function FileWidget::processMultiple

Form API callback: Processes a group of file_generic field elements.

Adds the weight field to each row so it can be ordered and adds a new Ajax wrapper around the entire group so it can be replaced all at once.

This method on is assigned as a #process callback in formMultipleElements() method.

File

core/modules/file/src/Plugin/Field/FieldWidget/FileWidget.php, line 470

Class

FileWidget

Plugin implementation of the 'file_generic' widget.

Namespace

Code

public static function processMultiple($element, FormStateInterface $form_state, $form) {
    $element_children = Element::children($element, TRUE);
    $count = count($element_children);
    // Count the number of already uploaded files, in order to display new
    // items in \Drupal\file\Element\ManagedFile::uploadAjaxCallback().
    if (!$form_state->isRebuilding()) {
        $count_items_before = 0;
        foreach ($element_children as $children) {
            if (!empty($element[$children]['#default_value']['fids'])) {
                $count_items_before++;
            }
        }
        $form_state->set('file_upload_delta_initial', $count_items_before);
    }
    foreach ($element_children as $delta => $key) {
        if ($key != $element['#file_upload_delta']) {
            $description = static::getDescriptionFromElement($element[$key]);
            $element[$key]['_weight'] = [
                '#type' => 'weight',
                '#title' => $description ? new TranslatableMarkup('Weight for @title', [
                    '@title' => $description,
                ]) : new TranslatableMarkup('Weight for new file'),
                '#title_display' => 'invisible',
                '#delta' => $count,
                '#default_value' => $delta,
            ];
        }
        else {
            // The title needs to be assigned to the upload field so that validation
            // errors include the correct widget label.
            $element[$key]['#title'] = $element['#title'];
            $element[$key]['_weight'] = [
                '#type' => 'hidden',
                '#default_value' => $delta,
            ];
        }
    }
    // Add a new wrapper around all the elements for Ajax replacement.
    $element['#prefix'] = '<div id="' . $element['#id'] . '-ajax-wrapper">';
    $element['#suffix'] = '</div>';
    return $element;
}