I want to upload a file and I have to use form element type as 'file'. In submit function I am not able to get any proper data related to the file which I am uploading. SO Can anyone please help me to resolve this. Please find the below code:

public function buildForm(array $form, FormStateInterface $form_state) {
  $form['test_CERTIFICATE'] = [
    '#type' => 'file',
    '#title' => $this->t('Certificate'),
    '#description' => $this->t('Your Certificate (.pem file)').': '.\Drupal::state()->get('test_CERTIFICATE_NAME'),           
  return parent::buildForm($form, $form_state);

Submit function:

public function submitForm(array &$form, FormStateInterface $form_state) {
  parent::submitForm($form, $form_state);

  $validators = array('file_validate_extensions' => array('pem'));
  $files = file_save_upload('test_CERTIFICATE', $validators, 'public://certfiles', FILE_EXISTS_REPLACE);
  $file = File::load($files[0]);
  if ($file) {
    kint($files); exit;
    // here control is not coming

I had the same problem with the file form element. Solved this by using managed_file and providing the upload location and validators in the form element:

$form['test_CERTIFICATE'] = [
  '#type' => 'managed_file',
  '#title' => $this->t('Certificate'),
  '#upload_location' => 'private://certfiles',
  '#upload_validators' => [
    'file_validate_extensions' => ['pem'],

Then in submit:

use Drupal\file\Entity\File;

$form_file = $form_state->getValue('test_CERTIFICATE', 0);
if (isset($form_file[0]) && !empty($form_file[0])) {
  $file = File::load($form_file[0]);
  • Hi, thank you for your suggestion. even I got success with this method. But here, how can I prevent entry of duplicate files in the public folder. Because of this reason I opted for "file" type. in this we can do by using file_save_upload so..
    – Suraj
    Jul 3 '17 at 6:15
  • The temporary file is deleted automatically, I think by default within 6 hours. If you don't want to wait you can delete it after you've saved the permanent file.
    – 4k4
    Jul 3 '17 at 6:28
  • I am not telling about temporary file buddy. if i uploaded same file twice, that time its keeping both the files in the public folder by appending random number to latest file. this type of duplication am telling.
    – Suraj
    Jul 3 '17 at 6:52
  • You could check for an existing file with the same name before you make the temporary file permanent.
    – 4k4
    Jul 3 '17 at 7:15

You can access files data uploaded through "file" field using the following code (from D8.5 core/modules/config/src/Form/ConfigImportForm.php)

$all_files = $this->getRequest()->files->get('files', []);
$file = $all_files['test_CERTIFICATE'];
$file_path = $file->getRealPath();
  • Would love to know reason for downvote. Unnecessarily complex, or bad practice?
    – almcnicoll
    Jul 7 '18 at 23:47
  • 2
    I believe this is a more correct to the question, when you use '#type' => 'file' this is the way to get the file.
    – andeersg
    Dec 3 '18 at 8:17
  • @almcnicoll The reason for the downvote was that there is no reason to get into this low level of file upload. It's just bad advice. Feb 11 '19 at 12:08
  • 4
    Upvoted. This is the clearest way of uploading unmanaged files. To obtain the original file name you may use $file_name = $file->getClientOriginalName(), and then save the file to the final location via file_unmanaged_copy($file_path, "PATH/$file_name");.
    – Michal Gow
    May 22 '19 at 10:53
  • 1
    Thanks for posting, CamelCode. In certain advanced implementations, this information is useful. Upvoted. Feb 6 '20 at 16:24

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