Created
January 23, 2019 07:46
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| ((document, window) => { | |
| document.addEventListener('DOMContentLoaded', () => { | |
| let images = Array.from(document.querySelectorAll('img[data-src]')); | |
| if (!('IntersectionObserver' in window)) { | |
| images.forEach(image => { | |
| image.src = image.dataset.src; | |
| }); | |
| } else { | |
| let observer = new IntersectionObserver((entries, observer) => { | |
| entries.forEach(entry => { | |
| if (entry.intersectionRatio > 0) { | |
| let image = entry.target; | |
| observer.unobserve(image); | |
| image.src = image.dataset.src; | |
| } | |
| }); | |
| }, {rootMargin: '50px 0px', threshold: 0.01}); | |
| images.forEach(image => observer.observe(image)); | |
| } | |
| }); | |
| })(document, window); |
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