How to use the React-Query library for pagination with cursor-based navigation

React-Query is a powerful library for managing server-state and caching in React applications. Implementing pagination with cursor-based navigation using React-Query is straightforward. Here's a step-by-step guide:

1. Install React-Query:

   First, ensure you have React-Query installed in your project:

   bashCopy code
   npm install react-query
   

2. Create a Query Function:

   Create a function that fetches data from your server using cursor-based pagination. This function will be used by React-Query to fetch data.

   javascriptCopy code
   const fetchPaginatedData = async (cursor) => {
     const response = await fetch(`/api/data?cursor=${cursor}`);
     if (!response.ok) {
       throw new Error('Failed to fetch data');
     }
     return response.json();
   };
   

3. Use React-Query Hooks for Pagination:

   Use React-Query hooks (useQuery) to manage the pagination state and fetch data.

   javascriptCopy code
   import { useQuery } from 'react-query';
   
   const MyComponent = () => {
     const { data, fetchNextPage, hasNextPage, isFetchingNextPage } = useQuery(
       ['data', nextPageCursor],
       () => fetchPaginatedData(nextPageCursor),
       {
         getNextPageParam: (lastPage, allPages) =>
           lastPage.hasNextPage ? lastPage.nextCursor : undefined,
       }
     );
   
     if (!data) {
       return <div>Loading...</div>;
     }
   
     return (
       <div>
         {data.pages.map((page) =>
           page.data.map((item) => (
             <div key={item.id}>{/* Render your item here */}</div>
           ))
         )}
         {hasNextPage && (
           <button onClick={() => fetchNextPage()} disabled={isFetchingNextPage}>
             {isFetchingNextPage ? 'Loading more...' : 'Load more'}
           </button>
         )}
       </div>
     );
   };
   
   export default MyComponent;
   

   • data: The paginated data returned by the server.
   • fetchNextPage: Function to fetch the next page of data.
   • hasNextPage: Indicates whether there is more data available.
   • isFetchingNextPage: Indicates whether the next page is currently being fetched.
   • getNextPageParam: A function that determines the cursor for the next page based on the last page's data.

4. Handle Server-Side Cursor Logic:

   Ensure your server-side logic supports cursor-based pagination. Your server should accept a cursor parameter and return the appropriate data based on that cursor.

   Here's a simplified example of server-side logic in Node.js with Express:

   javascriptCopy code
   app.get('/api/data', (req, res) => {
     const cursor = req.query.cursor;
     // Use cursor to fetch the data from your database
     // Return the data and nextCursor if there's more data available
     // Example response:
     res.json({
       data: [/* Array of data */],
       hasNextPage: true,
       nextCursor: 'nextCursorValue',
     });
   });
   

That's it! You've now implemented pagination with cursor-based navigation using React-Query. Adjust the server-side logic according to your specific backend implementation.