Web页面实现三级联动
最近项目里面有一个功能需要使用三级联动来实现,但是项目中又没有很好的 demo 来实现这个功能,于是乎自己手敲了一个简单的三级联动的代码,记录一下。时间仓促,代码中还有很多地方可以优化。
<div class="row">
<div class="col-sm-6">
<select id="province" name="province" class="chosen-select form-control m-b" tabindex="1">
<option>===请选择===</option>
</select>
</div>
<span style="color: red; font-size: 23px">*</span>
<small>[ 省 ]</small>
</div>
<br>
<div class="row">
<div class="col-sm-6">
<select id="city" name="city" class="chosen-select form-control m-b" tabindex="1">
<option>===请选择===</option>
</select>
</div>
<span style="color: red; font-size: 23px">*</span>
<small>[ 市 ]</small>
</div>
<br>
<div class="row">
<div class="col-sm-6">
<select id="district" name="district" class="chosen-select form-control m-b" tabindex="1">
<option>===请选择===</option>
</select>
</div>
<span style="color: red; font-size: 23px">*</span>
<small>[ 区 ]</small>
</div>
<br>
<script type="text/javascript">
var province_id = '1000';
var city_id ='1100';
var district_id = '1110';
// 初始化省
initAddress();
function initAddress() {
$.ajax({
type:'GET',
url:'${contextPath}/test/get_province',
success:function(data) {
$.each(data.data, function(key, value) {
$("#province").append("<option value='"+key+"'>" + value + "</option>");
});
//回显数据
if (province_id != null) {
$("#province option").each(function () {
if ($(this).val() == province_id){
$(this).attr("selected", true);
getCity(province_id)
}
})
}
}
});
}
function getCity(province_id) {
$("#city").find("option").remove();
$.ajax({
type:'GET',
url:'${contextPath}/test/get_city',
data:{
province_id:province_id
},
success:function(data) {
$("#city").append("<option value=''>" + '===请选择===' + "</option>");
$.each(data.data, function(key, value) {
$("#city").append("<option value='"+key+"'>" + value + "</option>");
});
//回显数据
if (city_id != null) {
$("#city option").each(function () {
if ($(this).val() == city_id){
$(this).attr("selected", true);
getDistrict(city_id)
}
})
}
}
});
}
function getDistrict(city_id) {
$("#district").find("option").remove();
$.ajax({
type:'GET',
url:'${contextPath}/test/get_district',
data:{
city_id:city_id
},
success:function(data) {
$("#district").append("<option value=''>" + '===请选择===' + "</option>");
$.each(data.data, function(key, value) {
$("#district").append("<option value='"+key+"'>" + value + "</option>");
});
//回显数据
if (district_id != null) {
$("#district option").each(function () {
if ($(this).val() == district_id)
$(this).attr("selected", true);
})
}
}
});
}
//change事件监听province改变,获取该省份下面的市
$("#province").change(function() {
var province_id = $("#province option:selected").val();
getCity(province_id);
getDistrict(null);
});
//change事件监听city改变,获取该省份下面的市
$("#city").change(function() {
var city_id = $("#city option:selected").val();
getDistrict(city_id);
});
</script>
Java 后台代码
/**
* 获取省
*
* @return
*/
@ResponseBody
@RequestMapping("/get_province")
public JSONResultDTO get_province() {
Map<String, String> provinceMap = new HashMap<>(4);
provinceMap.put("1000","江苏省");
provinceMap.put("2000","山东省");
return createSuccessResult(provinceMap);
}
/**
* 获取市
*
* @return
*/
@ResponseBody
@RequestMapping("/get_city")
public JSONResultDTO get_city(String province_id) {
Map<String, String> provinceMap = new HashMap<>(4);
if (province_id.equals("1000")) {
provinceMap.put("1100", "南京市");
provinceMap.put("1200", "无锡市");
}
if (province_id.equals("2000")) {
provinceMap.put("2100", "济南市");
provinceMap.put("2200", "青岛市");
}
return createSuccessResult(provinceMap);
}
/**
* 获取区
*
* @return
*/
@ResponseBody
@RequestMapping("/get_district")
public JSONResultDTO get_district(String city_id) {
Map<String, String> cityMap = new HashMap<>(8);
if (city_id.equals("1100")) {
cityMap.put("1110", "浦口区");
cityMap.put("1120", "鼓楼区");
}
if (city_id.equals("1200")) {
cityMap.put("1210", "崇安区");
cityMap.put("1220", "滨湖区");
}
if (city_id.equals("2100")) {
cityMap.put("2110", "历下区");
cityMap.put("2120", "市中区");
}
if (city_id.equals("2200")) {
cityMap.put("2210", "市南区");
cityMap.put("2220", "市北区");
}
return createSuccessResult(cityMap);
}
三级联动的关键代码就是这几行:
$.each(data.data, function(key, value) {
$("#province").append("<option value='"+key+"'>" + value + "</option>");
});
//回显数据
if (province_id != null) {
$("#province option").each(function () {
if ($(this).val() == province_id){
$(this).attr("selected", true);
getCity(province_id)
}
})
}
循环后台的数据,append
到对应的下拉列表框中,然后下面循环下拉数据和变量比较,用于编辑页面的数据回显。对比后将其设置为 selected
并且调用下一级的查询。
本文由个人 hexo 博客 co2fe.com 迁移
date: 2018-10-26 09:44:19