JS 实现下拉框 省市区三级联动

今天刚好做了以下表单验证,发现网上比较基础的三级联动教程并不多,所以我出此以本。

效果如图:

 

HTML代码如下:

 1             <select name="province" onchange="getCity()">
 2                         <option value="0">所在省</option>
 3                         <option value="直辖市">直辖市</option>
 4                         <option value="广东省">广东省</option>
 5                         <option value="江苏省">江苏省</option>
 6                         <option value="福建省">福建省</option>    
 7                     </select>
 8                     <select name="city" onchange="getDistrict()">
 9                         <option value="0">所在市</option>
10                     </select>
11                     <select class="clear-Mar" name="district">
12                         <option value="0">所在区</option>
13                     </select>

 

JS代码如下:

 1 var city=[
 2    ["北京市","天津市","上海市","重庆市"],
 3    ["广州市","深圳市","珠海市","东莞市"],
 4    ["南京市","苏州市","南通市","常州市"],
 5    ["福州市","厦门市","莆田市","泉州市"]
 6    ];
 7 var district=[
 8     [
 9         ["东城区","西城区","宣武区"],["和平区","红桥区","塘沽区"],["杨浦区","徐汇区"],["万州区","涪陵区"]
10     ],
11     [
12         ["天河区","海珠区","白云区","番禺区"],["南山区","宝安区","福田区"],["香洲区","斗门区","金湾区"],["东城区","莞城区","万江区"]
13     ],
14     [
15         ['玄武区','白下区','秦淮区','建邺区'],['沧浪区','平江区','金阊区','虎丘区'],['崇川区','港闸区','海安县','如东县'],['天宁区','钟楼区','新北区']
16     ],
17     [
18         ['鼓楼区','台江区','仓山区','马尾区'],['思明区','海沧区','湖里区','集美区'],['城厢区','涵江区','荔城区','秀屿区'],['鲤城区','丰泽区','洛江区','泉港区']
19     ]
20 ];
21 function getCity(){
22     //获得省份下拉框的对象
23     var sltProvince=document.forms[0].province;
24     //获得城市下拉框的对象
25     var sltCity=document.forms[0].city;     
26     //获得市区下拉框的对象
27     var sltDistrict=document.forms[0].district;
28     //得到对应省份的城市数组
29     var provinceCity=city[sltProvince.selectedIndex - 1];  
30     //清空城市下拉框,仅留提示选项
31     sltCity.length=1;
32       sltDistrict.length=1;
33     //将城市数组中的值填充到城市下拉框中
34     for(var i=0;i<provinceCity.length;i++){
35        sltCity[i+1]=new Option(provinceCity[i],provinceCity[i]);
36     }
37 }
38 function getDistrict() {
39     var sltProvince=document.forms[0].province;
40      //获得城市下拉框的对象
41     var sltCity=document.forms[0].city;     
42     //获得市区下拉框的对象
43     var sltDistrict=document.forms[0].district;
44     //得到对应城市的市区数组
45     var cityDistrict=district[sltProvince.selectedIndex - 1][sltCity.selectedIndex - 1];
46     //清空城市下拉框,仅留提示选项
47     sltDistrict.length=1;
48     //将市区数组中的值填充到市区下拉框中
49     for(var i=0;i<cityDistrict.length;i++){
50        sltDistrict[i+1]=new Option(cityDistrict[i],cityDistrict[i]);
51     }
52 }

 

CSS不是重点就不给出了,如有疑问可以在下方评论......

 

posted @ 2017-04-20 20:01  vinpho  阅读(35116)  评论(2编辑  收藏  举报