DropDown Menu Affecting other DropDown Menu

[danrevah]

How can I make something like that:
I will have 3 dropdown menus
First Dropdown menu will be: Class
Second Dropdown menu will be: Area

Third Dropdown menu will be: options that will change

3 Examples:

1. if I choose on "Class" Dropdown menu the option "A"
It will show on the the Third Drop down
"A1","A2","A3"
2. if I choose on "Class" Dropdown menu the option "B"
It will show on the the Third Dropdown
"Y1","Y2","Y3"
3. if I choose on "Class" Dropdown menu the option "A" and on "Area" dropdown menu the option "Center"
It will show on the the Third Dropdown
"X1","X2","X3"

And I need to get the categories from Database..

How can it be done?

[rguy84]

one way is: Felgall Javascript - Dynamic Dropdown Boxes

[danrevah]

Thanks!
Its working.. althought I took me like a hour to make it work
and it looks really messy...

Is there a better way than that?
since im printing all the possible if/else if statements.. and it looks kinda messy..