play-scalajs.g8

by vmunier

Giter8 template to get started with Play and Scala.js.

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Play Framework with Scala.js

License Gitter

This is a Giter8 template showing how you can integrate a Play project with a Scala.js project.

Run the application

$ sbt new vmunier/play-scalajs.g8
$ cd play-scalajs
$ sbt
> project server
> run
$ open http://localhost:9000

The application contains three directories: *

server
Play application (server side) *
client
Scala.js application (client side) *
shared
Scala code that you want to share between the server and the client

Features

The application uses the sbt-web-scalajs sbt plugin and the scalajs-scripts library.

  • Run your application like a regular Play app
    • compile
      triggers the Scala.js
      fastOptJS
      task
    • run
      triggers the Scala.js
      fastOptJS
      task on page refresh
    • ~compile
      ,
      ~run
      , continuous compilation is also available
  • Compilation errors from the Scala.js projects are also displayed in the browser
  • Set
    scalaJSStage
    to
    FullOptStage
    when packaging your application for
    fullOptJS
    to be executed instead of
    fastOptJS
    :
    sbt 'set scalaJSStage in Global := FullOptStage' dist
    
  • Source maps
    • Open your browser dev tool to set breakpoints or to see the guilty line of code when an exception is thrown.
    • Source Maps are enabled in both
      fastOptJS
      and
      fullOptJS
      by default. If you wish to disable Source Maps in
      fullOptJS
      , then add
      scalaJSLinkerConfig in (Compile, fullOptJS) ~= (_.withSourceMap(false))
      in the Scala.js projects.

Load the server project at sbt startup

Add the following line to

build.sbt
if you wish to load the server project at sbt startup:
scala
onLoad in Global := (onLoad in Global).value.andThen(state => "project server" :: state)

Cleaning

The root project aggregates all the other projects by default. Use this root project to clean all the projects at once. ```shell $ sbt

clean ```

IDE integration

IntelliJ

In IntelliJ, open Project wizard, select

Import Project
, choose the root folder and click
OK
. Select
Import project from external model
option, choose
SBT project
and click
Next
. Select additional import options and click
Finish
. Make sure you use the IntelliJ Scala Plugin v2017.2.7 or higher. There are known issues with prior versions of the plugin.

Eclipse

  1. Add
    addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "5.2.4")
    to
    project/plugins.sbt
  2. Add the following lines to the
    server
    's settings in
    build.sbt
    :
    // Compile the project before generating Eclipse files, so that generated .scala or .class files for Twirl templates are present
    EclipseKeys.preTasks := Seq(compile in Compile)
    
  3. Run
    $ sbt "eclipse with-source=true"
  4. Inside Eclipse,
    File/Import/General/Existing project...
    , choose the root folder. Uncheck the third checkbox to only import client, server and shared/.jvm, click
    Finish
    . Alt text

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