Is it possible to retrieve any @Injectable like:
var config = @Inject(Config);
Thanks
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2 Answers
If you want to get new instances from dependency injection, you need a reference to the Injector then you can acquire new instances with
injector.get(Config);
How you can get a reference to Injector depends on where your code is.
In an Angular component or service, just inject it
constructor(private injector:Injector) {}
You can also just create your own injector like
var injector = Injector.resolveAndCreate([Car, Engine]);
where Car and Engine are the providers the injector can create instances for.
To get the injector of your Angular application to be used outside your Angular application you can use
Example from https://github.com/angular/angular/issues/4112#issuecomment-153811572
let appInjectorRef: Injector;
export const appInjector = (injector?: Injector):Injector => {
if (injector) {
appInjectorRef = injector;
}
return appInjectorRef;
};
bootstrap(App, [
Auth,
HTTP_PROVIDERS,
ROUTER_PROVIDERS,
Car,
Engine
]).then((appRef: ComponentRef) => {
// store a reference to the application injector
appInjector(appRef.injector);
});
let injector: Injector = appInjector();
injector.get(Car);
answered Apr 7, 2016 at 4:24
Günter Zöchbauer
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Comments
I found it easier to declare injector as a global variable so I could use it a bit easier.
In the file where you bootstrap angular:
declare global {
var injector: Injector;
}
bootstrap(/* your bootstrap stuff */).then((appRef) => {
injector = appRef.injector;
});
The above will give you access to an injector variable anywhere else in your code.
In the file where you need an instance of Config:
import { Config } from './path/to/config.service';
class TestClass {
private config: Config;
constructor() {
this.config = injector.get(Config);
}
}
