Please tell us about your environment: However, a simple experiment with a component using a service not annotated with Injectable works fine (see http://plnkr.co/edit/IJVf79C1D8bNVLg9Kh2f?p=preview for example). Asking for help, clarification, or responding to other answers. So the answer is no, you can't do it in a nice way. Tannakian-type reconstruction of etale fundamental group. Inject your class as a service and don't use static methods. Could you please check on this ive implemented but getting an error, Using a service without injection in angular2, https://angular.io/docs/ts/latest/api/http/index/Http-class.html, Design patterns for asynchronous API communication. Read more about our automatic conversation locking policy. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The CLI also adds Injectable to all the services it creates, and the tutorial explains that a service must have this annotation. The below AppService with dummy decorator and httpService can be injected in AppComponent without any problems. i.e, If we add the decorator, the metadata design:paramtypes is added, and the dependency injection can do it's job. Launch this plunkr: http://plnkr.co/edit/IJVf79C1D8bNVLg9Kh2f?p=preview. JavaScript front end for Odin Project book library database, Defining series before enumitem list starts. The third way is to take a standard Angular injector and try to play around it. Services are easy to create on your own. This is because meta information is generated with Injectable decorator. It should be fixed asap. To learn more, see our tips on writing great answers. [] js @Injectable({ providedIn: 'root', }) export class AppService { constructor(http: HttpService) { console.log(http); } }. This all might work but as a developer I would cry if I would need to support things like that. This is because there are no dependency services inside AppService. Inside your emailValidator use below code: Inside your component where you want to use ValidationService, inject ValidationService dependency and use below code whereever emailValidator is required. $(document).ready equivalent without jQuery. Another way. For example, Let's see the different variations of AppService in a root component. First of all, I don't believe this was ever working in RC5. Make the documentation match the actual behavior of angular, or vice-versa. Making statements based on opinion; back them up with references or personal experience. @jnizet you please open documentation issue at https://github.com/angular/angular.io ? Get selected value in dropdown list using JavaScript. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Service is injectable without Injectable decorator. @Injectable is needed if you want to inject things into a service. Trending is based off of the highest score sort and falls back to it if no posts are trending. A week ago I had a similar problem: passing a service instance to a simple class and passing it directly to the class constructor (first workaround) helped to achieve that. Minimal reproduction of the problem with instructions First of all, it is simple to pass a Http instance to your static function: where this.http is Http injected into the component. But the important thing here is any class that is going to be injected with Angular is decorated. privacy statement. If you want to use angular services (and Http is an angular service) you must inject them as I told above as a constructor attribute to another service / component, which means if you want to use Http you need to have your service injectable. Second, if you don't add your class to the injector (you don't pass it as a constructor attribute to another service / component) you should not call it service in angular, although it might be service in your understanding. In the end you are writing your own injector. What's the difference between a magic wand and a spell.

How can I use parentheses when there are math parentheses inside? Thanks for contributing an answer to Stack Overflow! Have a question about this project? No. Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, nice answer smnbbrv, ive decided to change the validator to be a service but its good to explore if there are other options which might come in handy later. Yes, there are cases when it might help (service in angular2 might have more than one instance), however I believe this is not your case. Why is the US residential model untouchable and unquestionable? This issue has been automatically locked due to inactivity. The second workaround is actually very much used for unit testing the services, so this is also helpful. How do I chop/slice/trim off last character in string using Javascript? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. The text was updated successfully, but these errors were encountered: Yes, the documentation should be fixed. Scroll to the top of the page using JavaScript? Documentation issue created: angular/angular.io#2546. What is the difference between "let" and "var"? If the service has no injection request in a constructor (does not inject anything) you could simply do. What happens if I accidentally ground the output of an LDO regulator? Why does hashing a password result in different hashes, each time? This action has been performed automatically by a bot.

NA.

Already on GitHub? That is the exact reason to add the @Injectable() decorator on a service if this service has some dependencies itself. There is a way by creating singleton static instance. I don't think it's a documentation issue necessarily, you could just as well argue that the decorator is poorly named and should be given a new name like provide. What is the motivation / use case for changing the behavior? How did this note help previous owner of this old film camera? you should not do things like that. I also hope it helps somebody because sometimes it is useful to know these things. Sign in Injector will throw NoAnnotationError when trying to instantiate a class that does not have @Injectable marker. In constructor we are assigning static instance variable to current instance. Please file a new issue if you are encountering a similar or related problem. Can a human colony be self-sustaining without sunlight using mushrooms? How do I modify the URL without reloading the page? and the generated javascript code of above service has meta information about HttpService, js var AppService = (function () { function AppService(http) { console.log(http); } AppService = __decorate([ core_1.Injectable(), __metadata('design:paramtypes', [http_service_1.HttpService]) ], AppService); return AppService; }()); exports.AppService = AppService; The below AppService with @injectable decorator and httpService can be injected in AppComponent without any problems. Happens on all environments. Or the documentation should be fixed to explain what Injectable really is for. Do weekend days count as part of a vacation? angular should throw an error when an injector is trying to create an instance of a service not decorated with Injectable. You can now choose to sort by Trending, which boosts votes that have happened recently, helping to surface more up-to-date answers. Now we can access instance inside static methods and use Http service dynamically. Skipping a calculus topic (squeeze theorem), Scientifically plausible way to sink a landmass.

How should I deal with coworkers not respecting my blocking off time in my calendar for work? This is because meta information is generated with dummy decorator. The below AppService can be injected in AppComponent without any problems.

Am new to angular2 and i have a class which has static functions in angular2 and i would like to implement a http request on one of the static functions that is, I have static classes that manage form validation, In my case above how can i use the http in the static function probably by assigning it to a variable, This is being used Here but it was in RC5 whic fails to me. rev2022.7.21.42639. You signed in with another tab or window. Connect and share knowledge within a single location that is structured and easy to search. ```js function SomeDummyDecorator() { return (constructor: Function) => console.log(constructor); }. http://plnkr.co/edit/IJVf79C1D8bNVLg9Kh2f?p=preview, The Injectable API documentation is incorrect.

Note that FooService is successfully created by the injector and injected into the app component, even though it doesn't have the Injectable decorator. Third, static methods on angular services make nearly no sense. Short story about the creation of a spell that creates a copy of a specific woman.

Is it patent infringement to produce patented goods but take no compensation? Well occasionally send you account related emails. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. The .css-uhw1xb{border-radius:var(--chakra-radii-sm);-webkit-padding-start:var(--chakra-space-1);padding-inline-start:var(--chakra-space-1);-webkit-padding-end:var(--chakra-space-1);padding-inline-end:var(--chakra-space-1);font-size:0.875em;padding-top:2px;padding-bottom:2px;white-space:nowrap;line-height:var(--chakra-lineHeights-normal);color:var(--chakra-colors-purple-500);}@Injectable() decorator is not strictly required if the class has other Angular decorators on it or does not have any dependencies. Announcing the Stacks Editor Beta release! How to encourage melee combat when ranged is a stronger option. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. to your account, I'm submitting a (check one with "x"), A marker metadata that marks a class as available to Injector for creation. It seems that the Injectable annotation is actually only needed if the service itself has dependencies that must be injected in its constructor, but that doesn't match with what the documentation says. Get selected text from a drop-down list (select box) using jQuery. How does one show this complex expression equals a natural number? Use the below code inside your ValidationService. Thnx! Find centralized, trusted content and collaborate around the technologies you use most. If a creature's best food source was 4,000 feet above it, and only rarely fell from that height, how would it evolve to eat that food? By clicking Sign up for GitHub, you agree to our terms of service and

The document may mislead us about the meaning of the @Injectable decorator.