SirMustache

$(window).on('scroll', function() {
  var fromTop = $(document).scrollTop(),
      $items = $('.item'),
      allItems = [],
      $currentItem;

  allItems = $items.filter(function() {
    return $(this).offset().top < fromTop;
  });
  $currentItem = allItems.eq(allItems.length - 1);

  $items.removeClass('active');
  $currentItem.addClass('active');
});

Note: In jQuery 1.3 [@attr] style selectors were removed (they were previously deprecated in jQuery 1.2). Simply remove the "@" symbol from your selectors in order to make them work again.

<video ng-attr-autoplay="{{vm.autoplay ? 'true' : 'false' }}"></video>