Question

我正在尝试使用ScalaJS显示高图图表。我可以使用文字表示法成功地做到这一点，

import org.scalajs.dom.{Event, document}

import scala.scalajs.js
import scala.scalajs.js.Dynamic.{literal => Lit}

object App {
  def main(args: Array[String]): Unit = {
    val dynamicOptions = Lit(
      "chart" -> Lit(
        "type" -> "bar"
      ),
      "title" -> Lit(
        "text" -> "Fruit Consumption"
      ),
      "xAxis" -> Lit(
        "categories" -> js.Array(
          "Apples",
          "Bananas",
          "Oranges"
        )
      ),
      "yAxis" -> Lit(
        "title" -> Lit(
          "text" -> "Fruit eaten"
        )
      ),
      "series" -> js.Array(
        Lit(
          "name" -> "Jane",
          "data" -> js.Array(1.0, 2.0, 4.0)
        ),
        Lit(
          "name" -> "John",
          "data" -> js.Array(5.0, 7.0, 3.0)
        )
      )
    )

    document.addEventListener("DOMContentLoaded", (e: Event) => {
      var chart = js.Dynamic.global.Highcharts.chart("highcharts", dynamicOptions)
    })
  }
}

然后我尝试在选项周围添加一些强类型：

import scala.scalajs.js

object Types {
  class Chart(val `type`: String) extends js.Object
  class Title(val text: String) extends js.Object
  class XAxis(val categories: js.Array[String]) extends js.Object
  class YAxis(val title: Title) extends js.Object

  class DataPoint(
    val name: String,
    val data: js.Array[Double],
  ) extends js.Object

  class Options(
    val chart: Chart,
    val title: Title,
    val xAxis: XAxis,
    val yAxis: YAxis,
    val series: js.Array[DataPoint]
  ) extends js.Object
}

...

import org.scalajs.dom.{Event, document}

import scala.scalajs.js

object AppS {
  import Types._

  def main(args: Array[String]): Unit = {
    val series = js.Array(
      new DataPoint(
        name = "Jane",
        data = js.Array(1.0, 2.0, 4.0)
      ),

      new DataPoint(
        name = "John",
        data = js.Array(5.0, 7.0, 3.0)
      )
    )

    val staticOptions = new Options(
      chart = new Chart("bar"),
      title = new Title("Fruit Consumption"),
      xAxis = new XAxis(js.Array(
        "Apples", "Bananas", "Oranges"
      )),
      yAxis = new YAxis(new Title("Fruit eaten")),
      series = series
    )

    document.addEventListener("DOMContentLoaded", (e: Event) => {
      var chart = js.Dynamic.global.Highcharts.chart("highcharts", staticOptions)
    })
  }
}

这不起作用，因为出现奇怪的highchart错误。但是，如果我对动态和静态类型的对象进行字符串化并记录它们，它们是相同的。我该如何最好地使用与文字符号相同的强类型？

ScalaJs-非本地JS对象与文字对象有何不同？

0 个答案: