本文实例为大家分享了jQuery实现简单三级联动的具体代码,供大家参考,具体内容如下
首先写一个JSON数据
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[
{
"province" : "吉林省" ,
"cities" : [
{
"city" : "长春市" ,
"counties" : [ "朝阳区" , "经济开发区" , "高新区" ]
},
{
"city" : "吉林市" ,
"counties" : [ "东城区" , "经济开发区" , "老城区" ]
},
{
"city" : "白山市" ,
"counties" : [ "二道区" , "河东区" , "高新区" ]
}
]
},
{
"province" : "辽宁省" ,
"cities" : [
{
"city" : "沈阳市" ,
"counties" : [ "朝阳区" , "经济开发区" , "高新区" ]
},
{
"city" : "大连市" ,
"counties" : [ "东城区" , "经济开发区" , "老城区" ]
},
{
"city" : "铁岭市" ,
"counties" : [ "二道区" , "河东区" , "高新区" ]
}
]
},
{
"province" : "山东省" ,
"cities" : [
{
"city" : "青岛市" ,
"counties" : [ "朝阳区" , "经济开发区" , "高新区" ]
},
{
"city" : "济南市" ,
"counties" : [ "东城区" , "经济开发区" , "老城区" ]
},
{
"city" : "威海市" ,
"counties" : [ "二道区" , "河东区" , "高新区" ]
}
]
}
]
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然后用Ajax动态获取JSON文件中的数据
完整代码
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<!DOCTYPE html>
< html lang = "en" >
< head >
< meta charset = "UTF-8" />
< meta name = "viewport" content = "width=device-width, initial-scale=1.0" />
< title >三级联动</ title >
</ head >
< body >
<!-- 三级联动 - 两个二级联动 -->
< select id = "province" >
< option value = "" >---</ option >
</ select >
< select id = "city" >
< option value = "" >---</ option >
</ select >
< select id = "county" >
< option value = "" >---</ option >
</ select >
< script src = "js/jquery-1.12.4.js" ></ script >
< script src = "../js/createXMLHttpRequest.js" ></ script >
< script >
var $province = $("#province");
var $city = $("#city");
var $county = $("#county");
var json;
$.getJSON("data/server1.json", function (data) {
// 把data保存到json全局变量中
json = data;
// 遍历data数据
$.each(data, function (index, obj) {
// 获取所有的省份信息
var provinceName = obj.province;
// console.log(provinceName);
// 将省份信息添加到对应的select元素中
$province.append(
`< option value = "${provinceName}" >${provinceName}</ option >`
);
});
$province.change(function () {
// 将城市下拉列表的选项清空
$city.empty();
$city.append(`< option value = "" >---</ option >`);
// 获取到所选择的城市的文本信息
var provinceElementName = $(this).children("option:selected").text();
// console.log(provinceElementName);
$.each(json, function (index, obj) {
var provinceName = obj.province;
// console.log(provinceName);
if (provinceElementName === provinceName) {
// 获取到城市数组集合
var cities = obj.cities;
// 遍历城市数组集合
$.each(cities, function (index, obj) {
// console.log(obj.city);
// 获取到城市名称
var cityName = obj.city;
// 将该省对应的城市名称添加到对应的select中
$city.append(
`< option value = "${cityName}" >${cityName}</ option >`
);
});
}
});
});
$city.change(function () {
// 将区级下拉列表的选项清空
$county.empty();
$county.append(`< option value = "" >---</ option >`);
// 获取到所选择的城市的文本信息
var cityElementName = $(this).children("option:selected").text();
// console.log(cityElementName);
$.each(json, function (index, obj) {
// 获取该省对应的所有的城市信息
var cities = obj.cities;
// console.log(cities);
$.each(cities, function (index, cityObj) {
// console.log(cityObj.city);
var cityName = cityObj.city;
if (cityElementName === cityName) {
// 获取到区级数组集合
// console.log(cityObj.counties);
var counties = cityObj.counties;
// 遍历区级数组集合
$.each(counties, function (index, value) {
// 获取到区级名称
// console.log(value);
// 将该城市对应的区级名称添加到对应的select元素中
$county.append(`< option value = "${value}" >${value}</ option >`);
});
}
});
});
});
});
</ script >
</ body >
</ html >
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效果如下
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/Cool_breeze_/article/details/108391452