Lazy loading, infinite scrolling vue3 custom instructions

This article presents a custom lazy loading directive for Vue 3, implementing the IntersectionObserver API to optimize page load performance. The directive manages data acquisition and rendering in infinite scroll scenarios, ensuring continuous loadi

How to Implement a Custom Lazy Loading Directive in Vue 3 to Optimize Page Load Performance?

To implement a custom lazy loading directive in Vue 3, follow these steps:

1. Create a new directive by defining a JavaScript object with the following properties:

   • bind: Called when the directive is bound to an element.bind: Called when the directive is bound to an element.
   • inserted: Called when the element is inserted into the DOM.
2. In the inserted hook, add a listener for the IntersectionObserver
inserted: Called when the element is inserted into the DOM.
4. In the inserted hook, add a listener for the IntersectionObserver API. This API allows you to observe an element's intersection with its parent container.

When the observed element intersects with its parent, load the associated data or content asynchronously using the provided callback.

Update the DOM by rendering the loaded data or content.

How Does the Custom Directive Manage Data Acquisition and Rendering Process for Infinite Scroll Scenarios?

1. In an infinite scroll scenario, the custom directive manages data acquisition and rendering through the following process:
3. As the user scrolls down the page, the directive observes the intersection of the last element in the list with its parent container.
4. When the element intersects, it triggers a callback that fetches the next page of data from the server.

The fetched data is added to the existing list, and the list is re-rendered.

This process repeats as the user continues scrolling, ensuring continuous loading and rendering of data.

How Does the Directive Interact with Vue 3's Reactivity System to Keep Data and View Synchronized?

1. The directive interacts with Vue 3's reactivity system through the following mechanism:
3. When the data fetched from the server is updated, it triggers a reactive update in Vue 3.

The directive observes the updated data and updates the DOM accordingly.🎜🎜This ensures that the view (i.e., the displayed list) remains in sync with the updated data.🎜🎜

The above is the detailed content of Lazy loading, infinite scrolling vue3 custom instructions. For more information, please follow other related articles on the PHP Chinese website!