scala.js

I'm using an build.sbt which has cross compile settings and basically is an adapted version of " Play with scala-js example " and having some trouble getting a clean setup for my tests. Specifically, when running my server tests, my client tests also get executed (which is something that I want to avoid). I followed the instructions from Cannot get uTest to see my tests and added libraryDependencies += "com.lihaoyi" %%% "utest" % "0.3.0" My tests for some reason didn't get executed until I added testFrameworks += new TestFramework("utest.runner.Framework") to every project definition. Also not

Basically I'm trying to figure out what I need to pass to the onload() method def selectedFile(e: ReactEventI) = { val reader = new dom.FileReader() reader.readAsText(e.currentTarget.files.item(0)) reader.onload( ) } You can assign a lambda to the onload handler: reader.onload = (e: UIEvent) => { // Cast is OK, since we are calling readAsText val contents = reader.result.asInstanceOf[String] println(contents) } Idiomatic Scala, with error handling Instead of using callbacks, I prefer to work with pattern matching and map like this: def printFileContent(file: dom.File) = readTextFile(file).map

I'm trying to export a Scala implementation of an algorithm for use in JavaScript. I'm using @JSExport . The algorithm works with Scala Char and Long values which are marked as opaque in the interoperability guide . I'd like to know (a) what this means; and (b) what the recommendation is for dealing with this. I presume it means I should avoid Char and Long and work with String plus a run-time check on length (or perhaps use a shapeless Sized collection) and Int instead. But other ideas welcome. More detail... The kind of code I'm looking at is: @JSExport("Foo") class Foo(val x: Int) {

I'm trying scala.js and I must say that it's completely impressed! However, I try to introduce it into our production little-by-little, working side-by-side with existing JavaScript code. One thing I'm struggling with is passing complex structures from JS to Scala. For example, I have ready-made JS object that I've got from the other JS module: h = { "someInt": 123, "someStr": "hello", "someArray": [ {"name": "a book", "price": 123}, {"name": "a newspaper", "price": 456} ], "someMap": { "Knuth": { "name": "The Art of Computer Programming", "price": 789 }, "Gang of Four": { "name": "Design

Is there any standard way to use Scala.js application as a libriary in CommonJS environment? And if not, can I patch generated js file for that purpose? Scala.js 0.6.13 and onward Put this in your build file: scalaJSModuleKind := ModuleKind.CommonJSModule Scala.js 0.6.5 to 0.6.12 Put this in your build file (explanation see below): scalaJSOutputWrapper := ("var __ScalaJSEnv = { exportsNamespace: exports };", "") Scala.js 0.5.4 to 0.6.4 You can tell Scala.js where to send the stuff it exports. To make a CommonJS module, simply prepend this: var __ScalaJSEnv = { exportsNamespace: exports }; to

I am trying to share a case class between server and client. I am using upickle on both ends. The objects and their data are nicely available on both ends. shared class case class Foo(var id : Long,var title: Description) However i need to export the fields of the case class on the client side. I could add the @ExportAll annotation, but that means pulling in the scalajs libraries on the server project. Is there perhaps a better way of exposing the members id and title to the javascript. tx., The right way to export things to JavaScript is to use the @JSExportAll annotation. You cannot, and