io.frontroute.LinkHandler.scala Maven / Gradle / Ivy

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package io.frontroute

import org.scalajs.dom
import org.scalajs.dom.raw._

import scala.scalajs.js
import scala.scalajs.js.annotation.JSGlobal

object LinkHandler {

  @js.native
  @JSGlobal("window")
  private object WindowWithRouteTo extends js.Object {
    var routeTo: js.UndefOr[js.Function1[String, Unit]] = js.native
  }

  private val clickListener: js.Function1[Event, Unit] = event => {
    findParent("A", event.target.asInstanceOf[dom.Node]).foreach { aParent =>
      val anchor = aParent.asInstanceOf[HTMLAnchorElement]
      val rel    = anchor.rel
      val href   = anchor.href
      val sameOrigin =
        href.startsWith("/") ||
          !href.startsWith("http://") && !href.startsWith("https://") ||
          dom.window.location.origin.exists(origin => href.startsWith(origin))

      if (sameOrigin && (js.isUndefined(rel) || rel == null || rel == "")) {
        event.preventDefault()
        BrowserNavigation.pushState(url = anchor.href)
      } else if (rel == "external") {
        event.preventDefault()
        dom.window.open(anchor.href)
      }
    }
  }

  private val routeTo: js.Function1[String, Unit] = (path: String) => BrowserNavigation.pushState(url = path)

  def install(): Unit = {
    WindowWithRouteTo.routeTo = routeTo
    dom.document.addEventListener("click", clickListener)
  }

  def uninstall(): Unit = {
    WindowWithRouteTo.routeTo = js.undefined
    dom.document.removeEventListener("click", clickListener)
  }

  @scala.annotation.tailrec
  private def findParent(nodeName: String, element: Node): js.UndefOr[Node] = {
    if (js.isUndefined(element) || element == null) {
      js.undefined
    } else {
      if (element.nodeName == nodeName) {
        element
      } else {
        findParent(nodeName, element.parentNode)
      }
    }
  }

}