From c75202d5d7ecabd01366f2198e0c0c3b5c087e59 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matias=20Niemel=C3=A4?= <matias@yearofmoo.com>
Date: Wed, 12 Feb 2014 11:32:06 -0500
Subject: [PATCH] feat(forms): provide support for reseting forms, fieldsets
 and models

---
 lib/directive/ng_control.dart     |  5 +++++
 lib/directive/ng_model.dart       | 10 ++++++++++
 test/directive/ng_form_spec.dart  | 31 +++++++++++++++++++++++++++++++
 test/directive/ng_model_spec.dart | 26 ++++++++++++++++++++++++++
 4 files changed, 72 insertions(+)

diff --git a/lib/directive/ng_control.dart b/lib/directive/ng_control.dart
index a9042c75d..1d787b5f9 100644
--- a/lib/directive/ng_control.dart
+++ b/lib/directive/ng_control.dart
@@ -32,6 +32,10 @@ abstract class NgControl implements NgDetachAware {
     }
   }
 
+  reset() {
+    _scope.$broadcast('resetNgModel');
+  }
+
   get name => _name;
   set name(value) {
     _name = value;
@@ -168,5 +172,6 @@ class NgNullControl implements NgControl {
   get invalid => null;
   set invalid(value) {}
 
+  reset() => null;
   detach() => null;
 }
diff --git a/lib/directive/ng_model.dart b/lib/directive/ng_model.dart
index 892ae973f..b6a7b67b7 100644
--- a/lib/directive/ng_model.dart
+++ b/lib/directive/ng_model.dart
@@ -15,6 +15,7 @@ class NgModel extends NgControl {
   BoundGetter getter = ([_]) => null;
   BoundSetter setter = (_, [__]) => null;
 
+  var _lastValue; 
   String _exp;
   final _validators = <NgValidatable>[];
 
@@ -26,6 +27,11 @@ class NgModel extends NgControl {
     super(scope, element, injector) {
     _exp = 'ng-model=${attrs["ng-model"]}';
     watchCollection = false;
+    scope.$on('resetNgModel', reset);
+  }
+
+  reset() {
+    modelValue = _lastValue;
   }
 
   @NgAttr('name')
@@ -51,6 +57,10 @@ class NgModel extends NgControl {
   set model(BoundExpression boundExpression) {
     getter = boundExpression;
     setter = boundExpression.assign;
+
+    _scope.$evalAsync((value) {
+      _lastValue = modelValue;
+    });
   }
 
   // TODO(misko): right now viewValue and modelValue are the same,
diff --git a/test/directive/ng_form_spec.dart b/test/directive/ng_form_spec.dart
index f48ee64f2..6b3da4ab4 100644
--- a/test/directive/ng_form_spec.dart
+++ b/test/directive/ng_form_spec.dart
@@ -306,6 +306,37 @@ describe('form', () {
     }));
   });
 
+  describe('reset()', () {
+    it('should reset the model value to its original state', inject((TestBed _) {
+      _.compile('<form name="superForm">' + 
+                ' <input type="text" ng-model="myModel" probe="i" />' +
+                '</form>');
+      _.rootScope.$apply('myModel = "animal"');
+
+      NgForm form = _.rootScope['superForm'];
+
+      Probe probe = _.rootScope.i;
+      var model = probe.directive(NgModel);
+
+      expect(_.rootScope.myModel).toEqual('animal');
+      expect(model.modelValue).toEqual('animal');
+      expect(model.viewValue).toEqual('animal');
+
+      _.rootScope.$apply('myModel = "man"');
+
+      expect(_.rootScope.myModel).toEqual('man');
+      expect(model.modelValue).toEqual('man');
+      expect(model.viewValue).toEqual('man');
+
+      form.reset();
+      _.rootScope.$apply();
+
+      expect(_.rootScope.myModel).toEqual('animal');
+      expect(model.modelValue).toEqual('animal');
+      expect(model.viewValue).toEqual('animal');
+    }));
+  });
+
   describe('regression tests: form', () {
     it('should be resolvable by injector if configured by user.', () {
       module((Module module) {
diff --git a/test/directive/ng_model_spec.dart b/test/directive/ng_model_spec.dart
index 8445713a2..2c9fef456 100644
--- a/test/directive/ng_model_spec.dart
+++ b/test/directive/ng_model_spec.dart
@@ -772,6 +772,32 @@ describe('ng-model', () {
 
     });
   });
+
+  describe('reset()', () {
+    it('should reset the model value to its original state', () {
+      _.compile('<input type="text" ng-model="myModel" probe="i" />');
+      _.rootScope.$apply('myModel = "animal"');
+
+      Probe probe = _.rootScope.i;
+      var model = probe.directive(NgModel);
+
+      expect(_.rootScope.myModel).toEqual('animal');
+      expect(model.modelValue).toEqual('animal');
+      expect(model.viewValue).toEqual('animal');
+
+      _.rootScope.$apply('myModel = "man"');
+
+      expect(_.rootScope.myModel).toEqual('man');
+      expect(model.modelValue).toEqual('man');
+      expect(model.viewValue).toEqual('man');
+
+      model.reset();
+
+      expect(_.rootScope.myModel).toEqual('animal');
+      expect(model.modelValue).toEqual('animal');
+      expect(model.viewValue).toEqual('animal');
+    });
+  });
 });
 
 @NgController(