Angularjs - $rootScope in directive link function

Question

I am asking this question because I am not quite clear on how to think of rootscope as a dependency passed to directives

I have a directive that needs to display some in

Answer 1

Sometimes I have to use $scope.$root:

app.directive('setOrdinal', function() {
  return {
    link: function($scope, $element, $attr) {

      var steps = $scope.$root.steps;

      $scope.$watch(setOrdinal, function(value) {
        if (value)
        {
          // steps code here
        }
      });
    }
  };
});

app.controller('stepController', ['$scope', '$rootScope', 'GetSteps', function ($scope, $rootScope, GetSteps) {
  var s = $scope;
  var r = $rootScope;

  s.initialize = function(id)
  {
    GetSteps.get({id: id}, function(resp){
      r.steps = resp.steps;
    });
  };
}]);