Detect if a scroll event is triggered manually in jQuery

Question

This question was already asked here a long time ago:

Detect jquery event trigger by user or call by code

But it has never been answered conclusively (or m

Answer 1

After attempting to implement the various solutions in this issue I came up with a different approach that is working well for me.

I use a manual boolean for whether an animation is running:

var isRunningAnimation = false;

and set it to true just before animating, and false in the jQuery animate callback function:

  isRunningAnimation = true;

  $('html').animate({
    scrollLeft: 100,
    scrollTop:  100
  }, 400, 'swing', function() {
    isRunningAnimation = false;
  });

and then in the scroll listener just check that boolean:

$('scroll', function() {
  if (!isRunningAnimation) {
    // If we made it to here, the animation isn't running
  }
});

Of course technically if the user decides to manually scroll during the animation, that won't trigger the on scroll logic either, but that seems like enough of an edge case to not worry about.