JS简单实现多级Select联动菜单效果代码

本文实例讲述了JS简单实现多级Select联动菜单效果代码。分享给大家供大家参考。具体如下：

JS联动菜单，简单代码实现JS多级Select联动菜单，也就是大家常用的一款菜单，Select联动状态的菜单，网页上经常见到的效果，希望大家能用得上。

运行效果截图如下：

在线演示地址如下：

http://demo.jb51.net/js/2015/js-simple-select-ld-menu-codes/

具体代码如下：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>JS联动下拉框</title>
<script language="javascript" >
/*
** ====================================
** 类名：CLASS_LIANDONG_YAO
** 功能：多级连动菜单
** 作者：YAODAYIZI
**/
 function CLASS_LIANDONG_YAO(array)
 {
 //数组，联动的数据源
  this.array=array;
  this.indexName='';
  this.obj='';
  //设置子SELECT
 // 参数：当前onchange的SELECT ID，要设置的SELECT ID
 this.subSelectChange=function(selectName1,selectName2)
  {
  //try
  //{
 var obj1=document.all[selectName1];
 var obj2=document.all[selectName2];
 var objName=this.toString();
 var me=this;
 obj1.onchange=function()
 {
  me.optionChange(this.options[this.selectedIndex].value,obj2.id)
 }
  }
  //设置第一个SELECT
 // 参数：indexName指选中项,selectName指select的ID
  this.firstSelectChange=function(indexName,selectName)
  {
  this.obj=document.all[selectName];
  this.indexName=indexName;
  this.optionChange(this.indexName,this.obj.id)
  }
 // indexName指选中项,selectName指select的ID
  this.optionChange=function (indexName,selectName)
  {
 var obj1=document.all[selectName];
 var me=this;
 obj1.length=0;
 obj1.options[0]=new Option("请选择",'');
 for(var i=0;i<this.array.length;i++)
 {
  if(this.array[i][1]==indexName)
  {
  //alert(this.array[i][1]+" "+indexName);
 obj1.options[obj1.length]=new Option(this.array[i][2],this.array[i][0]);
  }
 }
  }
 }
 </script>
</head>
<body>
<form name="form1" method="post">
   
  <SELECT ID="s1" NAME="s1" >
 <OPTION selected></OPTION>
  </SELECT>
  <SELECT ID="s2" NAME="s2" >
 <OPTION selected></OPTION>
  </SELECT>
  <SELECT ID="s3" NAME="s3">
 <OPTION selected></OPTION>
  </SELECT>
  <br>
  <br><br>
  <SELECT ID="x1" NAME="x1" >
 <OPTION selected></OPTION>
  </SELECT>
  <SELECT ID="x2" NAME="x2" >
 <OPTION selected></OPTION>
  </SELECT>
  <SELECT ID="x3" NAME="x3">
 <OPTION selected></OPTION>
  </SELECT>
  <SELECT ID="x4" NAME="x4">
 <OPTION selected></OPTION>
  </SELECT>
  <SELECT ID="x5" NAME="x5">
 <OPTION selected></OPTION>
  </SELECT>
 </form>
 </body>
<script language="javascript">
//例子1-------------------------------------------------------------
//数据源
var array=new Array();
 array[0]=new Array("华南地区","根目录","华南地区"); //数据格式 ID，父级ID，名称
 array[1]=new Array("华北地区","根目录","华北地区");
 array[2]=new Array("上海","华南地区","上海");
 array[3]=new Array("广东","华南地区","广东");
 array[4]=new Array("徐家汇","上海","徐家汇");
 array[5]=new Array("普托","上海","普托");
 array[6]=new Array("广州","广东","广州");
 array[7]=new Array("湛江","广东","湛江");
 //--------------------------------------------
 //这是调用代码
 var liandong=new CLASS_LIANDONG_YAO(array) //设置数据源
 liandong.firstSelectChange("根目录","s1"); //设置第一个选择框
 liandong.subSelectChange("s1","s2"); //设置子级选择框
 liandong.subSelectChange("s2","s3");
 //例子2-------------------------------------------------------------
 //数据源
 var array2=new Array();//数据格式 ID，父级ID，名称
 array2[0]=new Array("测试测试","根目录","测试测试");
 array2[1]=new Array("华北地区","根目录","华北地区");
 array2[2]=new Array("上海","测试测试","上海");
 array2[3]=new Array("广东","测试测试","广东");
 array2[4]=new Array("徐家汇","上海","徐家汇");
 array2[5]=new Array("普托","上海","普托");
 array2[6]=new Array("广州","广东","广州");
 array2[7]=new Array("湛江","广东","湛江");
 array2[8]=new Array("不知道","湛江","不知道");
 array2[9]=new Array("5555","湛江","555");
 array2[10]=new Array("++++","不知道","++++");
 array2[11]=new Array("111","徐家汇","111");
 array2[12]=new Array("222","111","222");
 array2[13]=new Array("333","222","333");
 //--------------------------------------------
 //这是调用代码
 //设置数据源
 var liandong2=new CLASS_LIANDONG_YAO(array2);
 //设置第一个选择框
 liandong2.firstSelectChange("根目录","x1");
 //设置子选择框
 liandong2.subSelectChange("x1","x2")
 liandong2.subSelectChange("x2","x3")
 liandong2.subSelectChange("x3","x4")
 liandong2.subSelectChange("x4","x5")
</script>
</html>

希望本文所述对大家的JavaScript程序设计有所帮助。