Add option for callback function to be executed with 'Evaluate' button is clicked

[dude-at-RA]

I'd like to include quizdown-js in SCORM modules that report back to a Learning Management System. The big hurdle is getting the 'grade' to JS outside of the quizdown object when the user is ready to evaluate.

I'm looking for suggestions as to how to accomplish this. I am thinking about:

• adding a callback option to the quizdown options object that eventually adds that callback function to the Evaluate button, or
• creating an public function that can be called to get the grade.