How can I implement lazy loading in my web application?

How can I implement lazy loading in my web application?

Lazy loading is a design pattern that postpones loading non-essential resources at the point the page is initially loaded. You can implement it using JavaScript or libraries like Intersection Observer.

Can you show me a simple code example?

Sure! Here's a basic example using the Intersection Observer API:

const images = document.querySelectorAll('img[data-src]');
const config = { rootMargin: '0px', threshold: 0.1 };

let observer = new IntersectionObserver((entries, observer) => {
    entries.forEach(entry => {
        if (entry.isIntersecting) {
            const img = entry.target;
            img.src = img.dataset.src;
            observer.unobserve(img);
        }
    });
}, config);

images.forEach(image => {
    observer.observe(image);
});

What are the benefits of using lazy loading?

The benefits include improved page load times, reduced initial data usage, and better performance on mobile devices.

Are there any drawbacks to consider?

Yes, potential drawbacks include SEO implications if not implemented correctly and the need for additional JavaScript, which can affect performance.