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Minimal VanillaJS LazyLoad Images using Intersection Observer
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Title of the document</title> | |
| </head> | |
| <body> | |
| <img loading="lazy" data-lazy | |
| src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkqAcAAIUAgUW0RjgAAAAASUVORK5CYII=" | |
| data-src="/path/to/image.jpg" | |
| width="1285" height="358" | |
| alt=""> | |
| </body> | |
| </html> |
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| // Lazy Load Images using Intersection Observer | |
| var observer = new IntersectionObserver(onIntersect); | |
| document.querySelectorAll("[data-lazy]").forEach((img) => { | |
| observer.observe(img); | |
| }); | |
| function onIntersect(entries) { | |
| entries.forEach((entry) => { | |
| if (entry.target.getAttribute("data-processed") || !entry.isIntersecting) | |
| return true; | |
| entry.target.setAttribute("src", entry.target.getAttribute("data-src")); | |
| entry.target.setAttribute("data-processed", true); | |
| }); | |
| } |
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