Inside my .module file, I have created a hook for alter register_form and add a password field with a custom field-validation:

function xenforo_form_user_register_form_alter(&$form, DrupalCoreFormFormStateInterface $form_state) {   $form['password'] = array(     '#type' => 'password_confirm',     '#size' => 25,     '#required' => true,     '#element_validate' => array('check_password'),     ); } function check_password($element, &$form_state) {   if ($element['#value'] != 'test') {     form_error($element, t('Error: TEST'));   } } 

I use #element_validate, and when I submit my form with a bad value $element['#value'] != 'test', I don’t have an error and the registration is completed, why #element_validate don’t work here please ?

Thanks.

EDIT:

I have find a solution:

  function xenforo_form_user_register_form_alter(&$form, DrupalCoreFormFormStateInterface $form_state) {     $form['password'] = array(       '#type' => 'password_confirm',       '#size' => 25,       '#required' => true,       '#attributes' => array('autocomplete' => 'off'),       //'#element_validate' => array('check_password'),       '#process' => array('processPasswordConfirm'),     );   }    function processPasswordConfirm(&$element, DrupalCoreFormFormStateInterface $form_state, &$complete_form) {     $element['pass1'] =  array(       '#type' => 'password',       '#title' => t('Password'),       '#value' => empty($element['#value']) ? NULL : $element['#value']['pass1'],       '#required' => $element['#required'],       '#attributes' => array('class' => array('password-field')),     );     $element['pass2'] =  array(       '#type' => 'password',       '#title' => t('Confirm password'),       '#value' => empty($element['#value']) ? NULL : $element['#value']['pass2'],       '#required' => $element['#required'],       '#attributes' => array('class' => array('password-confirm')),     );     $element['#element_validate'] = array('check_password');     $element['#tree'] = TRUE;      return $element;   }    function check_password($element, &$form_state) {     if ($element['#value'] != 'test') {       //form_error($element, t('Error: TEST'));     }   } 

But I have again the error with form_error() and password as displayed as two field without

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