function file_managed_file_submit

Form submission handler for upload / remove buttons of managed_file elements.

See also

\Drupal\file\Element\ManagedFile::processManagedFile()

File

core/modules/file/file.module, line 1354

Code

function file_managed_file_submit($form, FormStateInterface $form_state) {
    // Determine whether it was the upload or the remove button that was clicked,
    // and set $element to the managed_file element that contains that button.
    $parents = $form_state->getTriggeringElement()['#array_parents'];
    $button_key = array_pop($parents);
    $element = NestedArray::getValue($form, $parents);
    // No action is needed here for the upload button, because all file uploads on
    // the form are processed by \Drupal\file\Element\ManagedFile::valueCallback()
    // regardless of which button was clicked. Action is needed here for the
    // remove button, because we only remove a file in response to its remove
    // button being clicked.
    if ($button_key == 'remove_button') {
        $fids = array_keys($element['#files']);
        // Get files that will be removed.
        if ($element['#multiple']) {
            $remove_fids = [];
            foreach (Element::children($element) as $name) {
                if (strpos($name, 'file_') === 0 && $element[$name]['selected']['#value']) {
                    $remove_fids[] = (int) substr($name, 5);
                }
            }
            $fids = array_diff($fids, $remove_fids);
        }
        else {
            // If we deal with single upload element remove the file and set
            // element's value to empty array (file could not be removed from
            // element if we don't do that).
            $remove_fids = $fids;
            $fids = [];
        }
        foreach ($remove_fids as $fid) {
            // If it's a temporary file we can safely remove it immediately, otherwise
            // it's up to the implementing module to remove usages of files to have them
            // removed.
            if ($element['#files'][$fid] && $element['#files'][$fid]->isTemporary()) {
                $element['#files'][$fid]->delete();
            }
        }
        // Update both $form_state->getValues() and FormState::$input to reflect
        // that the file has been removed, so that the form is rebuilt correctly.
        // $form_state->getValues() must be updated in case additional submit
        // handlers run, and for form building functions that run during the
        // rebuild, such as when the managed_file element is part of a field widget.
        // FormState::$input must be updated so that
        // \Drupal\file\Element\ManagedFile::valueCallback() has correct information
        // during the rebuild.
        $form_state->setValueForElement($element['fids'], implode(' ', $fids));
        NestedArray::setValue($form_state->getUserInput(), $element['fids']['#parents'], implode(' ', $fids));
    }
    // Set the form to rebuild so that $form is correctly updated in response to
    // processing the file removal. Since this function did not change $form_state
    // if the upload button was clicked, a rebuild isn't necessary in that
    // situation and calling $form_state->disableRedirect() would suffice.
    // However, we choose to always rebuild, to keep the form processing workflow
    // consistent between the two buttons.
    $form_state->setRebuild();
}