function ManagedFile::processManagedFile

Render API callback: Expands the managed_file element type.

Expands the file type to include Upload and Remove buttons, as well as support for a default value.

File

core/modules/file/src/Element/ManagedFile.php, line 214

Class

ManagedFile

Provides an AJAX/progress aware widget for uploading and saving a file.

Namespace

Code

public static function processManagedFile(&$element, FormStateInterface $form_state, &$complete_form) {
    // This is used sometimes so let's implode it just once.
    $parents_prefix = implode('_', $element['#parents']);
    $fids = $element['#value']['fids'] ?? [];
    // Set some default element properties.
    $element['#progress_indicator'] = empty($element['#progress_indicator']) ? 'none' : $element['#progress_indicator'];
    $element['#files'] = !empty($fids) ? File::loadMultiple($fids) : [];
    $element['#tree'] = TRUE;
    // Generate a unique wrapper HTML ID.
    $ajax_wrapper_id = Html::getUniqueId('ajax-wrapper');
    $ajax_settings = [
        'callback' => [
            static::class,
            'uploadAjaxCallback',
        ],
        'options' => [
            'query' => [
                'element_parents' => implode('/', $element['#array_parents']),
            ],
        ],
        'wrapper' => $ajax_wrapper_id,
        'effect' => 'fade',
        'progress' => [
            'type' => $element['#progress_indicator'],
            'message' => $element['#progress_message'],
        ],
    ];
    // Set up the buttons first since we need to check if they were clicked.
    $element['upload_button'] = [
        '#name' => $parents_prefix . '_upload_button',
        '#type' => 'submit',
        '#value' => t('Upload'),
        '#attributes' => [
            'class' => [
                'js-hide',
            ],
        ],
        '#validate' => [],
        '#submit' => [
            'file_managed_file_submit',
        ],
        '#limit_validation_errors' => [
            $element['#parents'],
        ],
        '#ajax' => $ajax_settings,
        '#weight' => -5,
    ];
    // Force the progress indicator for the remove button to be either 'none' or
    // 'throbber', even if the upload button is using something else.
    $ajax_settings['progress']['type'] = $element['#progress_indicator'] == 'none' ? 'none' : 'throbber';
    $ajax_settings['progress']['message'] = NULL;
    $ajax_settings['effect'] = 'none';
    $element['remove_button'] = [
        '#name' => $parents_prefix . '_remove_button',
        '#type' => 'submit',
        '#value' => $element['#multiple'] ? t('Remove selected') : t('Remove'),
        '#validate' => [],
        '#submit' => [
            'file_managed_file_submit',
        ],
        '#limit_validation_errors' => [
            $element['#parents'],
        ],
        '#ajax' => $ajax_settings,
        '#weight' => 1,
    ];
    $element['fids'] = [
        '#type' => 'hidden',
        '#value' => $fids,
    ];
    // Add progress bar support to the upload if possible.
    if ($element['#progress_indicator'] == 'bar' && extension_loaded('uploadprogress')) {
        $upload_progress_key = mt_rand();
        $element['UPLOAD_IDENTIFIER'] = [
            '#type' => 'hidden',
            '#value' => $upload_progress_key,
            '#attributes' => [
                'class' => [
                    'file-progress',
                ],
            ],
            // Uploadprogress extension requires this field to be at the top of
            // the form.
'#weight' => -20,
        ];
        // Add the upload progress callback.
        $element['upload_button']['#ajax']['progress']['url'] = Url::fromRoute('file.ajax_progress', [
            'key' => $upload_progress_key,
        ]);
        // Set a custom submit event so we can modify the upload progress
        // identifier element before the form gets submitted.
        $element['upload_button']['#ajax']['event'] = 'fileUpload';
    }
    // Use a manually generated ID for the file upload field so the desired
    // field label can be associated with it below. Use the same method for
    // setting the ID that the form API autogenerator does.
    // @see \Drupal\Core\Form\FormBuilder::doBuildForm()
    $id = Html::getUniqueId('edit-' . implode('-', array_merge($element['#parents'], [
        'upload',
    ])));
    // The file upload field itself.
    $element['upload'] = [
        '#name' => 'files[' . $parents_prefix . ']',
        '#type' => 'file',
        // This #title will not actually be used as the upload field's HTML label,
        // since the theme function for upload fields never passes the element
        // through theme('form_element'). Instead the parent element's #title is
        // used as the label (see below). That is usually a more meaningful label
        // anyway.
'#title' => t('Choose a file'),
        '#title_display' => 'invisible',
        '#id' => $id,
        '#size' => $element['#size'],
        '#multiple' => $element['#multiple'],
        '#theme_wrappers' => [],
        '#weight' => -10,
        '#error_no_message' => TRUE,
    ];
    if (!empty($element['#accept'])) {
        $element['upload']['#attributes'] = [
            'accept' => $element['#accept'],
        ];
    }
    // Indicate that $element['#title'] should be used as the HTML label for the
    // file upload field.
    $element['#label_for'] = $element['upload']['#id'];
    if (!empty($fids) && $element['#files']) {
        foreach ($element['#files'] as $delta => $file) {
            $file_link = [
                '#theme' => 'file_link',
                '#file' => $file,
            ];
            if ($element['#multiple']) {
                $element['file_' . $delta]['selected'] = [
                    '#type' => 'checkbox',
                    '#title' => \Drupal::service('renderer')->renderInIsolation($file_link),
                ];
            }
            else {
                $element['file_' . $delta]['filename'] = $file_link + [
                    '#weight' => -10,
                ];
            }
            // Anonymous users who have uploaded a temporary file need a
            // non-session-based token added so $this->valueCallback() can check
            // that they have permission to use this file on subsequent submissions
            // of the same form (for example, after an Ajax upload or form
            // validation error).
            if ($file->isTemporary() && \Drupal::currentUser()->isAnonymous()) {
                $element['file_' . $delta]['fid_token'] = [
                    '#type' => 'hidden',
                    '#value' => Crypt::hmacBase64('file-' . $delta, \Drupal::service('private_key')->get() . Settings::getHashSalt()),
                ];
            }
        }
    }
    // Add the extension list to the page as JavaScript settings.
    if (isset($element['#upload_validators']['FileExtension']['extensions'])) {
        $allowed_extensions = $element['#upload_validators']['FileExtension']['extensions'];
        $extension_list = implode(',', array_filter(explode(' ', $allowed_extensions)));
        $element['upload']['#attached']['drupalSettings']['file']['elements']['#' . $id] = $extension_list;
    }
    // Prefix and suffix used for Ajax replacement.
    $element['#prefix'] = '<div id="' . $ajax_wrapper_id . '">';
    $element['#suffix'] = '</div>';
    return $element;
}