Utilizing a JavaScript Library in your Scala.js Project: A Step-by-Step Guide

I am currently following a tutorial on setting up dependencies in my Scala.js project. Here is the link to the tutorial:

  1. First and foremost, I have organized my project setup as shown below:

https://github.com/scala-js/scalajs-cross-compile-example

Without any modifications, everything runs smoothly when I input the following commands:

sbt> fooJS/run
sbt> fooJVM/run

  1. Now I want to import a specific library into my project:

  2. My goal is to execute this function:

    Plotly.newPlot('myDiv', data);

How can I accomplish this task?

The contents of my Main.scala file located within the js folder are as follows:

package example

object Main extends App {
  println(s"Using Scala.js version ${System.getProperty("java.vm.version")}")
}

I am aware that there is already a facade available for this library, however, I prefer to create my own facades for future projects and using this as a learning experience. I have gone through the tutorial mentioned here:

However, I must admit that I am having difficulty grasping the steps due to transitioning from a different language ecosystem.

javascriptscalascala.jscross-build

Answer №1

Describing the issues you are facing by saying "I do not follow those steps" may not be the most helpful approach.

The solution seems quite straightforward. There is a global Object named Plotly, which includes a method called newPlot. This method requires a String parameter and an array of objects containing data. Here's an example of how you can achieve this:

@js.native
@JSGlobal
object Plotly extends js.Object {
  def newPlot(id: String, data: js.Array[PlotData]) = js.native
}

In addition to defining the Plotly object type, you also need to outline what the structure of PlotData should be like. While the Plotly object type is implemented in JavaScript, the PlotData type will be implemented in Scala. Please refer to this guide for assistance.

For a plot of type scatter, the structure could be defined as follows:

case class PlotData(
  x: js.Array[Double],
  y: js.Array[Double]
) extends js.Object {
  def type: String = "scatter"
}

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