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 of page load. You can implement it using the loading attribute in your <img> tags or by using JavaScript libraries like Intersection Observer.

Can you show me an example of using the Intersection Observer?

Sure! Here's a simple example:

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

const loadImage = (image) => {
  image.src = image.dataset.src;
};

const observer = new IntersectionObserver((entries, observer) => {
  entries.forEach(entry => {
    if (entry.isIntersecting) {
      loadImage(entry.target);
      observer.unobserve(entry.target);
    }
  });
}, options);

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

This code will load images only when they are about to enter the viewport.

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. It enhances user experience by loading content as needed.

Are there any drawbacks to lazy loading?

Yes, potential drawbacks include SEO concerns if not implemented correctly, and it may lead to a poor user experience if users scroll too quickly and content doesn't load in time.