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I need to know how to use hook_form_alter in .theme file as i have to alter the form fields related to user_register_form.

I tried putting the below code in the .theme file but it does not even reach the function

/**
 * Implements hook_form_alter().
 */
function hook_form_alter(&$form, FormStateInterface $form_state, $form_id) {

  // Adding custom validation for the welcome page type field.
  if ($form_id == 'user_register_form') {
     print_r('Reaching in here');exit;
  }
} 
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If you want to alter a specific form, and you know the ID, use hook_form_FORM_ID_alter() rather than the generic version:

function THEMENAME_form_user_register_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  // Add alterations specific to the user registration form
}

Make sure you clear the cache after renaming the function.

  • This worked well Great Thanks. Though i had to use the interface : use Drupal\Core\Form\FormStateInterface; – Jignesh Rawal Sep 4 '18 at 13:08

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