How to do the drag & drop with the amazing scalajs web framework widok
Since some required drag & drop events have not been implemented in widok yet, you have to clone this repo: http://github.com/freewind/widok and publish it to local:
sbt publishLocal
After official widok add these events, you don't need to do this anymore
./sbt fastOptJS
open target/scala-2.11/classes/application.html
Then you can drag the image to different box.