How to Pagination Unpaginated Data with SWR in ReactJS

Discover how to effectively paginate unpaginated data fetched with SWR in ReactJS. Learn easy steps to manage and display your data seamlessly!
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How to Pagination Unpaginated Data with SWR in ReactJS

Handling data in a web application is one of the core functionalities that developers often need to master. When working with APIs, you might encounter situations where the data comes in a single chunk, without pagination. In such cases, you might wonder how to implement pagination for better organization and user experience. If you are using Vercel's SWR library, this guide is for you. We will explore how to effectively paginate unpaginated data fetched using SWR in your React applications.

Understanding the Problem

Imagine you have an API that returns a large dataset but does not support pagination; all the data comes in one go. This can lead to performance issues when trying to load or display all that information at once. The SWR library provides utilities for fetching data, but traditional pagination functions like useSWRInfinite depend on APIs that offer pagination through query parameters such as ?page={pageNumber}.

So, how do we tackle pagination when the data is returned unpaginated? Let's break it down step by step.

The Solution: Client-side Pagination Logic

1. Hold Your Data

First and foremost, ensure that you have all your data stored in a variable after fetching it from the API. SWR allows you to store the fetched data easily. Here’s a basic structure to hold your data:

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

In the above example, data will contain all of your unpaginated data after the fetch is complete.

2. Create Pagination State Variables

To implement pagination, you will need to establish state variables to handle your current page and the items displayed per page. Here’s how you can do it using React's useState:

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

3. Calculate the Data to Display

Next, based on your current page and items per page, you will slice the data array to display only the relevant items for that page:

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

4. Render the Current Page Items

Now that you have your currentItems, you can map over them and render the data in your component:

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

5. Implement Pagination Controls

Finally, add pagination controls so users can navigate through different pages. Here's a simple way to implement this:

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

Conclusion

Paginating unpaginated data fetched using SWR may seem daunting at first, but it can be easily managed with a few straightforward steps. By holding your data in state, calculating the page items, and rendering them with controls, users can enjoy a seamless navigation experience through potentially large datasets.

By implementing these techniques, you’re not only improving the usability of your application but also optimizing its performance. Happy coding, and enjoy building with React and SWR!