/*

** ==================================================================================================

** 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.οnchange=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

{

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]);

}

}

}

}

调用起来很方便，程序和HTML彻底分开，只要在页面上放上你需要的SELECT，其他的设置都只要在JS里写几行代码就行了

//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

//设置数据源

var liandong=new CLASS_LIANDONG_YAO(array)

//设置第一个选择框

liandong.firstSelectChange("根目录","s1");

//设置子级选择框

liandong.subSelectChange("s1","s2");

liandong.subSelectChange("s2","s3");

页面代码只要这样

下面是效果，提示：你可以修改再运行

/p>

Transitional//EN">

JS联动下拉框

content="FrontPage.Editor.Document">

/* ** ================================================================================================== ** 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.οnchange=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

{ 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]);

}

}

}

}

js在

target="_blank">这里

asp数据库调用在

href="http://www.21class.com/kehu/form/htmlpage1.asp"

target="_blank">这里

NAME="s1" >

selected>

NAME="s2" >

selected>

NAME="s3">

selected>

NAME="x1" >

selected>

NAME="x2" >

selected>

NAME="x3">

selected>

NAME="x4">

selected>

NAME="x5">

selected>

//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")