz3" lay-filter="street" id="js-select-street"></select>
</div><div class="layui-input-inline">
<select name="quiz3" id="js-select-village"></select>
</div>
</div>
</form> </body>
</html>
5.2.完整js调用代码
layui.use(['form'], function(){
var form = layui.form,layer = layui.layer
//监听省份选择
form.on('select(province)', function(data){
var selName = data.elem[data.elem.selectedIndex].text;
getCity(data.value);
form.render('select');//重新渲染下拉框
});
//监听地市选择
form.on('select(city)', function(data){
getCounty(data.value);
form.render('select');//重新渲染下拉框
});
//监听区县选择
form.on('select(county)', function(data){
getStreet(data.value);
form.render('select');//重新渲染下拉框
});
//监听乡镇选择
form.on('select(street)', function(data){
getVillage(data.value);
form.render('select');//重新渲染下拉框
});
//加载地市信息
function getCity(provinceCode) {
var areaData = queryArea(1,provinceCode);
if(null == areaData) {
return;
}
var resCode = areaData.code;
if(resCode == '200') {
$('#js-select-city').html('');
$('#js-select-county').html('');
$('#js-select-street').html('');
$('#js-select-village').html('');
var cityHtml = '<option value="" selected>请选择</option>'
$.each(areaData.data,function(index,val) {
cityHtml += '<option value="'+val.areaCode+'">'+val.name+'</option>';
})
$('#js-select-city').append(cityHtml);
}
}
//加载区县信息
function getCounty(cityCode) {
var areaData = queryArea(2,cityCode);
if(null == areaData) {
return;
}
var resCode = areaData.code;
if(resCode == '200') {
$('#js-select-county').html('');
$('#js-select-street').html('');
$('#js-select-village').html('');
var countyHtml = '<option value="" selected>请选择</option>'
$.each(areaData.data,function(index,val) {
countyHtml += '<option value="'+val.areaCode+'">'+val.name+'</option>';
})
$('#js-select-county').append(countyHtml);
}
}
//加载乡镇信息
function getStreet(countyCode) {
var areaData = queryArea(3,countyCode);
if(null == areaData) {
return;
}
var resCode = areaData.code;
if(resCode == '200') {
$('#js-select-street').html('');
$('#js-select-village').html('');
var streetHtml = '<option value="" selected>请选择</option>'
$.each(areaData.data,function(index,val) {
streetHtml += '<option value="'+val.areaCode+'">'+val.name+'</option>';
})
$('#js-select-street').append(streetHtml);
}
}
//加载街道信息
function getVillage(streetCode) {
var areaData = queryArea(4,streetCode);
if(null == areaData) {
return;
}
var resCode = areaData.code;
if(resCode == '200') {
$('#js-select-village').html('');
var villageHtml = '<option value="" selected>请选择</option>'
$.each(areaData.data,function(index,val) {
villageHtml += '<option value="'+val.areaCode+'">'+val.name+'</option>';
})
$('#js-select-village').append(villageHtml);
}
}
$(function () {
getProvince(0,0); //初始化加载省份信息
form.render('select');//重新渲染下拉框
});
});
function getProvince(level,code) {
var areaData = queryArea(level,code);
if(null == areaData) {
return;
}
var resCode = areaData.code;
if(resCode == '200') {
var provicetHtml = '<option value="" selected>请选择</option>'
$.each(areaData.data,function(index,val) {
provicetHtml += '<option value="'+val.areaCode+'">'+val.name+'</option>';
})
$('#js-select-provice').append(provicetHtml);
}
}
/**
* ajax查询区域信息，如果要去返回值信息设置为同步，默认为异步调用
* @param level
* @param code
* @returns {string}
*/
function queryArea(level,code) {
var resData = '';
$.ajax({
url: '../test/queryArea',
type: 'POST',
dataType: 'JSON',
async: false,
data: {
level: level,
parentCode: code
},
success: function(res) {
resData = res;
},
error: function(error) {
}
});
return resData;
}
5.3.js代码简单梳理
- 首选根据级别编码和区域编码查询后台公共方法，这里需要注意ajax异步调用无返回值得，需要设置为同步 async: false,
/**
* ajax查询区域信息，如果要去返回值信息设置为同步，默认为异步调用
* @param level
* @param code
* @returns {string}
*/
function queryArea(level,code) {
var resData = '';
$.ajax({
url: '../test/queryArea',
type: 'POST',
dataType: 'JSON',
async: false,
data: {
level: level,
parentCode: code
},
success: function(res) {
resData = res;
},
error: function(error) { }
});
return resData;
}
- 页面初始化加载所有省份信息
- 监听选择省份下拉框调用地市信息，选择地市加载区县依次类推即可