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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;
}
}