像平时购物选择地址时一样,通过选择的省动态加载城市列表,通过选择的城市动态加载县区列表,从而可以实现省市县的三级联动,下面使用原生的JavaScript来实现这个功能:
先给大家展示下测试结果:
未做任何选择时:
选择时:
代码如下所示:
<!DOCTYPE html><html><head lang="en"><meta charset="UTF-8"><title>三级联动测试</title><script src="jquery-2.1.4.min.js"></script><script type="text/javascript">//用来获得option元素中selected属性为true的元素的idfunction Get_Selected_Id(place){var pro = document.getElementById(place);var Selected_Id = pro.options[pro.selectedIndex].id;return Selected_Id; //返回selected属性为true的元素的id}//改变下一个级联的option元素的内容,即加载市或县function Get_Next_Place(This_Place_ID,Action){var Selected_Id = Get_Selected_Id(This_Place_ID); //Selected_Id用来记录当前被选中的省或市的IDif(Action=='Get_city') //从而可以在下一个级联中加载相应的市或县Add_city(Selected_Id);else if(Action=='Get_country')Add_country(Selected_Id);}//用来存储省市区的数据结构var Place_dict = {"GuangDong":{"GuangZhou":["PanYu","HuangPu","TianHe"],"QingYuan":["QingCheng","YingDe","LianShan"],"FoShan":["NanHai","ShunDe","SanShui"]},"ShanDong":{"JiNan":["LiXia","ShiZhong","TianQiao"],"QingDao":["ShiNan","HuangDao","JiaoZhou"]},"HuNan":{"ChangSha":["KaiFu","YuHua","WangCheng"],"ChenZhou":["BeiHu","SuXian","YongXian"]}};//加载城市选项function Add_city(Province_Selected_Id){$("#city").empty();$("#city").append("<option>City</option>");$("#country").empty();$("#country").append("<option>Country</option>");//上面的两次清空与两次添加是为了保持级联的一致性var province_dict = Place_dict[Province_Selected_Id]; //获得一个省的字典for(city in province_dict){ //取得省的字典中的城市//添加内容的同时在option标签中添加对应的城市IDvar text = "<option"+" id='"+city+"'>"+city+"</option>";$("#city").append(text);console.log(text); //用来观察生成的text数据}}//加载县区选项function Add_country(City_Selected_Id){$("#country").empty();$("#country").append("<option>Country</option>");//上面的清空与添加是为了保持级联的一致性var Province_Selected_ID = Get_Selected_Id("province"); //获得被选中省的ID,从而方便在字典中加载数据var country_list = Place_dict[Province_Selected_ID][City_Selected_Id]; //获得城市列表for(index in country_list){////添加内容的同时在option标签中添加对应的县区IDvar text = "<option"+" id=/'"+country_list[index]+"/'>"+country_list[index]+"</option>";$("#country").append(text);console.log(text); //用来观察生成的text数据}}</script></head><body><p>您的收货地址:</p><select id="province" onchange="Get_Next_Place('province','Get_city')"><option id="Not_data1">Province</option><option id="GuangDong" value="GuangDong">GuangDong</option><option id="ShanDong" value="ShanDong">ShanDong</option><option id="HuNan" value="HuNan">HuNan</option></select><select id="city" onchange="Get_Next_Place('city','Get_country')"><option id="Not_data2">City</option></select><select id="country"><option id="Not_data3">Country</option></select><br/></body></html>
当然,省市县三者都是动态联动的,只要顶级的内容发生改变,所有子级的内容也会发生改变或被重置为City或Country.
以上所述是小编给大家分享的原生JavaScript实现动态省市县三级联动下拉框菜单实例代码,希望对大家有所帮助。
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