Links to show Coursera lecture quizzes only

quizzes-only.js

/*

On the coursera lecture index, execute this Javascript (via greasemonkey script, bookmarklet, etc) to show 'quizzes' links next to each lecture. Clicking it will open the lecture, but instead of showing the video, will:
1. Pause it
2. Show the first quiz
3. Upon clicking "skip" or "continue" on the quiz, proceed to the next
4. Repeat from 3.
5. Continue showing the video

Having watched a downloaded video, you can now easily do the in-lecture quizzes separately.

(Note: attemptToShow can probably be replaced by some appropriate event handling. And I haven't worked out how to nicely avoid step 5, by closing the video on completion of the last quiz. Extensions welcome!)

*/

(function() {
function showQuizzes() {
  var el = document.getElementById('fancybox-frame');
  if (!el)
    return false;
  var w = el.contentWindow, player = w.QL_player;
  if (!player || !player.cue_points_installed)
    return false;
  player.mediaelement_handle.pause();
  w.quiz_cue_point_queue = player.cue_points.slice();
  w.continue_to_next_quiz(player.mediaelement_handle);
  return true;
}
function attemptToShow() {
  if (!showQuizzes()) {
    setTimeout(attemptToShow, 100);
  }
}
$('<a href="#">quizzes</a>')
  .click(function(ev) {
    var ll = $(ev.target).closest('.item_row').find('.lecture-link');
    ll.click();
    attemptToShow();
  })
  .insertAfter($('.lecture-link'));
})();