3 ways to implement infinite scroll in React

Editor’s note: This article was last updated on 14 April 2023 to include information about the Intersection Observer API. 

In today’s fast-paced digital landscape, providing a seamless and engaging user experience is more important than ever before. One popular method for improving user experience is implementing infinite scrolling, a web design technique that loads content continuously as the user scrolls down the page.

This intuitive feature eliminates the need for traditional pagination and has become a staple in modern web applications. In this article, we’ll explore three unique approaches to implementing infinite scrolling in React applications:

1. Building the entire implementation from scratch: Covers the fundamentals of creating an infinite scroll solution from the ground up, giving you full control over customization and functionality
2. Using an existing infinite scroll library or component: Leverages pre-built libraries or components, which save time and effort but still offer customization options
3. Leveraging the Intersection Observer API: Harnesses the power of the Intersection Observer API, which allows for efficient and performant detection when elements come into view, thereby triggering content loading

To follow along with this article, you’ll need a basic understanding of React. Let’s get started!

Jump ahead:

• Basic React application setup
  • Setting up the initial state
  • Loading data
  • Calling fetchData on component mount
• Methods for implementing infinite scroll in React
  • 1. Building the entire implementation from scratch
  • 2. Utilizing an existing infinite scroll library or component
  • 3. Leveraging the Intersection Observer API

Basic React application setup

Throughout this article, we’ll build on a consistent foundation to implement the various infinite scrolling techniques. For each method, we’ll adapt the following steps and code snippets.

Setting up the initial state

First, we’ll set up the initial state for our component. This includes the list of items to display, the necessary loading and error indicators, and a variable to keep track of the current page number:

import React, { useState, useEffect, useRef } from 'react';

const InfiniteScrollExample = () => {
  const [items, setItems] = useState([]);
  const [isLoading, setIsLoading] = useState(false);
  const [error, setError] = useState(null);
  const [page, setPage] = useState(1);

  // ... rest of the component
};

Loading data

Next, we’ll create a function to fetch data from an API or another data source, increment the page number, and update the state with the fetched items. Additionally, we’ll handle any errors during the data fetching process:

const fetchData = async () => {
  setIsLoading(true);
  setError(null);

  try {
    const response = await fetch(`https://api.example.com/items?page=${page}`);
    const data = await response.json();

    setItems(prevItems => [...prevItems, ...data]);
    setPage(prevPage => prevPage + 1);
  } catch (error) {
    setError(error);
  } finally {
    setIsLoading(false);
  }
};

Calling fetchData on component mount

Lastly, we’ll use the useEffect Hook to call the fetchData function when the component mounts initially:

useEffect(() => {
  fetchData();
}, []);

These foundational steps will be present in all of the techniques we discuss in this article. As we explore each method for implementing infinite scrolling React, we’ll modify and expand upon this base.

Methods for implementing infinite scroll in React

1. Building the entire implementation from scratch

Building the entire infinite scroll implementation from scratch involves handling the scroll event, loading more data, and updating the state in your React application. This approach provides you with full control over customization and functionality.

Extending our basic setup, we’ll first create a function to handle the scroll event. This function will check if the user has reached the bottom of the page and call fetchData if necessary. We’ll add a scroll event listener to the window object and remove it when the component is unmounted:

const handleScroll = () => {
  if (window.innerHeight + document.documentElement.scrollTop !== document.documentElement.offsetHeight || isLoading) {
    return;
  }
  fetchData();
};

useEffect(() => {
  window.addEventListener('scroll', handleScroll);
  return () => window.removeEventListener('scroll', handleScroll);
}, [isLoading]);

Finally, we render the items, the loading indicator, and any error messages within the component:

return (
  <div>
    <ul>
      {items.map(item => (
        <li key={item.id}>{item.name}</li>
      ))}
    </ul>
    {isLoading && <p>Loading...</p>}
    {error && <p>Error: {error.message}</p>}
  </div>
);

With that, we have a fully functional infinite scroll implementation built from scratch. This approach allows for extensive customization and more control over functionality. However, it may be more time-consuming and require more maintenance than using an existing library or component.

2. Utilizing an existing infinite scroll library or component

Using an existing infinite scroll library or component can save you time and effort as you leverage pre-built, pre-tested solutions while retaining customization options. One popular library for implementing infinite scrolling in React is react-infinite-scroll-component. Let’s learn how to use this library to create infinite scrolling in our React application.

First, install the react-infinite-scroll-component library using npm or Yarn:

npm install react-infinite-scroll-component
or
yarn add react-infinite-scroll-component

Then, we’ll extend our basic setup, import the InfiniteScroll component from the library, and wrap the list of items in it. Configure the component by passing the necessary props like dataLength, next, hasMore, and loader:

import InfiniteScroll from 'react-infinite-scroll-component';

// ...

return (
  <div>
    <InfiniteScroll
      dataLength={items.length}
      next={fetchData}
      hasMore={true} // Replace with a condition based on your data source
      loader={<p>Loading...</p>}
      endMessage={<p>No more data to load.</p>}
    >
      <ul>
        {items.map(item => (
          <li key={item.id}>{item.name}</li>
        ))}
      </ul>
    </InfiniteScroll>
    {error && <p>Error: {error.message}</p>}
  </div>
);

With that, we’ve implemented infinite scrolling in our React application using the react-infinite-scroll-component library. We didn’t use scroll handling because react-infinite-scroll-component handles that for us.

The react-infinite-scroll-component library offers a faster and more streamlined implementation process but still provides customization options, like for scroll height and scroll overflow. However, you should keep in mind the trade-off of introducing additional dependencies in your project.

3. Leveraging the Intersection Observer API

The Intersection Observer API is a modern development technique that can detect when elements come into view, thereby triggering content loading for infinite scrolling. The Intersection Observer API observes changes in the intersection of target elements with an ancestor element or the viewport, making it well-suited for implementing infinite scrolling.

Extending our basic setup, create a ref for the observer target element and set up the Intersection Observer in a useEffect Hook. When the target element comes into view, call the fetchData function as follows:

const observerTarget = useRef(null);

useEffect(() => {
  const observer = new IntersectionObserver(
    entries => {
      if (entries[0].isIntersecting) {
        fetchData();
      }
    },
    { threshold: 1 }
  );

  if (observerTarget.current) {
    observer.observe(observerTarget.current);
  }

  return () => {
    if (observerTarget.current) {
      observer.unobserve(observerTarget.current);
    }
  };
}, [observerTarget]);

Then, render the items, loading indicator, error messages, and the observer target element within the component:

return (
  <div>
    <ul>
      {items.map(item => (
        <li key={item.id}>{item.name}</li>
      ))}
    </ul>
    {isLoading && <p>Loading...</p>}
    {error && <p>Error: {error.message}</p>}
    <div ref={observerTarget}></div>
  </div>
);

By leveraging the Intersection Observer API, we have created an efficient and performant infinite scrolling solution in our React application. This approach offers a modern, browser-native method for detecting when elements come into view, but it may not be supported in all browsers or environments without using a polyfill.

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Conclusion

Infinite scrolling is a powerful web design technique. It enhances the user experience by progressively loading content as users scroll down a page, thereby eliminating the need for pagination.

In this article, we explored three different approaches for implementing infinite scrolling in React applications. Each technique has its own advantages and potential drawbacks, so it’s essential to choose the method that best suits your specific requirements and your users’ needs.

By implementing infinite scrolling in your React applications, you can provide an intuitive and engaging user experience that keeps visitors engaged with your content. I hope you enjoyed this article! Be sure to leave a comment if you have any questions.