JavaScript實現下拉選單的級聯

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<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME=Generator CONTENT=EditPlus>
<META NAME=Author CONTENT=>
<META NAME=Keywords CONTENT=>
<META NAME=Description CONTENT=>
<style type=text/css>
body{font-family:Courier New, Courier}
select{font-size:8pt;font-family:Courier New, Courier}
input{font-size:8pt;font-family:Courier New, Courier}
</style>
<SCRIPT LANGUAGE=JavaScript>
<!–
var Name=new Array(3);
var Value=new Array(3);
Name[1]=new Array(Zosatapo1,Zosatapo2,Zosatapo3,Zosatapo4);
Name[2]=new Array(Reic Yang1,Reic Yang2,Reic Yang3,Reic Yang4);

function change()
{
selIndex=document.all(test).selectedIndex;
if(document.all(test).selectedIndex==0)
 return;

for(i=document.all(test).options.length-1;i>-1;i–)
{
 document.all(test).options.remove(i);
}

 

for(i=0;i<Name[selIndex].length;i )
{
document.all(test).options.add(new Option(Name[selIndex][i],name i));
}

}

function changeEx(){

for(i=document.all(sub).options.length;i>0;i–)
{
document.all(sub).options.remove(i-1);
}

if(document.all(main).selectedIndex==0){
document.all(sub).options.add(new Option(==========,-1));
return;}

selIndex=document.all(main).selectedIndex;

for(i=0;i<Name[selIndex].length;i )
{
document.all(sub).options.add(new Option(Name[selIndex][i],name i));
}

}

function reset(){
for(i=document.all(test).options.length-1;i>-1;i–)
{
 document.all(test).options.remove(i);
}

document.all(test).options.add(new Option(==========,-1));

document.all(test).options.add(new Option(Zosatapo,1));

document.all(test).options.add(new Option(Reic Yang,2));

}

function display(object){
alert(object.options[object.selectedIndex].text object.options[object.selectedIndex].value);
}
//–>
</SCRIPT>
</HEAD>

<BODY BGCOLOR=#FFFFFF>
First Sample:<br><font color=blue>All items will change After you Selected!</font><br>
<SELECT id=test  onchange=change();>
<option value=-1  selected>==========
<option  value=1>Zosatapo
<option  value=2>Reic Yang
</SELECT><input name=Reset Select type=button value=Reset Select onclick=reset(); ><br><br>

Second Sample:<br><font color=blue>You selected Item in Main Select will change the Sub select Content!</font><br>
Main Select:<SELECT id=main  onchange=changeEx();>
<option value=-1  selected>==========
<option  value=1>Zosatapo
<option  value=2>Reic Yang
</SELECT>

Sub Select:<SELECT id=sub onchange=display(this);>
<option value=-1  selected>==========
</SELECT><br><br>
</BODY>
</HTML>

 
 
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