AngularJS factory two-way data binding

Question

I have an angular controller with some related variables and a factory that creates an array (used to populate options in the select control):

// Controller MyController
angular.module('users').controller('MyController', ['$scope', 'Authentication', 'MyFactory', 
    function($scope, Authentication, MyFactory) {
        $scope.user = Authentication.user;
        $scope.options = MyFactory.getOptions($scope.user.firstName, $scope.user.lastName);
        ...
    }
    ...
}

// Factory MyFactory
angular.module('users').factory('MyFactory', 
    function() {
        var _this = this;
        _this._data = {
            getOptions: function(firstName, lastName){
                return [
                    firstName + ' ' + lastName,
                    lastName  + ' ' + firstName
                    ...
                ];  
            }
        };
        return _this._data;
    }
);

It works well the first time, but does not synchronize data between the controller and the factory.

The intended effect is that changing the argument MyFactory.getOptions()changes the resulting array assigned $scope.options.

Answer 1

, , , - . - $scope.$watch $scope.user, MyFactory.getOptions.

// Controller MyController
angular.module('users').controller('MyController', ['$scope', 'Authentication', 'MyFactory', 
    function($scope, Authentication, MyFactory) {
        $scope.user = Authentication.user;
        $scope.options = MyFactory.getOptions($scope.user.firstName, $scope.user.lastName);
        $scope.$watch("user", function(newVal,oldVal,scope) {
            scope.options = MyFactory.getOptions(newVal.firstName, newVal.lastName);
        });
        ...
    }
    ...
}

- . , .

---

- :

// Controller MyController
angular.module('users').controller('MyController', ['$scope', 'Authentication', 'MyFactory', 
    function($scope, Authentication, MyFactory) {
        $scope.user = Authentication.user;
        $scope.options = MyFactory.getOptions($scope, "user");
        ...
    }
    ...
}

// Factory MyFactory
angular.module('users').factory('MyFactory', 
    function() {
        var _this = this;
        _this._data = {
            getOptions: function(scope, property){
                var updateableArray = [];
                function updateArray(user) {
                    //delete all elements of updateableArray
                    updateableArray.clear();
                    //add all the new elements of updateableArray from user argument
                    updateableArray.push(firstName + ' ' + lastName);
                    updateableArray.push(lastName  + ' ' + firstName);
                    ....
                }
                scope.$watch(property, function(newVal,oldVal,watchScope) {
                    updateArray(newVal);
                });
                updateArray(scope[property]);
                return updateableArray;  
            }
        };
        return _this._data;
    }
);

, , , , , .