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<?php
namespace Drupal\Core\Render\Element;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Render\Element;
/**
* Provides a form element for uploading a file.
*
* If you add this element to a form the enctype="multipart/form-data" attribute
* will automatically be added to the form element.
*
* Properties:
* - #multiple: A Boolean indicating whether multiple files may be uploaded.
* - #size: The size of the file input element in characters.
*
* @FormElement("file")
*/
class File extends FormElement {
/**
* {@inheritdoc}
*/
public function getInfo() {
$class = get_class($this);
return [
'#input' => TRUE,
'#multiple' => FALSE,
'#process' => [
[$class, 'processFile'],
],
'#size' => 60,
'#pre_render' => [
[$class, 'preRenderFile'],
],
'#theme' => 'input__file',
'#theme_wrappers' => ['form_element'],
];
}
/**
* Processes a file upload element, make use of #multiple if present.
*/
public static function processFile(&$element, FormStateInterface $form_state, &$complete_form) {
if ($element['#multiple']) {
$element['#attributes'] = ['multiple' => 'multiple'];
$element['#name'] .= '[]';
}
return $element;
}
/**
* Prepares a #type 'file' render element for input.html.twig.
*
* For assistance with handling the uploaded file correctly, see the API
* provided by file.inc.
*
* @param array $element
* An associative array containing the properties of the element.
* Properties used: #title, #name, #size, #description, #required,
* #attributes.
*
* @return array
* The $element with prepared variables ready for input.html.twig.
*/
public static function preRenderFile($element) {
$element['#attributes']['type'] = 'file';
Element::setAttributes($element, ['id', 'name', 'size']);
static::setAttributes($element, ['js-form-file', 'form-file']);
return $element;
}
}