This was a small tutorial for showing at Amsterdam.scala meetup. http://www.meetup.com/amsterdam-scala/events/231442786/
In particular, it links in libraries that are indispensable in being productive working with Scala.js. Intended to laying down a keel or as a starting point for further build. Already added is the Haoyi's Workbench sbt plug-in. It spins up a local Spray web server on (by default) localhost:12345, whenever you're in the SBT console. Navigate to localhost:12345/target/scala-2.11/classes/index-dev.html in the browser and it'll show a simple page tell you it's alive. You can access any file within your project directory by going to localhost:12345/path/to/file in a browser. The console of the browser will mirror the sbt's spamlog.
To get started, run sbt ~fastOptJS in this example project. This should download dependencies and prepare the relevant javascript files. If you open localhost:12345/target/scala-2.11/classes/index-dev.html in your browser, it will show the demo. You can then edit the application and see the updates be sent live to the browser without needing to refresh the page.
Run sbt fullOptJS and open up index-opt.html for an optimized (~200kb) version of the final application, useful for final publication. The auto-deployment function of the sbt ~fastOptJS is in that page not incorporated.
Run sbt run to execute the main method with http://phantomjs.org/ installed. Or run example.ScalaJSExample().main() in the browser console.