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intersection-observer

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intersection-observer

A polyfill for IntersectionObserver

  • 0.12.2
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What is intersection-observer?

The intersection-observer npm package is a polyfill for the Intersection Observer API, which provides a way to asynchronously observe changes in the intersection of a target element with an ancestor element or with a top-level document's viewport. This is particularly useful for tasks like lazy loading of images or implementing 'infinite scroll' features without relying on scroll events, thereby improving performance and resource usage.

What are intersection-observer's main functionalities?

Observing visibility of an element

This code sample demonstrates how to create an IntersectionObserver to monitor when a specific element, referred to as '.target-element', becomes visible within the viewport. When the element's visibility changes to visible, a message is logged to the console.

const observer = new IntersectionObserver(entries => {
  entries.forEach(entry => {
    if (entry.isIntersecting) {
      console.log('Element is visible!');
    }
  });
});

observer.observe(document.querySelector('.target-element'));

Lazy loading images

This example shows how to use IntersectionObserver for lazy loading images. Images with the class 'lazy-load' only load their source URL when they're about to enter the viewport, improving page load times. The observer stops watching an image once it has loaded.

const observer = new IntersectionObserver((entries, observer) => {
  entries.forEach(entry => {
    if (entry.isIntersecting) {
      entry.target.src = entry.target.dataset.src;
      observer.unobserve(entry.target);
    }
  });
}, {rootMargin: '0px', threshold: 0.1});

document.querySelectorAll('img.lazy-load').forEach(img => {
  observer.observe(img);
});

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Package last updated on 14 Jun 2022

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