digest cycle angular

$rootScope.$safeApply = function($scope, fn) {
  fn = fn || function() {};
  if($scope.$$phase) {
    //don't worry, the value gets set and AngularJS picks up on it...
    fn();
  }
  else {
    //this will fire to tell angularjs to notice that a change has happened
    //if it is outside of it's own behaviour...
    $scope.$apply(fn); 
  }
};

//and you can run it like so.
$scope.some_value = 'value...';
$scope.$safeApply($scope, function() {
  //this function is run once the apply process is running or has just finished
});