interface FormElementInterface

Provides an interface for form element plugins.

Form element plugins are a subset of render elements, specifically representing HTML elements that take input as part of a form. Form element plugins are discovered via the same mechanism as regular render element plugins. See \Drupal\Core\Render\Element\ElementInterface for general information about render element plugins.

Hierarchy

• interface \Drupal\Component\Plugin\PluginInspectionInterface; interface \Drupal\Core\Render\Element\RenderCallbackInterface
  • interface \Drupal\Core\Render\Element\ElementInterface extends \Drupal\Component\Plugin\PluginInspectionInterface \Drupal\Core\Render\Element\RenderCallbackInterface
    • interface \Drupal\Core\Render\Element\FormElementInterface extends \Drupal\Core\Render\Element\ElementInterface

Expanded class hierarchy of FormElementInterface

All classes that implement FormElementInterface

See also

\Drupal\Core\Render\ElementInfoManager

\Drupal\Core\Render\Element\FormElement

\Drupal\Core\Render\Annotation\FormElement

Plugin API

Related topics

File

core/lib/Drupal/Core/Render/Element/FormElementInterface.php, line 23

Namespace

interface FormElementInterface extends ElementInterface {
    
    /**
     * Determines how user input is mapped to an element's #value property.
     *
     * @param array $element
     *   An associative array containing the properties of the element.
     * @param mixed $input
     *   The incoming input to populate the form element. If this is FALSE,
     *   the element's default value should be returned.
     * @param \Drupal\Core\Form\FormStateInterface $form_state
     *   The current state of the form.
     *
     * @return mixed
     *   The value to assign to the element.
     */
    public static function valueCallback(&$element, $input, FormStateInterface $form_state);

}

Members