本文实例为大家分享了JavaScript实现省市联动的具体代码,供大家参考,具体内容如下
实现效果:
2.选择省,后面跟本省对应的市
实现过程:
1.获得省的Dom对象
2.用循环为省的下拉菜单设置option子节点,并将数组每个pName的值赋给创建的子节点
3.每次循环同时为option子节点设置value属性
4.同理在点击省的同时,为市创建option子节点,并将cName的值赋给子节点,设置属性
实现细节:
1. 点击省时采用onchange事件(元素值改变时触发)
2. 每次为市增加节点,要将节点清空,否则市的节点会叠加,可采用option长度为0, citySel.options.length = 0;
- <!DOCTYPE html>
- <html lang="en">
- <head>
- <Meta charset="UTF-8">
- <title>Document</title>
- <style>
- .Box{
- width: 500px;
- padding: 20px;
- border: 1px solid #aaa;
- margin: 100px auto;
- }
- .Box select{
- width: 150px;
- margin: 10px;
- }
- </style>
- <script>
- var provs = [{"id":"01","pName":"河南省"},{"id":"02","pName":"河北省"},{"id":"03","pName":"四川省"}];
- var citys = [{"id":"001","cName":"安阳市","pId":"01"},{"id":"002","cName":"郑州市",{"id":"003","cName":"新乡市",{"id":"004","cName":"邯郸市","pId":"02"},{"id":"005","cName":"石家庄市",{"id":"006","cName":"合肥市",{"id":"007","cName":"广陵市","pId":"03"},{"id":"008","cName":"成都市",{"id":"009","cName":"重庆市","pId":"03"}];
- function $(id){
- return document.getElementById(id);
- }
- window.onload = function (){
- var proSel = $('province');
- for(var i = 0; i<provs.length; i++){
- var Coption = document.createElement('option');
- Coption.innerHTML = provs[i].pName;
- Coption.setAttribute('value',provs[i].id);
- proSel.appendChild(Coption);
- }
- proSel.onchange = function(){
- var city =$('city');
- var Pid = this.value;
- city.options.length = 0;//把Select的属性清空
- for(var i=0; i<citys.length; i++){
- if(Pid == citys[i].pId){
- var Noption = document.createElement('option');
- Noption.innerHTML = citys[i].cName;
- Noption.setAttribute('value',citys[i].id);
- city.appendChild(Noption);
- }
- }
- }
- }
- </script>
- </head>
- <body>
- <div class="Box">
- 请选择:
- <select id="province">
- <option value="00">----请选择----</option>
- </select><label for="province">省</label>
- <select id="city">
- <option value="000">----请选择----</option>
- </select><label for="city">市</label>
- </div>
- </body>
- </html>