added the dom events API to the kotlin standard library and get it compiling as JS too (not unit tested yet mind you ;)

js/js.libraries/src/core/domEvents.kt

@@ -38,12 +38,8 @@ native public trait Event {
     }
 }
 
-native public trait EventListener {
-    public fun handleEvent(arg1: Event): Unit = js.noImpl
-}
-
 native public trait EventTarget {
-    public fun dispatchEvent(arg1: Event): Boolean = js.noImpl
+    public fun dispatchEvent(arg1: Event?): Boolean = js.noImpl
     public fun addEventListener(arg1: String?, arg2: EventListener, arg3: Boolean): Unit = js.noImpl
     public fun removeEventListener(arg1: String?, arg2: EventListener, arg3: Boolean): Unit = js.noImpl
 }

js/js.libraries/src/core/domEventsCode.kt

@@ -0,0 +1,15 @@
+package org.w3c.dom.events
+
+import org.w3c.dom.*
+import org.w3c.dom.views.*
+
+/*
+  TODO we should maybe update GeneratedJavaScriptStubs.kt to auto-create this file
+  too so that we can have the implementation code generated for JS
+
+  See: https://github.com/JetBrains/kotlin/tree/master/libraries/stdlib
+*/
+
+public trait EventListener {
+    public fun handleEvent(arg1: Event?): Unit = js.noImpl
+}

libraries/stdlib/src/kotlin/dom/DomEvents.kt

@@ -1,17 +1,33 @@
 package kotlin.dom
 
-import org.w3c.dom.Document
+import java.io.Closeable
 import org.w3c.dom.Node
 import org.w3c.dom.events.*
-import java.io.Closeable
 
+/**
+* Turns an event handler function into an [EventListener]
+*/
+fun eventHandler(handler: (Event) -> Unit): EventListener {
+    return EventListenerHandler(handler)
+}
 
-fun <T: Event> eventHandler(eventType: Class<T>, handler: (T) -> Unit): EventListener {
-    return object : EventListener {
-        public override fun handleEvent(e: Event?) {
-            if (e != null && eventType.isInstance(e)) {
-                handler(e as T)
-            }
+private class EventListenerHandler(val handler: (Event) -> Unit): EventListener {
+    public override fun handleEvent(e: Event?) {
+        if (e != null) {
+            handler(e)
+        }
+    }
+/*
+    TODO: needs KT-2507 fixed
+
+    public override fun toString(): String? = "EventListenerHandler($handler)"
+*/
+}
+
+fun mouseEventHandler(handler: (MouseEvent) -> Unit): EventListener {
+    return eventHandler { e ->
+        if (e is MouseEvent) {
+            handler(e)
         }
     }
 }
@@ -20,31 +36,37 @@ fun <T: Event> eventHandler(eventType: Class<T>, handler: (T) -> Unit): EventLis
  * Registers a handler on the named event
  */
 public fun Node?.on(name: String, capture: Boolean, handler: (Event) -> Unit): Closeable? {
-    return on(name, capture, javaClass<Event>(), handler)
+    return on(name, capture, eventHandler(handler))
 }
 
-public fun <T: Event> Node?.on(name: String, capture: Boolean, eventType: Class<T>, handler: (T) -> Unit): Closeable? {
+/**
+ * Registers an [EventListener] on the named event
+ */
+public fun Node?.on(name: String, capture: Boolean, listener: EventListener): Closeable? {
     return if (this is EventTarget) {
-        val target: EventTarget = this
-        val listener = eventHandler(eventType, handler)
-        target.addEventListener(name, listener, capture)
-        object: Closeable {
-            public override fun close() {
-                target.removeEventListener(name, listener, capture)
-            }
-
-            public override fun toString(): String? = "CloseableEventListener($target, $name)"
-        }
+        addEventListener(name, listener, capture)
+        CloseableEventListener(this, listener, name, capture)
     } else {
         null
     }
 }
 
+private class CloseableEventListener(val target: EventTarget, val listener: EventListener, val name: String, val capture: Boolean): Closeable {
+    public override fun close() {
+        target.removeEventListener(name, listener, capture)
+    }
+
+/*
+    TODO: needs KT-2507 fixed
+
+    public override fun toString(): String? = "CloseableEventListener($target, $name)"
+*/
+}
 
 public fun Node?.onClick(capture: Boolean = false, handler: (MouseEvent) -> Unit): Closeable? {
-    return on("click", capture, javaClass<MouseEvent>(), handler)
+    return on("click", capture, mouseEventHandler(handler))
 }
 
 public fun Node?.onDoubleClick(capture: Boolean = false, handler: (MouseEvent) -> Unit): Closeable? {
-    return on("dblclick", capture, javaClass<MouseEvent>(), handler)
+    return on("dblclick", capture, mouseEventHandler(handler))
 }

libraries/stdlib/test/org/jetbrains/kotlin/tools/GenerateJavaScriptStubs.kt

@@ -43,7 +43,11 @@ fun generateDomEventsAPI(file: File): Unit {
 
 
     val classes: List<Class<*>> = arrayList(javaClass<DocumentEvent>(), javaClass<Event>(),
-            javaClass<EventListener>(), javaClass<EventTarget>(),
+            // TODO see domEventsCode.kt we manually hand craft this for now
+            // to get the implementation in JS
+            //
+            // javaClass<EventListener>(),
+            javaClass<EventTarget>(),
             javaClass<MouseEvent>(), javaClass<MutationEvent>(),
             javaClass<UIEvent>())
 
@@ -77,7 +81,7 @@ import js.noImpl
 
         fun parameterTypeName(klass: Class<out Any?>?): String {
             val answer = simpleTypeName(klass)
-            return if (answer == "String" || answer.endsWith("DocumentType")) {
+            return if (answer == "String" || answer == "Event" || answer.endsWith("DocumentType")) {
                 answer + "?"
             } else answer
         }

libraries/tools/kotlin-js-library/pom.xml

@@ -44,9 +44,6 @@
                                     <fileset dir="${basedir}/../../stdlib/src/kotlin/dom">
                                         <include name="**/*.kt"/>
                                         <exclude name="**/*JVM.kt"/>
-
-                                        <!-- TODO get compiling ASAP when we can use Class<T> in JavaScript -->
-                                        <exclude name="**/DomEvents.kt"/>
                                     </fileset>
                                     <fileset dir="${basedir}/../../stdlib/src/kotlin/support">
                                         <include name="**/*.kt"/>