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在网上找到的代码，现在正在用，一定可以用。稍加改动，可以从数据库取数据进行联动，认为比较经典。
<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>
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注：只要把var array=new Array();的值改为从数据库中取到的值可以和数据库连接。例子如下。可以仿照进行更改
<script language="javascript">
//数据源
var array=new Array();
<%
int count = 0;
String bm_id="",bm_name="",yh_id="",yh_name="";
behdResultSet rs1=null,rs2=null;
String s1=null,s2=null;
s1="select dept_id,dept_name from scm_dept001";
s2="select dept_id,user_id,user_name from scm_user001 where dept_id!=' ' and dept_id!='null'";
rs1 = mdb.executeQueryForPage(s1,1,100);//读取数据
while(rs1.next())
{
bm_id=rs1.getString("dept_id");
bm_name=rs1.getString("dept_name");
%>
array[<%=count%>] = new Array("<%=bm_id%>","根目录","<%=bm_id%>-<%=bm_name%>");//产生数组
<%
count = count + 1;
}
rs2=mdb.executeQueryForPage(s2,1,100);
while(rs2.next()){
yh_id=rs2.getString("user_id");
if(yh_id==null){
yh_id="";
}
bm_id=rs2.getString("dept_id");
if(bm_id==null){
bm_id="";
}
yh_name=rs2.getString("user_name");
if(yh_name==null){
yh_name="";
}
%>
array[<%=count%>] = new Array("<%=yh_id%>","<%=bm_id%>","<%=yh_id%>-<%=yh_name%>");
<%
count = count + 1;
}
%>
//--------------------------------------------
//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
</script>
posted on 2006-11-29 11:41
yxw 阅读(412)
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