学习javascript的时候都遇到过这样的需求,不仅是省市,还有其他的一些场景,看看关键的代码有哪些吧。

       

 1 <head runat="server">
 2     <title>省市级联效果</title>
 3     <script type="text/javascript">
 4         var cityList = [{ "province": "四川省", "city": ["成都", "内江", "绵阳", "眉山", "自贡"] },
 5         { "province": "山东省", "city": ["济南", "青岛", "德州", "淄博", "泰安", "菏泽", "临沂"] },
 6         { "province": "浙江省", "city": ["杭州", "金华", "绍兴", "温州", "衢州"] },
 7          { "province": "海南省", "city": ["海口", "三亚", "儋州", "东方", "五指山"] }, ];
 8 
 9 
10          window.onload = function () {
11              var province = document.getElementById("province");
12              //绑定事件
13              province.onchange = selectCity;
14          };
15 
16         function selectCity() {
17             //城市
18             var city = document.getElementById("city");
19             //先清空数据
20             if (city != null) {
21                 city.options.length = 0;
22             }
23 
24             //省份
25             var province = document.getElementById("province");
26             //获取选中省份的索引
27             var provinceSelectedIndex = province.selectedIndex;
28             //获取选中省份的项
29             var provinceSelectedOption = province.options[provinceSelectedIndex];
30 
31             //遍历城市列表
32             for (var i = 0; i < cityList.length; i++) {
33                 if (cityList[i].province == provinceSelectedOption.innerText) {
34                     for (var j = 0; j < cityList[i].city.length; j++) {
35                         //创建节点
36                         var optionNew = document.createElement("option");
37                         //为节点属性赋值
38                         optionNew.innerText = cityList[i].city[j];
39                         //添加节点
40                         city.appendChild(optionNew);
41                     }
42                 }
43             }
44         }
45     
46     </script>
47 </head>
48 <body>
49     <form id="form1" runat="server">
50     <div>
51         <select id="province" style="width: 200px;">
52             <option selected="selected">--请选择--</option>
53             <option>四川省</option>
54             <option>山东省</option>
55             <option>浙江省</option>
56             <option>海南省</option>
57         </select>
58         <select id="city" style="width: 200px;">
59         </select>
60     </div>
61     </form>
62 </body>
View Code

 

  效果图:

     

 2015年2月2日,改成代码版,原来是图片版。

 

 

posted on 2014-03-11 17:09  水语者9  阅读(228)  评论(0编辑  收藏  举报