Callback invoked when file was selected and is added to this widget. See also FileUploadCfg.onAdd.
The file that was selected for the upload.
Callback that needs to be invoked with the file that should be added to the upload queue.
Callback that is invoked when a file upload was canceled. See also FileUploadCfg.oncancel.
Callback that is invoked after a file was uploaded to the server successfully. See also FileUploadCfg.oncomplete.
Callback that is invoked when a file could not be uploaded to the server. See also FileUploadCfg.onerror.
Callback that is invoked at the beginning of a file upload, when a file is sent to the server. See also FileUploadCfg.onstart.
Callback to execute before the files are sent. If this callback returns false, the file upload request is not started. See also FileUploadCfg.onupload.
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