scala.js

问题 Fiddling with ScalaJS, I am trying to achieve the following, ie. create a custom web component skeleton: class DocumentPreview extends HTMLElement { static get observedAttributes() { return []; } constructor() { super(); this.root = this.attachShadow({ mode: "open"}); } connectedCallback() { let x = document.querySelector('link[rel="import"]#templates').import; this.root.appendChild(x.querySelector("#document-preview").content.cloneNode(true)); } disconnectedCallback() { }

问题 Please consider a scala.js application which runs in the browser and consists of a main program and a web worker. The main thread delegates long running operations to the web worker by passing messages that contain the names of methods and the parameters required to invoke them. The worker passes method return values back to the main thread in the form of response messages. In simpler terms, this program abstracts web worker messaging so that code in the main thread can call methods in the

问题 I am getting a bunch of linker errors when trying to link to FastParse in a Scala project which I've just tried to build a ScalaJS web app in. I added the ScalaJS dependency for FastParse into my build.sbt: here's approximately the relevant line (full file here): libraryDependencies ++= Seq( "com.lihaoyi" %%% "fastparse" % "0.4.1" ) My errors are voluminous, but here's a representative one: [error] Referring to non-existent class fastparse.Implicits$Repeater$ [error] called from parsers

问题 I've been using scalajs-dom v 0.8.1 and trying to mix webjars within my SBT project. When I do this, I'm getting one final ambiguous JS reference that I can't figure out. I think it is between the webjars I want to use (that include jquery v 2.1.4) and scala-js. I tried using the ManifestFilters SBT filter but it does not seem to help (or I don't know the correct syntax). Does anyone have a useful way to debug these kinds of errors? (see below for SBT output when issuing the 'fastOptJS' task)

问题 We can easily use %%% in a build.sbt in a scalajs project, like: libraryDependencies += "com.lihaoyi" %%% "utest" % "0.3.0" % "test" (live demo: https://github.com/scala-js/scala-js-pickling/blob/master/build.sbt#L92) But when I try to use project/Build.scala to write the same build file, it can't compile, and I've no idea how to import the %%% : import org.scalajs.sbtplugin.cross.{CrossType, CrossProject} import sbt._ import Keys._ object Build extends sbt.Build { lazy val crossProject =

问题 I'm struggling resolving some Javascript library dependency clashes in the following build.sbt file: lazy val root = project.in(file(".")).enablePlugins(ScalaJSPlugin) scalaVersion := "2.11.7" libraryDependencies ++= Seq( "org.scala-js" %%% "scalajs-java-time" % "0.1.0", "org.querki" %%% "jquery-facade" % "0.10" ) jsDependencies ++= Seq( "org.webjars.bower" % "jquery" % "3.0.0-beta1" / "jquery.js" ) When running the fastOptJS task I'm getting the following error message: [trace] Stack trace

问题 In the search for ways to make Java libraries accessible to both the JavaScript and JVM sides of Scala.js cross-built projects, please consider the following experiment: Imagine that a Scala.js project needs advanced matrix math capabilities such as Singular Value Decomposition. Although the JavaScript world has Numeric.js and the JVM world has many options, JAMA not least among them, no cross building Scala.js solution exists at the time of this question's formulation. What options do we

问题 A JSON string: { "name": "Mike", "age": 111 } A case class: case class User(name:String, age:Int) If I use scala, there are many libraries can let me convert the JSON to the case class and vice versa, but they can't be used in scala.js. How to do this work in scala.js? 回答1: Use one of the pickling libraries that work with Scala.js. The following two produce well-behaved and predictable JSON: uPickle Prickle 回答2: Circe has more than 1000 stars: https://github.com/circe/circe 来源： https:/

问题 Say I have two sub-projects, lib1 and lib2 with build.sbt s that look like this: lazy val libX = crossProject.in(file(".")).settings( ... // a bunch of settings ).jvmSettings( ... // a bunch of settings ).jsSettings( ... // a bunch of settings ) lazy val libXJVM = apiClient.jvm lazy val libXJS = apiClient.js I need to use them in another large multi-module project so that lib2 depends on lib1 . If I try this in the main build.sbt : lazy val lib1 = crossProject.in(file("lib1")) lazy val lib2 =

问题 I need to build a js file from sjsir files at runtime to implement a system of plugins, so that it can't be done at compile time with the rest of my compilation. I used to implement the same process in 0.6.3 with the following code, but it seems to be deprecated. What algorithm do you recommand to achieve the same action with 0.6.13 ? Thanks val scalajsLib = copyJar("scalajs-library_2.11-0.6.3") val semantics = org.scalajs.core.tools.sem.Semantics.Defaults val partialClasspath =