Infinite Scroll in React | Intersection Observer API Tutorial
🔥 Infinite Scroll in React | Intersection Observer API Tutorial
In this video, we implement a professional-grade *Infinite Scroll* in React using the modern **Intersection Observer API**. 👇
👉 While there are many ways to handle scrolling, using the Intersection Observer is the most performant method as it avoids the "scroll event" overhead that can slow down your browser. This is a common *Machine Coding Round* question in interviews for senior frontend roles.
💡 *Topics covered:*
✅ *Intersection Observer API:* Understanding how to detect when an element enters the viewport [[03:31]( • Infinite Scroll in React | Intersection Ob... )].
✅ *Ref Arrays:* Managing multiple DOM references for a dynamic list of items [[01:15]( • Infinite Scroll in React | Intersection Ob... )].
✅ *Loading States:* Handling asynchronous data fetching and showing a loading spinner [[02:44]( • Infinite Scroll in React | Intersection Ob... )].
✅ *Dynamic Data Injection:* Appending new items to your state as the user scrolls [[02:57]( • Infinite Scroll in React | Intersection Ob... )].
✅ *Memory Management:* Correctly using `unobserve` and `disconnect` in the `useEffect` cleanup function [[04:42]( • Infinite Scroll in React | Intersection Ob... )].
📌 *How the Logic Works:*
1. *Observer Setup:* We create an observer that watches a specific element (usually the second-to-last item in the list).
2. *Trigger:* When that item becomes visible (is "intersecting"), we trigger the `loadMore` function [[04:10]( • Infinite Scroll in React | Intersection Ob... )].
3. *Update:* New data is fetched and added to the list.
4. *Repeat:* We then "unobserve" the old target and start watching the new second-to-last item in the updated list [[05:18]( • Infinite Scroll in React | Intersection Ob... )].
This technique is used by major platforms like Facebook, Instagram, and Twitter to keep users engaged with a seamless content flow.
👍 If this tutorial helped you master Infinite Scrolling, don’t forget to *LIKE* 👍, *SHARE* 🔁, and *SUBSCRIBE* 🔔 for more React and JavaScript interview solutions!
#reactjs #javascript #frontendinterview #webdevelopment #infinitescroll #intersectionobserver #codinginterview #machinecoding #learnreact #performanceoptimization
http://googleusercontent.com/youtube_...
Sur cette page du site, vous pouvez voir la vidéo en ligne Infinite Scroll in React | Intersection Observer API Tutorial durée heure minute seconde en bonne qualité , qui a été Téléchargé par l'utilisateur Js For Interview 10 avril 2026, Partagez le lien avec vos amis et connaissances, sur youtube cette vidéo a déjà été regardée 8 fois et il a aimé 1 téléspectateurs. Bon visionnage!
