Factory in Angular JS

Service.js

app.factory('Availability', ['$rootScope', '$http', function ($rootScope, $http) {
    return {
        Update: function () {
     
        }
    }
}]);

Controller.js

//calling Availability factory in controller

    var Controller = function ($scope, $location, $http, Availability) {

          Availability. Update();

   }

//calling factory from js

        var injectorAvailable = angular.element(document.querySelector('[ng-app]')).injector();

        var availabilityStatus = injectorAvailable.get('Availability ');

        Availability. Update();