validate ajax populated form

[eluser]xpix[/eluser]
Hi all,

I was wondering if someone has an idea on how to validate a form that is populated with an ajax request based on a select field.

More info:

my page is index.php/form

in this page I have a form and a select field. When you pick a value I get the rest of the form from index.php/fillform/rest_of_the_fields_no using jquery's ajax method.

so now my form is

select field
field 1
field 2
field 3
submit button

How do I validate the 3 new fields?


My controller is looks like this

function index(){
//prepare form.
}
function fillform($rest_of_the_fields_no){
//prepare rest of the form.
}

Thank You