https://mhcat.cat/bundles/microblaumhcatbase/js/main.js

1jQuery(document).ready(function($){
2	var timelineBlocks = $('.cd-timeline-block'),
3		offset = 0.8;
4
5	//hide timeline blocks which are outside the viewport
6	hideBlocks(timelineBlocks, offset);
7
8	//on scolling, show/animate timeline blocks when enter the viewport
9	$(window).on('scroll', function(){
10		(!window.requestAnimationFrame)
11			? setTimeout(function(){ showBlocks(timelineBlocks, offset); }, 100)
12			: window.requestAnimationFrame(function(){ showBlocks(timelineBlocks, offset); });
13	});
14
15	function hideBlocks(blocks, offset) {
16		blocks.each(function(){
17			( $(this).offset().top > $(window).scrollTop()+$(window).height()*offset ) && $(this).find('.cd-timeline-img, .cd-timeline-content').addClass('is-hidden');
18		});
19	}
20
21	function showBlocks(blocks, offset) {
22		blocks.each(function(){
23			( $(this).offset().top <= $(window).scrollTop()+$(window).height()*offset && $(this).find('.cd-timeline-img').hasClass('is-hidden') ) && $(this).find('.cd-timeline-img, .cd-timeline-content').removeClass('is-hidden').addClass('bounce-in');
24		});
25	}
26});