Is there any formfield to upload multiple files in custom frontend form

Questions
#1

In SS4,

I want to create a custom form in the front end with a field and this field can upload multiple files. But now, I can’t see any solution for this purpose.
I used UploadField, but I can’t get any data form to submit action.
I also used FileField, but its only support upload 1 file.
Please kindly take a look and let me know any solution for my issue.

Thank you very much,

#2

You’ll want to use a FileField with the “multiple” attribute. The name of the field must also contain brackets: (“Files”).

$Images = FileField::create('Images[]', 'Images')
  ->setAttribute('multiple', 'multiple');

File upload arrays are also strangely formatted in PHP. I recommend using a function to re-format the post data in your processor method, similar to the methods described by users on the PHP site. Here is the version that I used:

  /**
   * Re-arrange the $_FILES array to be more like $_POST
   * Allows for multiple file uploads to be handled more easily
   *
   * Example:
   * $_FILES['field']['name'][$i] becomes $_FILES['field'][$i]['name']
   *
   * @param array $filePostArray
   * @return array
   */
  function reArrayFiles($filePostArray)
  {
    $isMulti = is_array($filePostArray['name']);
    $fileCount = $isMulti ? count($filePostArray['name']) : 1;
    $fileKeys = array_keys($filePostArray);

    $newFileArray = [];
    for ($i = 0; $i < $fileCount; $i++) {
      foreach ($fileKeys as $key) {
        if ($isMulti) {
          $newFileArray[$i][$key] = $filePostArray[$key][$i];
        } else {
          $newFileArray[$i][$key] = $filePostArray[$key];
        }
      }
    }

    return $newFileArray;
  }
#3

I used bigfork/silverstripe-dropzone and evaluated lekoala/silverstripe-filepond.

These are modern, JS-driven form fields that handle upload of multiple files and save them in your model.