What are some effective lazy loading tools and libraries?

What are some effective lazy loading tools and libraries?

There are several great tools and libraries for lazy loading, such as Lozad.js, LazyLoad.js, and Intersection Observer API. Do you have a specific use case in mind?

I'm building a website and want to improve its performance. Which one would you recommend?

For a website, I recommend using the Intersection Observer API as it’s built into modern browsers and offers great performance. Lozad.js is also a good choice for easy implementation.

How do I implement the Intersection Observer API?

To implement it, you create an instance of IntersectionObserver, define a callback function to handle visibility changes, and then observe the elements you want to lazy load.

Can you provide a code example?

Sure! Here's a simple example:

const observer = new IntersectionObserver((entries) => {
    entries.forEach(entry => {
        if (entry.isIntersecting) {
            const img = entry.target;
            img.src = img.dataset.src; // Load the image
            observer.unobserve(img); // Stop observing
        }
    });
});

const images = document.querySelectorAll('img[data-src]');
images.forEach(img => observer.observe(img));