1 files changed, 39 insertions, 0 deletions
diff --git a/mavigator-cockpit/src/main/scala/mavigator/index/Util.scala b/mavigator-cockpit/src/main/scala/mavigator/index/Util.scala
new file mode 100644
index 0000000..16f3d5d
--- /dev/null
+++ b/mavigator-cockpit/src/main/scala/mavigator/index/Util.scala
@@ -0,0 +1,39 @@
+package mavigator.index
+
+import scala.language.implicitConversions
+
+import org.scalajs.dom.html
+
+import rx._
+
+import scala.util.Try
+import scala.util.Success
+import scala.util.Failure
+
+import scalatags.JsDom.all._
+
+object Util {
+  
+  /**
+   * Copied from https://github.com/lihaoyi/workbench-example-app/blob/todomvc/src/main/scala/example/Framework.scala
+   *
+   * Sticks some Rx into a Scalatags fragment, which means hooking up an Obs
+   * to propagate changes into the DOM via the element's ID. Monkey-patches
+   * the Obs onto the element itself so we have a reference to kill it when
+   * the element leaves the DOM (e.g. it gets deleted).
+   */
+  implicit def rxMod[T <: html.Element](r: Rx[HtmlTag]): Frag = {
+    def rSafe = r.toTry match {
+      case Success(v) => v.render
+      case Failure(e) => span(e.toString, backgroundColor := "red").render
+    }
+    var last = rSafe
+    Obs(r, skipInitial = true) {
+      val newLast = rSafe
+      last.parentElement.replaceChild(newLast, last)
+      last = newLast
+    }
+    bindNode(last)
+  }
+
+}