Rails - Jun 2010 - drag n drop desktop file to application as such in google

Is that possible to   " Drag n drop file from desktop to
upload   "  in Ruby on rails application

       for example :   google (gmail) drag n drop attachments same as
this feature .

        Drag and drop functionality  working but how to upload the
file to the application   ? through
ajax ? or other functionaltiy ?

         how to get file object through javascript which attributes
suits for  that ?

         how to implement this ?..........

        Any ideas  greatly appreciated .....




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