Resolving React-Hook-Form setValue() Not Updating Property Issue

Discover how to troubleshoot and fix the issue when `setValue()` from React-Hook-Form fails to update a property like `token` after form submission. --- This video is based on the question https://stackoverflow.com/q/77282980/ asked by the user 'PixelPaul' ( https://stackoverflow.com/u/4272599/ ) and on the answer https://stackoverflow.com/a/77284476/ provided by the user 'moshyfawn' ( https://stackoverflow.com/u/10414512/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: React-Hook-Form setValue() not updating property Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/licensing The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/by-sa/4.0/ ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/by-sa/4.0/ ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Troubleshooting the setValue() Issue in React-Hook-Form When working with forms in React, you may come across the setValue() method in React-Hook-Form, which allows you to programmatically set form values. However, you might encounter a frustrating situation where your property, such as token, is not updating as expected when you call setValue() inside the onSubmit function. Let’s explore why this happens and how to handle it effectively. Understanding the Problem You might be attempting to set a property in your form, specifically token, after collecting data from the user. In your code, when you submit the form, you call the setValue() function to update token, but you notice that the change does not seem to reflect immediately. This confusion arises because of how React handles state updates and the order of execution within the event handler. The Solution Why setValue() Doesn’t Show Changes Immediately Even though the setValue() method updates the value of the property, React does not re-render the updated component until the event handler completes its execution. This means that the token value will only be updated after the onSubmit function has finished running. Here’s how this can be addressed: Check Field's State Post-Submission: When you call setValue(), confirm that it is working by checking the value after the form is submitted. For example, utilize an alert to see the entire data object being submitted. Modifying Submission Logic: Instead of relying solely on the setValue() method, consider modifying your submission logic. One effective method is to pass the token value along with the data received from your form, ensuring that your form always contains the most current data at the point of submission. Suggested Implementation Here is an updated approach to handling the token passing more seamlessly: [[See Video to Reveal this Text or Code Snippet]] Benefits of This Approach Immediate Data Reflection: By constructing the finalData object, you ensure that all key properties, including token, are accounted for without having to rely on potentially delayed updates from setValue(). Simplified Logic: The approach simplifies the onSubmit logic as it directly assembles the data that needs to be processed. Conclusion When dealing with the setValue() function in React-Hook-Form, be mindful that state updates aren’t instantaneously available until the event handler has fully executed. By adapting your data handling strategy to include all relevant fields during the form submission, you can work around this limitation effectively. With these techniques, you should be able to ensure that the token and other fields are correctly populated and submitted as intended. Happy coding!