Form validate question ?

[eluser]nebi[/eluser]
Hi,

I coding a page there user can build forms . Now i want make so that the user can select wich field that is required , so wonder a easy way in the controller to validate the form without knowing the name of the field and what type of form (example checkbox,text etc..) , like the validation is looking for class="required" in the form or something like that.


Thanks in advance