Hello I am creating a injectable service and passing data from the parent component to the injectable service via @Inject & (specifying the useValue within the parent's providers), this works but I want to be able to pass the components class variables. Would this be possible?
#Dependency Injection
tardy rapids
sly lotus
It's better if you post some code.
stuck plume
g!codeblock @tardy rapids
glad irisBOT
@tardy rapids, you can use the following snippet to have your code formatted and colored by Discord. Replace ts with the language you need (i.e. html, js, css, etc)
```ts
// your code goes here
```
tardy rapids
within parent component providers: [ { provide: 'data', useValue: 123, }, CustomService ] constructor of parent: readonly data: CustomService, CustomService: ```@Injectable({providedIn: 'root'})
export class CustomService {
constructor(@Inject('data') private data: number) {
this.data = data;
}
}``` 123 is stored within is a class variable within the parent.. but i cant reference it
stuck plume
Don't provide: a string ('data'). Use an InjectionToken
And generally you use:
@Injectable({ providedIn: 'root' }) // Always 'root' unless you _know_ better!
export class CustomService {}
Then you don't need to put CustomService in providers: [list]
And I have no idea why you want to inject 'data' anyway...
sly lotus
So, you want to inject in a component, a service constructed with a parameter passed by the component itself?
sly lotus
The injected component or service?
tardy rapids
the injected component is the service (CustomService)
sly lotus
If it's a service it's not a component.
tardy rapids
injected service, my bad
sly lotus
I doubt it's possible, considering that injecting a dependency in a component suppose that deps to be already instantiated.
Why do you want to pass that value in constructor?
Sound like a design issue here.
tardy rapids
the service needs to grab default values, (which are initialized in the parent component)
sly lotus
Instead of using these values in service's constructor, send them to it through a method from the component and, if as I think they have to be consumed by other components, expose them through a Subject.