Making a textarea "Required" that uses ck editor

Hi,

I'm having issues trying to prevent users from skipping the ck editor textareas on a form. They are set as required in the form tagging.

I've searched the documentation and found the following info

http://docs.ckeditor.com/#!/api/CKEDITOR.editor-event-required

However I'm unsure how to implement this. If someone could advise how to add this validation that would be much appreciated.