求助:請問ASP如何實現二級聯動菜單?

用asp比較麻煩,每次更改都要提交再返回,所以壹般都是用javascript實現的...

<select id="a" onchange="change();">

</select>

<select id="b">

</select>

<script language="javascript">

var d=document.getElementById;

var arr1=new Array();

var arr2=new Array();

var i=0;

arr1[i++]="a";

arr1[i++]="b";

arr1[i++]="c";

i=0;

arr2[i++]=new Array("a1","a2","a3");

arr2[i++]=new Array("b1","b2","b3");

arr2[i++]=new Array("c1","c2","c3");

function change(){

var id=d("a").selectedIndex;

d("b").options.length=arr2[id].length;

for(var i=0;i<arr2[id].length;i++){

d("b").options[i]=new Option(arr2[id][i],i);

}

d("b").selectedIndex=0;

}

function initialize(){

d("a").options.length=arr1.length;

for(var i=0;i<arr1.length;i++){

d("a").options[i]=new Option(arr1[i],i);

}

d("a").selectedIndex=0;

change();

}

initialize();

</script>

使用的時候將大類和小類分別裝載到arr1和arr2兩個數組中即可..^_^..