Throttle scroll based interaction trigger

scrollBasedInteraction.js

function throttle(callback, limit) {
	var wait = false;
	return function () {
		if (!wait) {
			callback.call();
			wait = true;
			setTimeout(function () {
				wait = false;
			}, limit);
		}
	};
},

function statisticsAnimation() {
	if ( !$('.statistics').hasClass('is-animated')) {
		var scrollPos = $(document).scrollTop(),
			windowHeight = $(window).height(),
			windowBottomPos = scrollPos + windowHeight - 100,
			statsOffset = $('.statistics').offset(),
			statsPos = statsOffset.top;

		if (windowBottomPos > statsPos) {
			console.log('it happened at: ' + windowBottomPos);
			$('.statistics').addClass('is-animated');
		}
	}
},

$(window).load(function() {
	statisticsAnimation();
	window.addEventListener("scroll", throttle(statisticsAnimation, 200 ));
})