[package:mdv] Support binding to HTMLSelectElement.selectedIndex

pkg/mdv/lib/src/bindings.dart

Index: pkg/mdv/lib/src/bindings.dart
diff --git a/pkg/mdv/lib/src/bindings.dart b/pkg/mdv/lib/src/bindings.dart
index f2aa0ea09a3cb8b4a3c2ed8256bcffcc5dbbb624..8fdc1933ac513160cf7c5763efa21b4389366fe9 100644
--- a/pkg/mdv/lib/src/bindings.dart
+++ b/pkg/mdv/lib/src/bindings.dart
@@ -11,7 +11,8 @@ part of mdv;
 typedef void _ChangeHandler(value);
 
 abstract class _InputBinding {
-  final InputElement element;
+  // InputElement or SelectElement
+  final element;
   PathObserver binding;
   StreamSubscription _pathSub;
   StreamSubscription _eventSub;
@@ -51,7 +52,7 @@ abstract class _InputBinding {
     return fired.length == 1 ? Element.changeEvent : fired.first;
   }();
 
-  static Stream<Event> _getStreamForInputType(InputElement element) {
+  static Stream<Event> _getStreamForInputType(element) {
     switch (element.type) {
       case 'checkbox':
         return _checkboxEventType.forTarget(element);
@@ -65,76 +66,6 @@ abstract class _InputBinding {
   }
 }
 
-class _ValueBinding extends _InputBinding {
-  _ValueBinding(element, model, path) : super(element, model, path);
-
-  void valueChanged(value) {
-    element.value = value == null ? '' : '$value';
-  }
-
-  void updateBinding(e) {
-    binding.value = element.value;
-  }
-}
-
-class _CheckedBinding extends _InputBinding {
-  _CheckedBinding(element, model, path) : super(element, model, path);
-
-  void valueChanged(value) {
-    element.checked = _toBoolean(value);
-  }
-
-  void updateBinding(e) {
-    binding.value = element.checked;
-
-    // Only the radio button that is getting checked gets an event. We
-    // therefore find all the associated radio buttons and update their
-    // CheckedBinding manually.
-    if (element is InputElement && element.type == 'radio') {
-      for (var r in _getAssociatedRadioButtons(element)) {
-        var checkedBinding = _mdv(r)._checkedBinding;
-        if (checkedBinding != null) {
-          // Set the value directly to avoid an infinite call stack.
-          checkedBinding.binding.value = false;
-        }
-      }
-    }
-  }
-
-  // |element| is assumed to be an HTMLInputElement with |type| == 'radio'.
-  // Returns an array containing all radio buttons other than |element| that
-  // have the same |name|, either in the form that |element| belongs to or,
-  // if no form, in the document tree to which |element| belongs.
-  //
-  // This implementation is based upon the HTML spec definition of a
-  // "radio button group":
-  //   http://www.whatwg.org/specs/web-apps/current-work/multipage/number-state.html#radio-button-group
-  //
-  static Iterable _getAssociatedRadioButtons(element) {
-    if (!_isNodeInDocument(element)) return [];
-    if (element.form != null) {
-      return element.form.nodes.where((el) {
-        return el != element &&
-            el is InputElement &&
-            el.type == 'radio' &&
-            el.name == element.name;
-      });
-    } else {
-      var radios = element.document.queryAll(
-          'input[type="radio"][name="${element.name}"]');
-      return radios.where((el) => el != element && el.form == null);
-    }
-  }
-
-  // TODO(jmesserly): polyfill document.contains API instead of doing it here
-  static bool _isNodeInDocument(Node node) {
-    // On non-IE this works:
-    // return node.document.contains(node);
-    var document = node.document;
-    if (node == document || node.parentNode == document) return true;
-    return document.documentElement.contains(node);
-  }
-}
 
 // TODO(jmesserly): not sure what kind of boolean conversion rules to
 // apply for template data-binding. HTML attributes are true if they're