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Lazy loading Intersection Observer with Vanilla JS
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document.addEventListener("DOMContentLoaded", () => { | |
const lazyImages = [...qall(".lazy-load")] | |
if (!lazyImages) return; | |
if ("IntersectionObserver" in window) { | |
let lazyImageObserver = | |
new IntersectionObserver((entries, observer) => { | |
entries.forEach(entry => { | |
if (entry.isIntersecting) { | |
let lazyImage = entry.target; | |
lazyImage.src = lazyImage.dataset.src; | |
lazyImage.srcset = lazyImage.dataset.srcset; | |
lazyImage.classList.remove("lazy-load"); | |
lazyImageObserver.unobserve(lazyImage); | |
} | |
}); | |
}); | |
lazyImages.forEach(lazyImage => { | |
lazyImageObserver.observe(lazyImage); | |
}); | |
} | |
}); |
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