Try Dart 1 hour experience first draft

src/site/articles/trydart/examples/3-buttonbadge/piratebadge.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:html';
+
+InputElement inputNameElement;
+ButtonElement genButtonElement;
+
+void  main() {
+  inputNameElement = query('#inputName');
+  inputNameElement.onChange.listen(generateBadge);
+  
+  genButtonElement = query('#generateButton');
+  genButtonElement.onClick.listen(generateBadge);
+}
+
+void generateBadge(Event event) {
+  if (event.target == inputNameElement) {
+    query('#badgeName').text = inputNameElement.value;
+ } else {
+    query('#badgeName').text = 'Anne Bonney';
+ }
+}