How do I alter the login form? [closed]

Question

I have used custom_module_form_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id); I get the form ID of other forms, but I don't get the login form $form_id inside the hook.

Answer 1

Try clearing cache and then visiting login page again, that should show Form ID. It will be hidden again when you refresh login page.

use \Drupal\Core\Form\FormStateInterface;

/**
 * Implements hook_form_alter().
 */
function [MODULE_NAME]_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  echo $form_id;
  switch ($form_id) {
    case 'user_login_form':
      // Do your code here to alter login form.
      break;
  }
}

Answer 2

function MYMODULE_form_user_login_form_alter(&$form, &$form_state, $form_id) {
  // you code here
}