Template:Harvard BioDesign/JS

jQuery(document).ready(function($){ var timelineBlocks = $('.cd-timeline-block'), offset = 0.8;

//hide timeline blocks which are outside the viewport hideBlocks(timelineBlocks, offset);

//on scolling, show/animate timeline blocks when enter the viewport $(window).on('scroll', function(){ (!window.requestAnimationFrame) ? setTimeout(function(){ showBlocks(timelineBlocks, offset); }, 100) : window.requestAnimationFrame(function(){ showBlocks(timelineBlocks, offset); }); });

function hideBlocks(blocks, offset) { blocks.each(function(){ ( $(this).offset().top > $(window).scrollTop()+$(window).height()*offset ) && $(this).find('.cd-timeline-img, .cd-timeline-content').addClass('is-hidden'); }); }

function showBlocks(blocks, offset) { blocks.each(function(){ ( $(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'); }); } });