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Learn how to implement a `skeleton loader` in Vue.js and improve user experience while images load asynchronously.
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How to Show a Skeleton Loader in Vue.js While Images Are Loading

In web development, ensuring a smooth and engaging experience for your users is vital. One common frustration users face is when images take too long to load, leading to a blank screen or incomplete content. Thankfully, many developers opt for a strategy known as skeleton loading, which gives users a placeholder while the actual content is being fetched. In this guide, we will address a common scenario in Vue.js involving a skeleton loader that appears while images are loading.

The Problem

When working with asynchronous image loading in Vue.js, particularly with a component that displays multiple items, a common issue arises: ensuring that each image shows the corresponding content or a skeleton loader while it is still being fetched. If the loading condition isn't managed properly, users might see all loaders appear at once, or worse, they might never see the content they’re waiting for.

The Core Issue

In Vue.js, you may find that setting an isLoaded variable true when the image loads can cause conflicts. The existing implementation leads to a situation where isLoaded is false until the image is already loaded, causing an infinite loader state.

The Solution

To resolve this issue, we need to adjust our approach to loading images. Instead of relying solely on event listeners like @ load, we can preload images using the onMounted hook. This guarantees that we can set the isLoaded state only when the images are fully loaded, rather than trying to rely on their state within the template rendering.

Step-by-Step Implementation

Remove the Event Listener from the <img> tag: This prevents the isLoaded variable from getting stuck in an unreachable state.

Preload the Image: Using the onMounted lifecycle hook, create a new Image instance and set its source. When the image loads successfully, update the isLoaded state.

Here’s how your ItemCard component could look after these adjustments:

Updated ItemCard.vue Component

[[See Video to Reveal this Text or Code Snippet]]

Explanation of Changes

Conditionally Render Skeleton Loader: Using v-if, we display the ItemCardSkeleton component when either the data is pending or the image isn't loaded.

Preloading with onMounted: By creating a new Image and attaching an onload event to it, we ensure that isLoaded is only set to true once the image has completed loading.

Conclusion

By following the adjustments outlined above, you can implement a fully functional skeleton loader in Vue.js. This not only enhances the user experience by managing loading states effectively but also improves the overall responsiveness of your application.

Now, when your images load at different speeds, users will see placeholders gradually replaced with the actual content, creating a smoother and more visually appealing transition.

Incorporating these loading strategies into your Vue.js applications will help with performance and user engagement, making your applications feel faster and more reliable.



With these guidelines, you can tackle similar challenges and ensure a better experience for your users while enhancing your skills in Vue.js.