当学校（s1）选择“其他”时，所在校区(列表框s2),所在宿舍（列表框s3）隐藏起来，出现一个文本框（s4）用来填其他地址，请问这个功能如果实现呢？
<html>
<head>
<title>网页特效|Linkweb.cn/Js|---无刷新多级关联菜单</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"><style>
body,select
{
font-size:9pt;
font-family:Verdana;
}
a
{
color:red;
text-decoration:none;
}
a:hover{
text-decoration:underline;
}
</style>
<SCRIPT LANGUAGE="JavaScript">
<!--
function Dsy()
{
this.Items = {};
}
Dsy.prototype.add = function(id,iArray)
{
this.Items[id] = iArray;
}
Dsy.prototype.Exists = 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));};
var ss=document.getElementById(s[v]);
with(ss){
length = 0;
options[0]=new Option(opt0[v],opt0[v]);
if(v && document.getElementById(s[v-1]).selectedIndex>0 || !v)
{
if(dsy.Exists(str)){
ar = dsy.Items[str];
for(i=0;i<ar.length;i++)options[length]=new Option(ar[i],ar[i]);
if(v)options[1].selected = true;
}
}
if(++v<s.length){change(v);}
}
}var dsy = new Dsy();dsy.add("0",["中山大学1","广州大学","其 他"]);dsy.add("0_0",["大学城校区"]);
dsy.add("0_0_0",["至1栋","至2栋"]);dsy.add("0_1",["大学城校区"]);
dsy.add("0_1_0",["B1栋","B2栋"]);
//-->
</SCRIPT>
<SCRIPT LANGUAGE = JavaScript>
<!--
//** Power by Fason(2004-3-11)
//** Email:[email protected] s=["s1","s2","s3"];
var opt0 = ["请选择学校","请选择校区","请选择宿舍"];
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" action="shiqu.asp">
<select name="s1" id="s1"><option>请选择学校</option></select>
<select name="s2" id="s2"><option>请选择校区</option></select>
<select name="s3" id="s3"><option>请选择宿舍</option></select>
</form>
</body>
</html>
<html>
<head>
<title>网页特效|Linkweb.cn/Js|---无刷新多级关联菜单</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"><style>
body,select
{
font-size:9pt;
font-family:Verdana;
}
a
{
color:red;
text-decoration:none;
}
a:hover{
text-decoration:underline;
}
</style>
<SCRIPT LANGUAGE="JavaScript">
<!--
function Dsy()
{
this.Items = {};
}
Dsy.prototype.add = function(id,iArray)
{
this.Items[id] = iArray;
}
Dsy.prototype.Exists = 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));};
var ss=document.getElementById(s[v]);
with(ss){
length = 0;
options[0]=new Option(opt0[v],opt0[v]);
if(v && document.getElementById(s[v-1]).selectedIndex>0 || !v)
{
if(dsy.Exists(str)){
ar = dsy.Items[str];
for(i=0;i<ar.length;i++)options[length]=new Option(ar[i],ar[i]);
if(v)options[1].selected = true;
}
}
if(++v<s.length){change(v);}
}
}var dsy = new Dsy();dsy.add("0",["中山大学1","广州大学","其 他"]);dsy.add("0_0",["大学城校区"]);
dsy.add("0_0_0",["至1栋","至2栋"]);dsy.add("0_1",["大学城校区"]);
dsy.add("0_1_0",["B1栋","B2栋"]);
//-->
</SCRIPT>
<SCRIPT LANGUAGE = JavaScript>
<!--
//** Power by Fason(2004-3-11)
//** Email:[email protected] s=["s1","s2","s3"];
var opt0 = ["请选择学校","请选择校区","请选择宿舍"];
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" action="shiqu.asp">
<select name="s1" id="s1"><option>请选择学校</option></select>
<select name="s2" id="s2"><option>请选择校区</option></select>
<select name="s3" id="s3"><option>请选择宿舍</option></select>
</form>
</body>
</html>
<html>
<head>
<title>网页特效|Linkweb.cn/Js|---无刷新多级关联菜单 </title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <style>
body,select
{
font-size:9pt;
font-family:Verdana;
}
a
{
color:red;
text-decoration:none;
}
a:hover{
text-decoration:underline;
}
</style>
<SCRIPT LANGUAGE="JavaScript">
<!--
function Dsy()
{
this.Items = {};
}
Dsy.prototype.add = function(id,iArray)
{
this.Items[id] = iArray;
}
Dsy.prototype.Exists = function(id)
{
if(typeof(this.Items[id]) == "undefined") return false;
return true;
} function change(v){
var str="0";
if(document.getElementById("s1").value=="其 他") {
document.getElementById("s2").style.display="none";
document.getElementById("s3").style.display="none";
document.getElementById("s4").style.display="";
} else {
document.getElementById("s2").style.display="";
document.getElementById("s3").style.display="";
document.getElementById("s4").style.display="none";
}
for(i=0;i <v;i++){ str+=("_"+(document.getElementById(s[i]).selectedIndex-1));};
var ss=document.getElementById(s[v]);
with(ss){
length = 0;
options[0]=new Option(opt0[v],opt0[v]);
if(v && document.getElementById(s[v-1]).selectedIndex>0 || !v)
{
if(dsy.Exists(str)){
ar = dsy.Items[str];
for(i=0;i <ar.length;i++)options[length]=new Option(ar[i],ar[i]);
if(v)options[1].selected = true;
}
}
if(++v <s.length){change(v);}
}
} var dsy = new Dsy(); dsy.add("0",["中山大学1","广州大学","其 他"]); dsy.add("0_0",["大学城校区"]);
dsy.add("0_0_0",["至1栋","至2栋"]); dsy.add("0_1",["大学城校区"]);
dsy.add("0_1_0",["B1栋","B2栋"]);
//-->
</SCRIPT>
<SCRIPT LANGUAGE = JavaScript>
<!--
//** Power by Fason(2004-3-11)
//** Email:[email protected] var s=["s1","s2","s3"];
var opt0 = ["请选择学校","请选择校区","请选择宿舍"];
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" action="shiqu.asp">
<select name="s1" id="s1"> <option>请选择学校 </option> </select>
<select name="s2" id="s2"> <option>请选择校区 </option> </select>
<select name="s3" id="s3"> <option>请选择宿舍 </option> </select>
<input name="s4" id="s4" style="display:none">
</form>
</body>
</html>