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Struggling with `React Hook Form` not updating values for array default values? This blog provides clear solutions and examples to streamline form handling with React and React Hook Form.
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Troubleshooting React Hook Form with Array Default Values: A Comprehensive Guide

Creating dynamic forms in React can be a daunting task, especially when you run into issues with state management. One common issue developers face is when React Hook Form does not update values properly when default values are set as an array. In this post, we'll delve into the problem, explore why it occurs, and provide a clear solution to ensure your forms work seamlessly.

The Problem

What Is Happening?

When using React Hook Form with default values defined as an array, the components, particularly those wrapped in controllers like react-select, may not behave as expected. Specifically, the form state does not update, causing confusion and frustration.

Example Scenario

Let's consider a situation where you are generating a form dynamically from an array of questions. When these questions are mapped to a react-hook-form, the expected default values should be set correctly. However, when default values are in an array format, the form does not update as it should.

Here's a simplified code structure that replicates this issue:

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

In this code, you might notice that the controller for the select dropdown does not update correctly when the form is submitted, primarily because the default values are set as an array.

The Solution

Adjusting Default Values

The root of the issue lies in the format of the default values. Instead of using an array, you can encapsulate your questions within an object. This enables React Hook Form to interact with the default values correctly and ensures the controller components can update their state as expected.

Updated Code Example

Here's how you can refactor the initial code to fix the update issue:

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

Key Changes Made

Enclosed Questions in an Object: By changing the defaultValues from an array to an object ({ questions }), we align better with how React Hook Form expects form state to be structured.

Updated the Controller Name: The name for the controller has also been updated to questions.0.value which correctly targets the nested structure of your values.

Conclusion

By understanding the structure required by React Hook Form and adjusting your default values accordingly, you can ensure that your dynamically generated forms work flawlessly, without running into issues with state management. If you're still facing challenges, make sure to double-check the structure and labels you're using within your form.

Implementing these changes should provide a much smoother development experience and help you get your forms up and running in no time.

Happy coding!