drupal-form-alter
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How to install drupal-form-alter?
edutrul/drupal-ai/drupal-form-alter
$npx -y skills add edutrul/drupal-ai --skill drupal-form-alterDrupal form alter patterns — hook_form_alter, hook_form_FORM_ID_alter, OOP hooks, hiding fields with access, changing required/default values, and adding validate or submit handlers.
SKILL.md
| 1 | # Drupal Form Alter |
| 2 | |
| 3 | ## OOP Hook (Drupal 10.3+ / 11) |
| 4 | |
| 5 | ```php |
| 6 | // src/Hook/MyModuleHooks.php |
| 7 | namespace Drupal\my_module\Hook; |
| 8 | |
| 9 | use Drupal\Core\Hook\Attribute\Hook; |
| 10 | use Drupal\Core\Form\FormStateInterface; |
| 11 | |
| 12 | final class MyModuleHooks { |
| 13 | |
| 14 | #[Hook('form_alter')] |
| 15 | public function formAlter(array &$form, FormStateInterface $form_state, string $form_id): void { |
| 16 | if ($form_id === 'node_article_form' || $form_id === 'node_article_edit_form') { |
| 17 | // Alter the article node form. |
| 18 | $form['title']['#description'] = t('Enter a descriptive title.'); |
| 19 | } |
| 20 | } |
| 21 | |
| 22 | // Target a specific form more efficiently |
| 23 | #[Hook('form_node_article_form_alter')] |
| 24 | public function formNodeArticleFormAlter(array &$form, FormStateInterface $form_state): void { |
| 25 | $form['#validate'][] = [MyModuleHooks::class, 'validateArticleForm']; |
| 26 | $form['actions']['submit']['#submit'][] = [MyModuleHooks::class, 'submitArticleForm']; |
| 27 | } |
| 28 | |
| 29 | } |
| 30 | ``` |
| 31 | |
| 32 | ## Common Alterations |
| 33 | |
| 34 | ```php |
| 35 | // Make a field required |
| 36 | $form['field_subtitle']['widget'][0]['value']['#required'] = TRUE; |
| 37 | |
| 38 | // Add a field default value |
| 39 | $form['field_subtitle']['widget'][0]['value']['#default_value'] = 'Default'; |
| 40 | |
| 41 | // Hide a field |
| 42 | $form['field_internal']['#access'] = FALSE; |
| 43 | |
| 44 | // Add a CSS class |
| 45 | $form['#attributes']['class'][] = 'my-custom-form'; |
| 46 | |
| 47 | // Change submit button label |
| 48 | $form['actions']['submit']['#value'] = t('Save Article'); |
| 49 | |
| 50 | // Add a custom submit handler (runs AFTER default) |
| 51 | $form['actions']['submit']['#submit'][] = '::mySubmitHandler'; |
| 52 | |
| 53 | // Prepend a custom validate handler |
| 54 | array_unshift($form['#validate'], '::myValidateHandler'); |
| 55 | ``` |
| 56 | |
| 57 | ## Get Form Object |
| 58 | |
| 59 | ```php |
| 60 | $form_object = $form_state->getFormObject(); |
| 61 | if ($form_object instanceof NodeForm) { |
| 62 | $node = $form_object->getEntity(); |
| 63 | } |
| 64 | ``` |
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