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- <?php
- namespace Drupal\Core\Render\Element;
- use Drupal\Core\Render\Element;
- /**
- * Provides a form element for an HTML 'hidden' input element.
- *
- * Specify either #default_value or #value but not both.
- *
- * Properties:
- * - #default_value: The initial value of the form element. JavaScript may
- * alter the value prior to submission.
- * - #value: The value of the form element. The Form API ensures that this
- * value remains unchanged by the browser.
- *
- * Usage example:
- * @code
- * $form['entity_id'] = array('#type' => 'hidden', '#value' => $entity_id);
- * @endcode
- *
- * @see \Drupal\Core\Render\Element\Value
- *
- * @FormElement("hidden")
- */
- class Hidden extends FormElement {
- /**
- * {@inheritdoc}
- */
- public function getInfo() {
- $class = get_class($this);
- return [
- '#input' => TRUE,
- '#process' => [
- [$class, 'processAjaxForm'],
- ],
- '#pre_render' => [
- [$class, 'preRenderHidden'],
- ],
- '#theme' => 'input__hidden',
- ];
- }
- /**
- * Prepares a #type 'hidden' render element for input.html.twig.
- *
- * @param array $element
- * An associative array containing the properties of the element.
- * Properties used: #name, #value, #attributes.
- *
- * @return array
- * The $element with prepared variables ready for input.html.twig.
- */
- public static function preRenderHidden($element) {
- $element['#attributes']['type'] = 'hidden';
- Element::setAttributes($element, ['name', 'value']);
- return $element;
- }
- }
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