<SCRIPT LANGUAGE="JavaScript">
function Dsy()
{
this.Items={};
}
Dsy.prototype.add = function(id,iArray)
{
this.Items[id] = iArray;
}
Dsy.prototype.exisits = function(id)
{
if(typeof(this.Items[id]) == "undefined")
return false;
return true;
}
function change(v){
var str="0";
for(i=0;i<v;i++){
str+=("_"+(document.getElementById(s[i]).selectedIndex-1));};
//alert(str);
var ss=document.getElementById(s[v]);
//var s=["s1","s2","s3"];
//var opt0 = ["省份","地级市","县级市、县"];
with(ss){
ss.length = 0;
ss.options[0]=new Option(opt0[v],opt0[v]);
if(v && document.getElementById(s[v-1]).selectedIndex>0 || !v)
{
if(dsy.exisits(str)){
ss.ar = dsy.Items[str];
for(i=0;i<ar.length;i++)
ss.options[length]=new Option(ar[i],ar[i]);
if(v)
ss.options[1].selected = true;
}
}
if(++v<s.length){
change(v);
}
}
}
var dsy = new Dsy();
dsy.add("0",["安徽","北京","福建"]);
dsy.add("0_0",["安庆","蚌埠","巢湖","池州"]);
dsy.add("0_0_0",["安庆市","怀宁县","潜山县","宿松县","太湖县"]);
dsy.add("0_0_1",["蚌埠市","固镇县","怀远县","五河县"]);
dsy.add("0_0_2",["巢湖市","含山县","和县","庐江县","无为县"]);
dsy.add("0_0_3",["池州市","东至县","青阳县","石台县"]);
dsy.add("0_1",["北京"]);
dsy.add("0_1_0",["北京市","密云县","延庆县"]);
dsy.add("0_2",["福州","龙岩","南平"]);
dsy.add("0_2_0",["长乐市","福清市","福州市","连江县","罗源县","闽侯县"]);
dsy.add("0_2_1",["长汀县","连城县","龙岩市","上杭县","武平县","永定县"]);
dsy.add("0_2_2",["光泽县","建阳市","建瓯市","南平市","浦城县"]);
</SCRIPT>
<SCRIPT LANGUAGE = JavaScript>
var s=["s1","s2","s3"];
var opt0 = ["省份","地级市","县级市、县"];
function setup()
{
for(i=0;i<s.length-1;i++)
document.getElementById(s[i]).onchange=new Function("change("+(i+1)+")");
change(0);
}
</SCRIPT>
</head>
<body bgcolor="#E0E0E0" onload="setup()">
多级关联菜单：
<form name="frm">
<select id="s1"></select>
<select id="s2"></select>
<select id="s3"></select>
</form>
</body>
