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+@workInProgress
+@ngdoc overview
+@name Cookbook: Advanced Form
+@description
+
+Here we extend the basic form example to include common features such as reverting, dirty state
+detection, and preventing invalid form submission.
+
+<doc:example>
+ <doc:source>
+    <script>
+    UserForm.$inject = ['$invalidWidgets'];
+    function UserForm($invalidWidgets){
+      this.$invalidWidgets = $invalidWidgets;
+      this.state = /^\w\w$/;
+      this.zip = /^\d\d\d\d\d$/;
+      this.master = {
+        name: 'John Smith',
+        address:{
+          line1: '123 Main St.',
+          city:'Anytown',
+          state:'AA',
+          zip:'12345'
+        },
+        contacts:[
+          {type:'phone', value:'1(234) 555-1212'}
+        ]
+      };
+      this.cancel();
+    }
+
+    UserForm.prototype = {
+      cancel: function(){
+        this.form = angular.copy(this.master);
+      },
+
+      save: function(){
+        this.master = this.form;
+        this.cancel();
+      }
+    };
+    </script>
+    <div ng:controller="UserForm">
+
+      <label>Name:</label><br/>
+      <input type="text" name="form.name" ng:required/> <br/><br/>
+
+      <label>Address:</label><br/>
+      <input type="text" name="form.address.line1" size="33" ng:required/> <br/>
+      <input type="text" name="form.address.city" size="12" ng:required/>,
+      <input type="text" name="form.address.state" size="2" ng:required ng:validate="regexp:state"/>
+      <input type="text" name="form.address.zip" size="5" ng:required ng:validate="regexp:zip"/><br/><br/>
+
+      <label>Phone:</label>
+      [ <a href="" ng:click="form.contacts.$add()">add</a> ]
+      <div ng:repeat="contact in form.contacts">
+        <select name="contact.type">
+          <option>email</option>
+          <option>phone</option>
+          <option>pager</option>
+          <option>IM</option>
+        </select>
+        <input type="text" name="contact.value" ng:required/>
+         [ <a href="" ng:click="form.contacts.$remove(contact)">X</a> ]
+      </div>
+    <button ng:click="cancel()" disabled="{{master.$equals(form)}}">Cancel</button>
+    <button ng:click="save()" disabled="{{$invalidWidgets.visible() || master.$equals(form)}}">Save</button>
+
+    <hr/>
+    Debug View:
+    <pre>form={{form}}
+    master={{master}}</pre>
+    </div>
+ </doc:source>
+ <doc:scenario>
+  it('should enable save button', function(){
+    expect(element(':button:contains(Save)').attr('disabled')).toBeTruthy();
+    input('form.name').enter('');
+    expect(element(':button:contains(Save)').attr('disabled')).toBeTruthy();
+    input('form.name').enter('change');
+    expect(element(':button:contains(Save)').attr('disabled')).toBeFalsy();
+    element(':button:contains(Save)').click();
+    expect(element(':button:contains(Save)').attr('disabled')).toBeTruthy();
+  });
+  it('should enable cancel button', function(){
+    expect(element(':button:contains(Cancel)').attr('disabled')).toBeTruthy();
+    input('form.name').enter('change');
+    expect(element(':button:contains(Cancel)').attr('disabled')).toBeFalsy();
+    element(':button:contains(Cancel)').click();
+    expect(element(':button:contains(Cancel)').attr('disabled')).toBeTruthy();
+    expect(element(':input[name=form.name]').val()).toEqual('John Smith');
+  });
+ </doc:scenario>
+</doc:example>
+
+
+#Things to notice
+
+* Cancel & save buttons are only enabled if the form is dirty -- there is something to cancel or
+  save.
+* Save button is only enabled if there are no validation errors on the form.
+* Cancel reverts the form changes back to original state.
+* Save updates the internal model of the form.
+* Debug view shows the two models. One presented to the user form and the other being the pristine
+  copy master.