How to Use useQuery in an onClick Handler with React Query

Описание: Learn how to leverage React Query's `useQuery` and `useMutation` for handling document downloads efficiently in your React app.
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This video is based on the question https://stackoverflow.com/q/66891024/ asked by the user 'btrautmann' ( https://stackoverflow.com/u/10858461/ ) and on the answer https://stackoverflow.com/a/66891350/ provided by the user 'TkDodo' ( https://stackoverflow.com/u/8405310/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Handling Document Downloads in React with React Query

In modern web applications, downloading documents or data efficiently is a common requirement. If you are using React and React Query, you might find yourself in a situation where you need to trigger a download of a document based on user interaction, such as clicking a button. In this guide, we'll explore a specific problem and provide clear solutions to enhance the user experience when downloading documents in a React application.

The Challenge: Calling useQuery in an onClick Handler

Recently, a developer faced a challenge where an array of documents was fetched, and a click on the download button needed to trigger a getDocumentById action to fetch and download the specific document. However, they were unable to call the query hook in the handler directly. Let's break down the situation and find a solution.

A Brief Overview of the Code

Here's a simplified version of the existing code structure:

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

The issue arises from trying to integrate the querying mechanism within the event handler where the document ID is only accessible.

Proposed Solutions

There are two effective approaches to address this problem, and I'll explain both in detail:

Solution 1: Disable Query and Use refetch

The first option is to disable the query initially and then trigger it imperatively using the refetch method when the button is clicked. Here’s how you can implement this:

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

How This Works

Disabling the Query: By setting enabled: false, you prevent the query from running automatically.

Imperative Trigger: The refetch function can now be called directly in your onClick handler to fetch the specific document when the button is clicked.

Solution 2: Use a Mutation Instead of a Query

The second approach is to use a mutation instead of a query, which is often a better choice for download actions since it represents a state change on the server. Here's how to set it up:

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

Why This Approach is Preferable

Semantics: A download is a modification of state on the server, which aligns well with React Query's mutation feature.

Simplicity: With mutations, you do not need to worry about automatic runs or managing the query state. You have full control over when to execute the download.

Conclusion

Incorporating user-triggered downloads in a React application using React Query can be navigated efficiently through either disabling queries in favor of refetch or employing a mutation for document downloads. Each method has its own merits and can be chosen based on the specific requirements of your application.

Implementing these approaches will not only enhance the functionality of your application but also provide a smoother user experience when dealing with document downloads. Experiment with these solutions and see which one fits your use case the best.

Feel free to share your thoughts or any other approaches you have used in the comments below!