3 Javascript Lazy Loading Examples
Explore advanced lazy loading techniques for images, videos, and entire modules to radically accelerate First Contentful Paint (FCP). We demonstrate utilizing native loading="lazy" attributes and the power of the Intersection Observer API to achieve optimal performance. Forget slow jQuery plugins; this collection focuses only on current, highly efficient JS solutions.
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JavaScript Lazy Loading with IntersectionObserver
A performant lazy loading solution utilizing the IntersectionObserver API to defer off-screen image loading. The script monitors elements with a lazy-load class, swapping the data-src attribute into src upon viewport entry - buffered by a 200px rootMargin - to optimize bandwidth and initial page load speed while preventing layout shifts via CSS placeholders.
Infinite Scrolling with Image Cards
This infinitely scrolling image grid employs an IntersectionObserver with baton-passing observation to dynamically load content from the Pixabay API, creating cards through DOM manipulation as the user scrolls. JavaScript manages the paginated requests while CSS Grid provides responsive layout adaptation, with custom properties enabling seamless dark/light theme switching and clip-path animations.
Pixelated Lazy Load for Images
Pure JavaScript and CSS demonstrate how to replace a heavily pixelated placeholder with a full-size image using the data-src attribute and switching the image-rendering styles.
