Issue
I have a service in my Angular application that requires two dependencies in its constructor: UntypedFormGroup and DestroyRef. Currently, I am injecting these dependencies directly into the service's constructor in my module.
Now, I want to find a way to provide these dependencies to the service from a component without injecting them into the component's constructor.
Here's my simplified service:
@Injectable()
export class CalculateFieldsService {
constructor(
private jsonForm: UntypedFormGroup,
private destroy: DestroyRef
) {
// Service constructor
}
// Rest of the service code...
}
How I can pass those two parameters. From providers or how I can?
I appreciate any guidance or examples on how to achieve this effectively. Thank you for your assistance!
Solution
You can use Angular's Dependency Injection system. You can try using a factory function to provide the service.
@Injectable()
export class CalculateFieldsService {
constructor(
private jsonForm: UntypedFormGroup,
private destroy: DestroyRef
) {
// Service constructor
}
// Rest of the service code...
}
export function CalculateFieldsServiceFactory(jsonForm: UntypedFormGroup, destroy: DestroyRef) {
return new CalculateFieldsService(jsonForm, destroy);
}
In your component, you can configure the providers in the component decorator to provide the dependencies and the service using the factory function.
import { Component, Injectable, Inject } from '@angular/core';
@Component({
selector: 'app-your-component',
templateUrl: './your-component.component.html',
providers: [
{
provide: CalculateFieldsService,
useFactory: CalculateFieldsServiceFactory,
deps: [UntypedFormGroup, DestroyRef]
}
]
})
export class YourComponent {
constructor(private calculateFieldsService: CalculateFieldsService) {
// You can now use the service with the provided dependencies.
}
}
Answered By - Ale_Bianco
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