How To Load Images Dynamically Or Lazily When Users Scrolls Them Into View

When it comes to optimizing website performance and providing a smooth user experience, loading images dynamically or lazily can be a game-changer. In this article, we'll dive into how you can implement this feature on your website to ensure that images are loaded efficiently as users scroll through your content.

### Understanding Dynamic and Lazy Loading

Dynamic loading involves fetching and rendering images only when they are needed. This can significantly reduce the initial loading time of a webpage and improve overall performance. On the other hand, lazy loading is a technique that defers the loading of non-essential resources, such as images, until they are required.

### Implementing Dynamic Image Loading

To implement dynamic image loading, you can utilize JavaScript to detect when an image enters the viewport and then load it at that moment. One common approach is to calculate the position of the image in relation to the viewport and trigger the loading process accordingly.

Javascript

document.addEventListener("DOMContentLoaded", function() {
  let images = document.querySelectorAll("img[data-src]");
  
  const handleImage = (image) =&gt; {
    image.src = image.getAttribute("data-src");
    image.onload = () =&gt; {
      image.removeAttribute("data-src");
    };
  };

  const options = {
    threshold: 0.5
  };

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

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

### Lazy Loading Image Implementations

Lazy loading can help improve website load times by only loading images when they are visible to the user. There are various libraries and frameworks that provide out-of-the-box solutions for lazy loading, such as `Lozad.js` and `LazyLoad`.

Javascript

const lazyLoadInstance = new LazyLoad({
  elements_selector: ".lazy"
});

By adding the `lazy` class to your image elements, these libraries will take care of the rest, ensuring that images are loaded only when they are about to become visible to the user.

### Practical Considerations

When implementing dynamic or lazy loading for images, it's important to consider accessibility and SEO implications. Make sure to provide alternative text for each image and consider the impact of lazy loading on search engine indexing.

In conclusion, incorporating dynamic or lazy loading techniques for images can significantly enhance the performance of your website while improving the user experience. By following the steps outlined in this article, you can optimize image loading on your site and impress your visitors with faster load times.

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