Angular: Empty Fiddle

http://angularjs.org/

HTML

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.6/angular.min.js"></script>
<div ng-controller="MyCtrl">
  <form name="test">
    Watching dirty: <input ng-model="name"  /><br />
    Ignoring dirty: <select ng-model="gender" ignore-dirty>
      <option>male</option>
      <option>female</option>
    </select><br />
    dirty: {{test.$dirty}}
  </form>
</div>

JavaScript

var myApp = angular.module('myApp',[]);

myApp.controller('MyCtrl', function ($scope) {
    $scope.name = 'Superhero';
});

myApp.directive('ignoreDirty', [function() {
    return {
    restrict: 'A',
    require: 'ngModel',
    link: function(scope, elm, attrs, ctrl) {
      ctrl.$setPristine = function() {};
      ctrl.$pristine = false;
    }
  }
}]);