Well, it took me practically the whole day to figure out why an ajaxSubmitButton was not posting the form to my AJAX action. I post this in order to save you some headaches in case you arrive to the same scenario. Lets say you have this in a view (PHP in pseudocode):
<div> <CActiveForm> <div> <TextBox> </div> </div> <div> <AjaxSubmitButton> </div> </CActiveForm>
So, if you nest the divs and form as I did, jQuery won’t find the <form> parent, thus the $_POST value will be empty. You need to nest things correctly:
<div> <CActiveForm> <div> <TextBox> </div> <div> <AjaxSubmitButton> </div> </CActiveForm> </div>
I hope this helps someone.