Same filename in this branch
  1. 10 core/modules/file/src/Entity/File.php
  2. 10 core/lib/Drupal/Core/Render/Element/File.php
  3. 10 core/modules/file/src/Plugin/views/field/File.php
  4. 10 core/modules/file/src/Plugin/views/wizard/File.php
  5. 10 core/modules/media/src/Plugin/media/Source/File.php
  6. 10 core/modules/file/src/Plugin/migrate/source/d6/File.php
  7. 10 core/modules/file/src/Plugin/migrate/source/d7/File.php
Same filename and directory in other branches
  1. 8.9.x core/lib/Drupal/Core/Render/Element/File.php
  2. 9 core/lib/Drupal/Core/Render/Element/File.php

Namespace

Drupal\Core\Render\Element

File

core/lib/Drupal/Core/Render/Element/File.php
View source
<?php

namespace Drupal\Core\Render\Element;

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Render\Attribute\FormElement;
use Drupal\Core\Render\Element;
use Drupal\Core\Render\Element\FormElement as FormElementBase;

/**
 * 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.
 *
 * The value of this form element will always be an array of
 * \Symfony\Component\HttpFoundation\File\UploadedFile objects, regardless of
 * whether #multiple is TRUE or FALSE
 */

#[FormElement('file')]
class File extends FormElementBase {

  /**
   * {@inheritdoc}
   */
  public function getInfo() {
    $class = static::class;
    return [
      '#input' => TRUE,
      '#multiple' => FALSE,
      '#process' => [
        [
          $class,
          'processFile',
        ],
      ],
      '#size' => 60,
      '#pre_render' => [
        [
          $class,
          'preRenderFile',
        ],
      ],
      '#theme' => 'input__file',
      '#theme_wrappers' => [
        'form_element',
      ],
      '#value_callback' => [
        [
          $class,
          'valueCallback',
        ],
      ],
    ];
  }

  /**
   * 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.api.php.
   *
   * @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;
  }

  /**
   * {@inheritdoc}
   */
  public static function valueCallback(&$element, $input, FormStateInterface $form_state) {
    if ($input === FALSE) {
      return NULL;
    }
    $parents = $element['#parents'];
    $element_name = array_shift($parents);
    $uploaded_files = \Drupal::request()->files
      ->get('files', []);
    $uploaded_file = $uploaded_files[$element_name] ?? NULL;
    if ($uploaded_file) {

      // Cast this to an array so that the structure is consistent regardless of
      // whether #value is set or not.
      return (array) $uploaded_file;
    }
    return NULL;
  }

}

Classes

Namesort descending Description
File