CODEIGNITER ROOKIE

[eluser]xzela[/eluser]
[quote author="Cro_Crx" date="1248474684"]
You'll need to create a callback function for your form validation class. Here's the link http://ellislab.com/codeigniter/user-gui...#callbacks
[/quote]

I think the form validation uses a form submit. Plus, the callback is only ran once a form has been submitted, which really isn't ajax.

You may want to read up on jQuery or script.aculo.us. They have some examples you can try in normal PHP. But Cro_Crx is right, you'll need to get the idea down before implementing it in CodeIgniter