When using React Hook Form, the isValid prop represents the validity state of the form. It indicates whether all the fields in the form are valid based on the defined validation rules. If the isValid prop keeps returning false, it means that one or more fields in the form have failed their validation rules.

To troubleshoot and resolve the issue, you can follow these steps:

  1. Check Validation Rules: Review the validation rules you have defined for each input field. Make sure that the rules are correct and that they cover all the possible validation scenarios for the form inputs.

  2. Check Field Names: Ensure that the field names you are using in the name attribute of each input component match the corresponding field names used in the validation schema. Mismatched field names can lead to validation issues.

  3. Validate Required Fields: If any of the fields are required, make sure you have specified the required validation rule for those fields.

  4. Validate Other Validation Rules: If you have specified other validation rules, such as minimum length, maximum length, pattern, etc., verify that they are correctly applied to the corresponding input fields.

  5. Check Error Messages: Ensure that you are displaying error messages for each field when they fail validation. Check that the error messages are correctly linked to the respective input fields using the errors object provided by React Hook Form.

  6. Validate Conditionally Shown Fields: If you have conditionally shown fields in the form, make sure that their validation is correctly applied when they are visible. Sometimes, conditionally shown fields might not get validated if they are hidden at the time of form submission.

  7. Check Submit Handler: Verify that the submit handler function is correctly handling the form submission. The isValid prop will be accurate only when the form is submitted.

  8. Ensure Proper Usage of Hook Methods: Double-check that you are using the correct hook methods such as useForm, useController, useFieldArray, etc., and that you are correctly integrating them into your form.

  9. Debugging: Use the errors object provided by React Hook Form to get more insights into the validation errors. Log the errors object to the console to see which fields are failing validation and the specific validation errors for each field.

Remember that React Hook Form will not trigger validation until the user interacts with the form inputs (e.g., by typing or blurring out of the input). If you need to trigger validation manually, you can use the trigger method from React Hook Form. For example:

const { handleSubmit, control, trigger } = useForm(); const onSubmit = async (data) => { // Manually trigger validation before form submission const isFormValid = await trigger(); if (isFormValid) { // Proceed with form submission // ... } };

By following these steps and debugging the validation process, you should be able to identify the cause of the isValid prop returning false and resolve the issue with React Hook Form validation.

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