* added Form.subscribeToUpdates(f: => Callback) to provide a hook to react on formUpdates

Author: torstenrudolf

README.md

@@ -16,12 +16,12 @@ flexibility of the form design.
 Currently it is available as a sonatype snapshot, add this to your build.sbt:
 
 ```
-libraryDependencies += "com.github.torstenrudolf.scalajs-react-form-binder" %%% "core" % "0.0.15-SNAPSHOT"
+libraryDependencies += "com.github.torstenrudolf.scalajs-react-form-binder" %%% "core" % "0.0.16-SNAPSHOT"
 ```
 
 If you want to use the materialui form-field descriptors, you'll need this as well:
 ```
-libraryDependencies += "com.github.torstenrudolf.scalajs-react-form-binder" %%% "extras" % "0.0.15-SNAPSHOT"
+libraryDependencies += "com.github.torstenrudolf.scalajs-react-form-binder" %%% "extras" % "0.0.16-SNAPSHOT"
 ```
 
 

build.sbt

@@ -3,7 +3,7 @@ def commonSettings: Project => Project =
   _.enablePlugins(ScalaJSPlugin)
     .settings(
       organization := "com.github.torstenrudolf.scalajs-react-form-binder",
-      version := "0.0.15-SNAPSHOT",
+      version := "0.0.16-SNAPSHOT",
       homepage := Some(url("https://github.com/torstenrudolf/scalajs-react-form-binder")),
       licenses += ("MIT", url("https://opensource.org/licenses/MIT")),
       scalaVersion := "2.11.8",

core/src/main/scala/torstenrudolf/scalajs/react/formbinder/Form.scala

@@ -29,6 +29,8 @@ trait Form[DataModel] {
 
   def resetAllFields: Callback
 
+  def subscribeToUpdates(cb: Callback): Unit
+
 }
 
 

core/src/main/scala/torstenrudolf/scalajs/react/formbinder/Macros.scala

@@ -443,6 +443,8 @@ trait FormAPI[T] extends Form[T] {
 
   private var _validatedFormData: Option[T] = None
   private var _formGlobalValidationResult: Option[ValidationResult] = None
+  private val _formOnChangeSubscribers: scala.collection.mutable.ListBuffer[Callback] =
+    scala.collection.mutable.ListBuffer.empty[Callback]
 
   private def formGlobalValidationResult: ValidationResult = _formGlobalValidationResult match {
     case Some(vr) => vr
@@ -491,7 +493,9 @@ trait FormAPI[T] extends Form[T] {
 
   def onChangeCB: Callback = {
     validate(showUninitializedError = false)
+
     formLayout.onChange(validatedData = _validatedFormData) >>
+      _formOnChangeSubscribers.foldLeft(Callback.empty)(_ >> _) >>
       forceGlobalValidationMessageUpdate.getOrElse(Callback.empty)
   }
 
@@ -551,6 +555,8 @@ trait FormAPI[T] extends Form[T] {
       case Failure(e) => throw FormUninitialized
     }
 
+  override def subscribeToUpdates(cb: Callback): Unit = _formOnChangeSubscribers.append(cb)
+
   private var forceGlobalValidationMessageUpdate: Option[Callback] = None
 
   override def globalValidationMessage: ReactNode = {