jQuery multiple animate() callback

Question

I'm trying to animate a set of elements simultaneously (almost, there's a small delay between each animation):

$('.block').each(function(i){
   $(this).stop().delay(60 * i).animate({
     'opacity': 1
   }, {
      duration: 250,
      complete: mycallbackfunction // <- this fires the callback on each animation :(
   });
});

How can I run a callback function after all animations have completed?

Answer 1

Use a closure around a counter variable.

var $blocks = $('.block');
var count = $blocks.length;
$blocks.each(function(i){
   $(this).stop().delay(60 * i).animate({
     'opacity': 1
   }, {
      duration: 250,
      complete: function() {
        if (--count == 0) {
          // All animations are done here!
          mycallbackfunction();
        }
      }
   });
});

Note the saving of the list of items into the $block variable to save a lookup.