But as of now CakePHP’s built-in AJAX features does not use JQuery, they are based on “prototype”. In the new version CakePHP, which is under development, they are planning to provide support for multiple JS libraries. But that is very less documented and not available for production ready sites.
To submit a form using AJAX in CakePHP, I just needed to write 3 lines of JS code and include two plug-ins of JQuery – “livequery” and “form”. That is it!