interface FormElementInterface in Drupal 8

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
    • interface \Drupal\Core\Render\Element\FormElementInterface

See also

\Drupal\Core\Render\ElementInfoManager

\Drupal\Core\Render\Element\FormElement

\Drupal\Core\Render\Annotation\FormElement

Plugin API

Related topics

Render API overview

Overview of the Theme system and Render API.

1 file declares its use of FormElementInterface

ElementInfoManager.php in core/lib/Drupal/Core/Render/ElementInfoManager.php

File

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

Namespace

Drupal\Core\Render\Element

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

Name	Modifiers	Type	Description	Overrides
ElementInterface::getInfo	public	function	Returns the element properties for this element.	56
ElementInterface::setAttributes	public static	function	Sets a form element's class attribute.	1
FormElementInterface::valueCallback	public static	function	Determines how user input is mapped to an element's #value property.	1
PluginInspectionInterface::getPluginDefinition	public	function	Gets the definition of the plugin implementation.	4
PluginInspectionInterface::getPluginId	public	function	Gets the plugin_id of the plugin instance.	2