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Lazy loading pagination is a modern web development technique, popular for its efficiency and relevance in handling large data sets. This approach enables your React application to efficiently load and display large quantities of data by only retrieving and rendering a specific portion visible to the user — often referred to as a page. It significantly minimizes the load time of your app, providing a better user experience.
This technique is highly beneficial in the current digital era, where users require real-time responses and superior user experiences. The main advantages include increased app performance, reduced server load, and efficient memory usage. ReactJS has numerous libraries that support lazy loading and pagination, making the development process smoother.
//dependencies
import React, { useState, useEffect } from 'react';
import axios from 'axios';
function App() {
const [data, setData] = useState([]);
const [page, setPage] = useState(1);
useEffect(() => {
const fetch_data = async () => {
const res= await axios.get('https://api.demo.com/data?page=${page}');
setData(oldData => [...oldData, ...res.data]);
};
fetch_data();
}, [page]);
// then, you can add scroll listener - when the user reaches the end of the page, increment the page by 1.
return (
<div className="App" onScroll={(e) => handleScroll(e)}>
{your code here}
</div>
);
}
export default App;
Understanding the Code
The code demonstrates a simple implementation of lazy loading pagination in React. The useEffect hook ensures that when the component mounts, an HTTP request is made to the server to retrieve data. It takes ‘page’ as a dependency. The page state determines the chunk of data to be retrieved from the server, effectively creating a pagination system.
The setData function merges previous data with the newly fetched data. This ensures that previous data still exists while new data gets added, maintaining a fluid scrolling experience.
Pagination combined with lazy loading only fetches new data when necessary, greatly enhancing performance. This specifically comes to play when dealing with large amounts of data.
Popular Libraries for Lazy Loading Pagination
There are several libraries available that can ease the implementation of lazy loading and pagination in your React applications:
- React Infinite Scroll Component: This is a popular npm package for implementing infinite scroll in React.
- React Virtualized: This is a set of React components for efficiently rendering large lists, tabular data and more. It includes a component for efficiently handling infinite loading.
- React Window: Another library for rendering large lists or tabular data much more efficiently. It’s smaller and faster compared to React Virtualized, with an almost similar API.
Incorporating lazy loading pagination improves both the scalability of your application and the user experience. As user interface trends continue to evolve, it’s essential to stay up-to-date with modern techniques like lazy loading and pagination. Always remember, the ultimate goal is to provide users with fast, efficient, and enjoyable experiences.
