Скачать или смотреть Building Infinite Scroll with react-query

Learn how to implement an `infinite scroll` feature in your React applications using `react-query` to manage data fetching and pagination efficiently.
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Building Infinite Scroll with react-query: A Simple Guide

Infinite scrolling is a popular feature in modern web applications, allowing users to continuously load more content without the need for pagination. If you're using React and want to implement this feature, you can leverage the power of react-query. In this guide, we'll explore how to make infinite scroll work seamlessly in your React app using react-query.

Understanding the Problem

When you're implementing an infinite scroll, the core requirement is to manage data pagination effectively. The challenge often comes from needing to track:

Current Page: Understanding which page of data you're on.

More Data: Determining if there are more items to fetch.

For example, if you're working with a simple API, such as the CocktailDB or PokeAPI, it may not provide pagination metadata, and you will need to handle this manually.

The Solution: Using useInfiniteQuery

To implement infinite scrolling with react-query, you'll need to utilize the useInfiniteQuery hook. This hook allows you to fetch data in pages and control loading more data when the user reaches the end of the current list.

Step-by-Step Implementation

Define the Fetch Function:
You'll need to create a function that fetches data from your API. This function will accept parameters for pagination.

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Using useInfiniteQuery:
Call useInfiniteQuery with a unique key, your fetch function, and a getFetchMore function to handle pagination.

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Managing Pagination Logic

The key to making sure you're fetching new data correctly lies in the getFetchMore function. You need to return information about whether there are more pages and what the current page should be:

Determining More Pages: Check the length of the last batch of data you've fetched. If it's less than a specified number, you may have reached the end of your list.

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Returning the Next Page Number: If more pages exist, return the next page number based on how many groups you have already fetched.

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Final Example

Here's how the complete getFetchMore logic could look:

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With this setup, you can now call fetchMore when you want to load more content.

Bringing It All Together

In summary, implementing infinite scroll in your React application using react-query involves:

Creating a fetch function that considers pagination.

Utilizing the useInfiniteQuery hook to handle data fetching.

Implementing logic in getFetchMore to decide when to stop fetching additional pages based on the length of the last fetched response.

By following these steps, you’ll be able to provide a smooth infinite scrolling experience for your users, creating a more engaging interface.

Conclusion

Infinite scroll can significantly enhance the user experience of your application when implemented correctly. With react-query, managing your queries becomes straightforward. Now that you know how to create this functionality, why not try it out in your next React project?