使用 D3.js来自 Scala.js 的 selection.data

Using D3.js selection.data from Scala.js

本文关键字：js selection data 来自 D3 使用 Scala      更新时间：2023-09-26

我是D3.js和Scala的新手。我正在尝试将 Scala .js 外观用于 D3.js并且我想构建 HTML 表，如此处的示例所示。

任务的一部分是将指定的数据数组与当前选择联接。数组是二维scala.scalajs.js.Array。Scala.js API具有以下功能：

  def data(): js.Array[Datum] = js.native
  def data[NewDatum](data: js.Array[NewDatum]): Update[NewDatum] = js.native
  def data[NewDatum](data: js.Array[NewDatum], key: js.ThisFunction2[Datum|NewDatum,js.UndefOr[NewDatum], Int, String]): Update[NewDatum] = js.native
  def data[NewDatum <: Datum](data: js.Array[NewDatum], key: js.Function2[Datum, Int, String]): Update[NewDatum] = js.native
  def data[NewDatum](data: DatumFunction[js.Array[NewDatum]], key: js.ThisFunction2[Datum|NewDatum,js.UndefOr[NewDatum], Int, String]): Update[NewDatum] = js.native

AFAIK，我应该使用最后一种方法将数据作为DatumFunction，但我坚持： 

val cells = rows.selectAll("td")
  .data((selData: js.Array[String], i: Int, j: Int) => js.Array("1","2","3"), (d: String, i: Int) => d + "_" + i)
...

但是此代码无法编译。如何解决？

更新：

有一个编译器输出：

[error] Table.scala:56: overloaded method value data with alternatives:
[error]   [NewDatum](data: scala.scalajs.js.Function3[SelData,Int,Int,scala.scalajs.js.Array[NewDatum]], key: scala.scalajs.js.ThisFunction2[scala.scalajs.js.|[SelData,NewDatum],scala.scalajs.js.UndefOr[NewDatum],Int,String])org.singlespaced.d3js.selection.Update[NewDatum] <and>
[error]   [NewDatum <: SelData](data: scala.scalajs.js.Array[NewDatum], key: scala.scalajs.js.Function2[SelData,Int,String])org.singlespaced.d3js.selection.Update[NewDatum] <and>
[error]   [NewDatum](data: scala.scalajs.js.Array[NewDatum], key: scala.scalajs.js.ThisFunction2[scala.scalajs.js.|[SelData,NewDatum],scala.scalajs.js.UndefOr[NewDatum],Int,String])org.singlespaced.d3js.selection.Update[NewDatum] <and>
[error]   [NewDatum](data: scala.scalajs.js.Array[NewDatum])org.singlespaced.d3js.selection.Update[NewDatum] <and>
[error]   ()scala.scalajs.js.Array[SelData]
[error]  cannot be applied to ((scala.scalajs.js.Array[String], Int, Int) => scala.scalajs.js.Array[String], (String, Int) => String)
[error]     .data((selData: js.Array[String], i: Int, j: Int) => js.Array("1","2","3"), (d: String, i: Int) => d + "_" + i)
[error]      ^
[error] one error found
[error] (compile:compileIncremental) Compilation failed

更新 2：

我修改了代码：

val cells = rows.selectAll("td")
  .data((d: js.Array[js.Array[String]]) => js.Array("1","2","3"), (x: Any, y: js.UndefOr[String], z: Int) => "test")

并且编译成功，但现在我的控制台中有JS错误：

Uncaught scala.scalajs.runtime.UndefinedBehaviorError: An undefined behavior was detected: undefined is not an instance of java.lang.Integer
$throwClassCastException                                                  @ scalajsenv.js:192
$asInt                                                                    @ scalajsenv.js:620
$uI                                                                       @ scalajsenv.js:651
(anonymous function)                                                      @ Ops.scala:45
Aa.data                                                                   @ scala-js-tutorial-jsdeps.js:9209
$c_Ltutorial_webapp_Table$.drawTable__Lorg_singlespaced_d3js_Transition @ Ops.scala:45
$c_Ltutorial_webapp_Table$.main__V                                      @ Table.scala:18
$c_Ltutorial_webapp_Table$.$$js$exported$meth$main__O                    @ JSApp.scala:18
$c_Ltutorial_webapp_Table$.main                                         @ Table.scala:10
(anonymous function)                                                      @ scalajs-tutorial-fastopt.html:24

我使用了scala-js-d3。实际上，这是0.3.0版本的问题。

作者解决了0.3.1版中的问题，并给出了一个工作解决方案的示例：

package example
import org.singlespaced.d3js.Ops._
import org.singlespaced.d3js.d3
import scala.scalajs.js
object ScalaJSExample extends js.JSApp {
  def main(): Unit = {
    /**
      * Adapted from https://github.com/mbostock/d3/wiki/Selections#data
      */
    val matrix = js.Array(
      js.Array(11975,  5871, 8916, 2868),
      js.Array( 1951, 10048, 2060, 6171),
      js.Array( 8010, 16145, 8090, 8045),
      js.Array( 1013,   990,  940, 6907)
    )
    val tr = d3.select("body").append("table").selectAll("tr")
      .data(matrix)
      .enter().append("tr")
    println("hihi")
    val td = tr.selectAll("td")
      .data( (d:js.Array[Int]) => { println(d); d; } )
      .enter().append("td")
      .text( (d:Int) => d.toString)
  }
}
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