What steps can be taken to prolong the duration of a service?

Question

What steps can be taken to prolong the duration of a service?

As a newcomer to angularjs, I am struggling to find documentation or examples on how to extend a basic service in order to utilize its methods from other services. For example, consider the following basic service:

angular.module('myServices', []).

    factory('BasicService', function($http){
        var some_arg = 'abcd'
        var BasicService = {
            method_one: function(arg=some_arg){ /*code for method one*/},
            method_two: function(arg=some_arg){ /*code for method two*/},
            method_three: function(arg=some_arg){ /*code for method three*/},
        });
        return BasicService;
    }   
);

Now, I want to create an Extended service that extends the functionality of the above BasicService so I can access its methods within my extended service. Perhaps something like this:

factory('ExtendedService', function($http){
    var ExtendedService = BasicService();
    ExtendedService['method_four'] = function(){/* code for method four */}
    return ExtendedService;
}

javascript angularjs

Answer 1

Answer №1

A more streamlined and clear approach

.factory('ExtendedService', function($http, BasicService){

    var extended = angular.extend(BasicService, {})
    extended.method = function() {
        // ...
    }
    return extended;
}

Answer 2

A more streamlined and clear approach

.factory('ExtendedService', function($http, BasicService){

    var extended = angular.extend(BasicService, {})
    extended.method = function() {
        // ...
    }
    return extended;
}

Answer 3

Answer №2

It is important for your ExtendedService to have the BasicService injected in order to access it. Remember, the BasicService is an object literal, so you cannot call it as a function like this: BasicService().

.factory('ExtendedService', function($http, BasicService){
  BasicService['method_four'] = function(){};
  return BasicService;
}

Answer 4

It is important for your ExtendedService to have the BasicService injected in order to access it. Remember, the BasicService is an object literal, so you cannot call it as a function like this: BasicService().

.factory('ExtendedService', function($http, BasicService){
  BasicService['method_four'] = function(){};
  return BasicService;
}

Answer 5

Answer №3

In my humble opinion, a more effective approach:

.factory('ExtendedService', function($http, BasicService){
    var newService = angular.copy(BasicService);

    newService.methodFour = function(){
        //code for method four
    };

    return newService;
});

By following this method, the original service remains unchanged.

Answer 6

In my humble opinion, a more effective approach:

.factory('ExtendedService', function($http, BasicService){
    var newService = angular.copy(BasicService);

    newService.methodFour = function(){
        //code for method four
    };

    return newService;
});

By following this method, the original service remains unchanged.

Answer 7

Answer №4

Apologies for posting here, but I believe this is a suitable place to do so. I would like to reference this post

Be cautious when extending a service/factory as they are singletons, meaning you can only extend them once.

'use strict';
            angular.module('animal', [])
                .factory('Animal',function(){
                        return {
                            vocalization:'',
                            vocalize : function () {
                                console.log('vocalize: ' + this.vocalization);
                            }
                        }

                });
                angular.module('dog', ['animal'])
                    .factory('Dog', function (Animal) {
                        Animal.vocalization = 'bark bark!';
                        Animal.color = 'red';
                        return Animal;
                    });

                angular.module('cat', ['animal'])
                   .factory('Cat', function (Animal) {
                        Animal.vocalization = 'meowwww';
                        Animal.color = 'white';
                        return Animal;
                    });
                 angular.module('app', ['dog','cat'])
                .controller('MainCtrl',function($scope,Cat,Dog){
                     $scope.cat = Cat;
                     $scope.dog = Dog;
                     console.log($scope.cat);
                     console.log($scope.dog);
                    //$scope.cat = Cat;
                });

However, if you follow this approach:

'use strict';
            angular.module('animal', [])
                .factory('Animal',function(){
                    return function(vocalization){
                        return {
                            vocalization:vocalization,
                            vocalize : function () {
                                console.log('vocalize: ' + this.vocalization);
                            }
                        }
                    }
                });    
                angular.module('app', ['animal'])
                    .factory('Dog', function (Animal) {
                        function ngDog(){
                            this.prop = 'my prop 1';
                            this.myMethod = function(){
                                console.log('test 1');
                            }
                        }
                        return angular.extend(Animal('bark bark!'), new ngDog());
                    })
                    .factory('Cat', function (Animal) {
                        function ngCat(){
                            this.prop = 'my prop 2';
                            this.myMethod = function(){
                                console.log('test 2');
                            }
                        }
                        return angular.extend(Animal('meooow'), new ngCat());
                    })
                .controller('MainCtrl',function($scope,Cat,Dog){
                     $scope.cat = Cat;
                     $scope.dog = Dog;
                     console.log($scope.cat);
                     console.log($scope.dog);
                    //$scope.cat = Cat;
                });

It will work as expected.

Answer 8

Apologies for posting here, but I believe this is a suitable place to do so. I would like to reference this post

Be cautious when extending a service/factory as they are singletons, meaning you can only extend them once.

'use strict';
            angular.module('animal', [])
                .factory('Animal',function(){
                        return {
                            vocalization:'',
                            vocalize : function () {
                                console.log('vocalize: ' + this.vocalization);
                            }
                        }

                });
                angular.module('dog', ['animal'])
                    .factory('Dog', function (Animal) {
                        Animal.vocalization = 'bark bark!';
                        Animal.color = 'red';
                        return Animal;
                    });

                angular.module('cat', ['animal'])
                   .factory('Cat', function (Animal) {
                        Animal.vocalization = 'meowwww';
                        Animal.color = 'white';
                        return Animal;
                    });
                 angular.module('app', ['dog','cat'])
                .controller('MainCtrl',function($scope,Cat,Dog){
                     $scope.cat = Cat;
                     $scope.dog = Dog;
                     console.log($scope.cat);
                     console.log($scope.dog);
                    //$scope.cat = Cat;
                });

However, if you follow this approach:

'use strict';
            angular.module('animal', [])
                .factory('Animal',function(){
                    return function(vocalization){
                        return {
                            vocalization:vocalization,
                            vocalize : function () {
                                console.log('vocalize: ' + this.vocalization);
                            }
                        }
                    }
                });    
                angular.module('app', ['animal'])
                    .factory('Dog', function (Animal) {
                        function ngDog(){
                            this.prop = 'my prop 1';
                            this.myMethod = function(){
                                console.log('test 1');
                            }
                        }
                        return angular.extend(Animal('bark bark!'), new ngDog());
                    })
                    .factory('Cat', function (Animal) {
                        function ngCat(){
                            this.prop = 'my prop 2';
                            this.myMethod = function(){
                                console.log('test 2');
                            }
                        }
                        return angular.extend(Animal('meooow'), new ngCat());
                    })
                .controller('MainCtrl',function($scope,Cat,Dog){
                     $scope.cat = Cat;
                     $scope.dog = Dog;
                     console.log($scope.cat);
                     console.log($scope.dog);
                    //$scope.cat = Cat;
                });

It will work as expected.

Answer 9

Answer №5

I created a custom $extend provider that leverages Backbone's extend functionality -- This allows for extending both prototype and static properties as needed -- Additionally, it includes parent/child constructors for added flexibility -- For more information, please refer to the gist @ https://gist.github.com/asafebgi/5fabc708356ea4271f51

Answer 10

I created a custom $extend provider that leverages Backbone's extend functionality -- This allows for extending both prototype and static properties as needed -- Additionally, it includes parent/child constructors for added flexibility -- For more information, please refer to the gist @ https://gist.github.com/asafebgi/5fabc708356ea4271f51

Answer 11

Answer №6

In addition to what Stewie mentioned, another option is to implement the following approach:

.factory('ExtendedService', function($http, BasicService){
    var service = {
        method_one: BasicService.method_one,
        method_two: BasicService.method_two,
        method_three: BasicService.method_three,
        method_four: custom_method
    });

    return service ;

    function custom_method(){

    }
}

One advantage of this is that the original service remains unchanged, preserving its functionality. Moreover, you have the flexibility to provide your own implementations for the other three methods in ExtendedService based on BasicService.

Answer 12

In addition to what Stewie mentioned, another option is to implement the following approach:

.factory('ExtendedService', function($http, BasicService){
    var service = {
        method_one: BasicService.method_one,
        method_two: BasicService.method_two,
        method_three: BasicService.method_three,
        method_four: custom_method
    });

    return service ;

    function custom_method(){

    }
}

One advantage of this is that the original service remains unchanged, preserving its functionality. Moreover, you have the flexibility to provide your own implementations for the other three methods in ExtendedService based on BasicService.

What steps can be taken to prolong the duration of a service?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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