[mdv] Implement two-way binding to HTMLTextArea.value

pkg/mdv/lib/src/input_element.dart

 // Copyright (c) 2013, 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.
 
 part of mdv;
 
 /** Extensions to the [InputElement] API. */
 class _InputElementExtension extends _ElementExtension {
+  _ValueBinding _valueBinding;
+  _CheckedBinding _checkedBinding;
+
   _InputElementExtension(InputElement node) : super(node);
 
   InputElement get node => super.node;
 
-  _ValueBinding _valueBinding;
-
-  _CheckedBinding _checkedBinding;
-
   void bind(String name, model, String path) {
-    switch (name) {
+    switch (name.toLowerCase()) {
       case 'value':
         unbind('value');
         node.attributes.remove('value');
         _valueBinding = new _ValueBinding(node, model, path);
         break;
       case 'checked':
         unbind('checked');
         node.attributes.remove('checked');
         _checkedBinding = new _CheckedBinding(node, model, path);
         break;
       default:
         super.bind(name, model, path);
         break;
     }
   }
 
   void unbind(String name) {
-    switch (name) {
+    switch (name.toLowerCase()) {
       case 'value':
         if (_valueBinding != null) {
           _valueBinding.unbind();
           _valueBinding = null;
         }
         break;
       case 'checked':
         if (_checkedBinding != null) {
           _checkedBinding.unbind();
           _checkedBinding = null;
         }
         break;
       default:
         super.unbind(name);
         break;
     }
   }
 
   void unbindAll() {
     unbind('value');
     unbind('checked');
     super.unbindAll();
   }
 }
-
-class _ValueBinding extends _InputBinding {
-  _ValueBinding(element, model, path) : super(element, model, path);
-
-  InputElement get element => super.element;
-
-  void valueChanged(value) {
-    element.value = value == null ? '' : '$value';
-  }
-
-  void updateBinding(e) {
-    binding.value = element.value;
-  }
-}
-
-class _CheckedBinding extends _InputBinding {
-  _CheckedBinding(element, model, path) : super(element, model, path);
-
-  InputElement get element => super.element;
-
-  void valueChanged(value) {
-    element.checked = _toBoolean(value);
-  }
-
-  void updateBinding(e) {
-    binding.value = element.checked;
-
-    // Only the radio button that is getting checked gets an event. We
-    // therefore find all the associated radio buttons and update their
-    // CheckedBinding manually.
-    if (element is InputElement && element.type == 'radio') {
-      for (var r in _getAssociatedRadioButtons(element)) {
-        var checkedBinding = _mdv(r)._checkedBinding;
-        if (checkedBinding != null) {
-          // Set the value directly to avoid an infinite call stack.
-          checkedBinding.binding.value = false;
-        }
-      }
-    }
-  }
-
-  // |element| is assumed to be an HTMLInputElement with |type| == 'radio'.
-  // Returns an array containing all radio buttons other than |element| that
-  // have the same |name|, either in the form that |element| belongs to or,
-  // if no form, in the document tree to which |element| belongs.
-  //
-  // This implementation is based upon the HTML spec definition of a
-  // "radio button group":
-  //   http://www.whatwg.org/specs/web-apps/current-work/multipage/number-state.html#radio-button-group
-  //
-  static Iterable _getAssociatedRadioButtons(element) {
-    if (!_isNodeInDocument(element)) return [];
-    if (element.form != null) {
-      return element.form.nodes.where((el) {
-        return el != element &&
-            el is InputElement &&
-            el.type == 'radio' &&
-            el.name == element.name;
-      });
-    } else {
-      var radios = element.document.queryAll(
-          'input[type="radio"][name="${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);
-  }
-}