What is Intersection Observer? 🤔

It's a JavaScript API that allows you to asynchronously observe changes in the intersection of a target element with an ancestor element or the viewport.

Why do we need it in real life? 🌟

Intersection Observer helps us build more efficient and performant web applications by providing a way to track when elements become visible or invisible on the page without the need for continuous polling.

Syntax and Parameters: 📝

The Intersection Observer constructor takes in a callback function as well as an options object that specifies the thresholds and root element for observing.

Parameters:

⏭️ callback: A function to be called whenever the visibility of the target element changes.

⏭️ options: An object specifying configuration options such as root, rootMargin, and threshold.

Options object Properties:

⏭️root (optional): Specifies the element used as the viewport for checking visibility.

⏭️rootMargin (optional): Defines a margin around the root element's bounding box.

⏭️threshold (optional): Sets thresholds at which the callback will be invoked.

Real-life application: 🚀

➡️Lazy loading images.

➡️Detect if an element is in the viewport or not.

➡️Auto-play a video if in the viewport, otherwise pause the video.

➡️Infinite scrolling.

Live Demo 🎦

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