function hook_ENTITY_TYPE_prepare_form

Acts on a particular type of entity object about to be in an entity form.

This can be typically used to pre-fill entity values or change the form state before the entity form is built. It is invoked just once when first building the entity form. Rebuilds will not trigger a new invocation.

Parameters

\Drupal\Core\Entity\EntityInterface $entity: The entity that is about to be shown on the form.

$operation: The current operation.

\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form.

See also

\Drupal\Core\Entity\EntityForm::prepareEntity()

hook_entity_prepare_form()

Related topics

File

core/lib/Drupal/Core/Entity/entity.api.php, line 1856

Code

function hook_ENTITY_TYPE_prepare_form(\Drupal\Core\Entity\EntityInterface $entity, $operation, \Drupal\Core\Form\FormStateInterface $form_state) {
    if ($operation == 'edit') {
        $entity->label->value = 'Altered label';
        $form_state->set('label_altered', TRUE);
    }
}