Updating AJAX quiz to utilize ajax framework and changing the use of args()

(Hmm, not sure the best category for this. a Task?)

I know that there are numerous other tickets in the issue queue around this topic. For my project I needed to have ajax_quiz working.

I've worked on two patches that allow ajax_quiz to work in a way that utilizes the Drupal 7 AJAX framework and callbacks. There are two patches.

Patch 1: 2464087-quiz-quiz_questions-remove-args-1.patch

This patch removes the use of arg() from the various form functions used by the quiz_question.module . By using arg() (ex: arg(1), arg(3)) assumptions are being made about the url sturucture, which might not hold true (especially with the use of ajax callbacks. The data being retrieved from these arg() calls can be retrieved by other means.

The value attempting to be retrieved from arg(1) is the quiz nid. This patch adds the quiz nid & vid to the quiz_question_answering_form form object and places them in #quiz. This allows for all other form calls (the validation and submission functions) to retrieve the quiz from the form object.

The value attempting to be retrieve from arg(3) is a question number. This patch instead retrieves this from the $_SESSION['quiz'][]['current'] value.

Patch 2: 2464087-quiz-ajax_quiz-use-ajax-framework-1.patch

This patch requires patch 1. This patch updates ajax_quiz.module to add a wrapping div to the quiz_question_answering_form as well as ajax callbacks to all submission navigation buttons. When submitted the Drupal 7 AJAX framework will call a custom callback (function added to the ajax_quiz.module) which is triggered after the form validation/submission function. The callback implements logic to retrieve the correct question and re-render the form, as well as, update the quiz progress. It also handles redirecting the user to the final results page.

With this method the files ajax_quiz.admin.inc, ajax_quiz.js can be removed (but I have not removed them).

I've only done limited testing on these patches but they work for answering quiz questions, leaving questions blank and traversing bakcwards on a quiz.

I welcome input and feedback.