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:

1.当点击文字时选中对应的下拉菜单

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","pId":"01"},{"id":"003","cName":"新乡市","pId":"01"},{"id":"004","cName":"邯郸市","pId":"02"},{"id":"005","cName":"石家庄市","pId":"02"},{"id":"006","cName":"合肥市","pId":"02"},{"id":"007","cName":"广陵市","pId":"03"},{"id":"008","cName":"成都市","pId":"03"},{"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>

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