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Learn how to implement form validation in React to prevent data submission when validation fails, using a custom `useForm` hook.
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How to Ensure Your Form Only Submits Valid Data in React using useForm Hook

When developing web applications using React, form handling becomes an essential part of ensuring that user input is accurate and reliable. One common issue developers face is that form data gets submitted even when the input fields do not meet the necessary validation criteria. This can lead to unwanted situations, such as receiving incomplete or incorrect submissions. In this guide, we will address this issue and explore how to ensure that your form only submits valid data.

The Problem

In the example at hand, a custom React hook form is set up with validation. However, the data from the form submits even when the fields are empty or invalid, leading to incorrect submissions. Here's a brief overview of the key components in play:

Form Component: Displays input fields and handles submissions.

useForm Hook: Manages form state, including values, errors, and submission status.

Validation Logic: Defines validation requirements for the input fields.

The goal is clear: we want the form submission to proceed only when all validation requirements are met.

The Solution

To ensure that your form only submits validated data, we need to make a change in the handleSubmit method within the useForm hook. The change involves validating the form data before proceeding with the submission process. Below are the necessary steps to implement this solution.

Step 1: Validate Input Fields

Firstly, invoke the validation function and check the returned errors. If there are errors present, set the errors state and immediately exit the function to prevent submission.

Here's how to modify the handleSubmit method:

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

Step 2: Implement Error Handling

Adding error handling helps inform users about what went wrong during the validation process. If the validation fails, the error messages can be displayed under the respective input fields. This ensures a better user experience and encourages users to correct their input.

Step 3: Displaying a Success Message

Once the data has been submitted successfully, you might want to inform the user that the submission was successful. In the solution above, we added an alert to confirm this. You can customize how this success message is displayed, such as using toast notifications or redirecting users to a success page.

Step 4: Testing Your Form

After implementing these changes, it’s essential to test your form rigorously to ensure that it behaves as expected. Check various scenarios, such as leaving fields empty, entering invalid email formats, and ensuring that the success message appears after valid submissions.

Conclusion

Handling form validation is critical in web development, particularly when dealing with user inputs. By enhancing your useForm hook with checks for validation errors prior to submission, you can ensure that your form only allows valid data to be sent. This not only improves the integrity of your data but also enhances the overall user experience on your application.

If you follow these steps, you should be able to implement a robust validation system within your React forms. Happy coding!