The Dropzone module provides FileAttachmentField, a robust HTML5 uploading interfaces for SilverStripe, allowing forms to save file uploads to DataObject instances.

• Upload on the frontend, or in the CMS, with one consistent interface
• Drag-and-drop uploading
• Automatic client-side thumbnailing
• Grid view / List view
• Upload progress
• Limit file count, file size, file type
• Permissions for removing/deleting files
• No jQuery dependency

The field instantiates similarly to UploadField, taking the name of the file relationship and a label, as the first two arguments. Once instantiated, there are many ways to configure the UI.

FileAttachmentField::create('MyFile', 'Upload a file')
  ->setView('grid')

If the form holding the upload field is bound to a record, (i.e. with loadDataFrom()), the upload field will automatically allow multiple files if the relation is a has_many or many_many. If the form is not bound to a record, you can use setMultiple(true).

Image-only uploads can be forced using the imagesOnly() method. If the form is bound to a record, and the relation points to an Image class, this will be automatically set.

FileAttachmentField::create('MyFiles', 'Upload some  files')
  ->setThumbnailHeight(180)
  ->setThumbnailWidth(180)
  ->setAutoProcessQueue(false) // do not upload files until user clicks an upload button
  ->setMaxFilesize(10) // 10 megabytes. Defaults to PHP's upload_max_filesize ini setting
  ->setAcceptedFiles(array('.pdf','.doc','.docx'))
  ->setPermissions(array(
    'delete' => false,
    'detach' => function () {
      return Member::currentUser() && Member::currentUser()->inGroup('editors');
    }
  ));

Image uploads get a few extra options.

FileAttachementField::create('MyImage','Upload an image')
    ->imagesOnly() // If bound to a record, with a relation to 'Image', this isn't necessary.
    ->setMaxResolution(50000000); // Do not accept images over 5 megapixels

Default values for most settings can be found in the config.yml file included with the module.

FileAttachmentField can be used as a replacement for UploadField in the CMS.

For custom integrations, you may want to access the UploadInterface object that manages the upload UI (see file_attachment_field.js). You can do that one of two ways:

• If you have jQuery installed, simply access the dropzoneInterface data property of the .dropzone element

$('#MyFileDropzone').data('dropzoneInterface').clear();

• If you are not using jQuery, the UploadInterface object is injected into the browser global window.dropzones, indexed by the id of your .dropzone element.

window.dropzones.MyFileDropzone.clear();

NB: The ID of the actual .dropzone element by default is the name of the form input, with 'Dropzone' appended to it, so FileAttachmentField::create('MyFile') creates a dropzone with an ID of 'MyFileDropzone'

Ring Uncle Cheese.