Cannot get AJAX to work for Post/Create

I cannot seem to find the form data being submitted. It hits the right controller and method though.

I should be able to access the form data like this right?

$this->request->getVar("description");

or even getPost, right?

Above is all null or blank.

The method does see the ajax as a post when I do this;

PHP Code:

        
if ($this->request->getMethod() == "post") {
            return $this->response->setJSON(json_encode('hello'));
} 


Any pointers appreciated.