A guide on integrating a service into another service and utilizing it in exported constants or interfaces within Angular

My goal is to utilize a service within another service in order to translate strings found within exported constants.

This is how my code currently appears in a simplified form:

// Imports..

@Injectable(
  { providedIn: 'root' }
)
export class MyService {

  constructor(private httpClient: HttpClient, private injectedService: InjectedService) {
  }

  // Methods..
}

export enum Series {
  prop_1 = 'String_1',
  prop_2 = 'String_2',
  prop_3 = 'String_3',
}

export const ALL_SERIES: Series[] = [
  this.injectedService.translate(Series.prop_1),
  this.injectedService.translate(Series.prop_1),
  this.injectedService.translate(Series.prop_1),
];

However, I am encountering an error as the injected service is not recognized outside of the component:

ERROR Error: Uncaught (in promise): TypeError: Cannot read property 'injectedService' of undefined

I am seeking advice on the optimal solution to resolve this issue. What steps can be taken to address this problem effectively?

angulartypescriptdependency-injectiontypescript-typingsangular-components

Answer №1

A simple solution is to implement a getSeries function within the service that retrieves the constant values. This function will be enclosed within the MyService class, ensuring no errors occur.

@Injectable({
  providedIn: 'root'
})
export class MyService {

  constructor(private httpClient: HttpClient, private injectedService: InjectedService) {}

  // Additional methods..

  getSeries(): Series[] {
    return [
      this.injectedService.translate(Series.prop_1),
      this.injectedService.translate(Series.prop_2),
      this.injectedService.translate(Series.prop_3),
    ];
  }
}

export enum Series {
  prop_1 = 'String_1',
    prop_2 = 'String_2',
    prop_3 = 'String_3',
}

Instead of using ALL_SERIES, you will need to utilize the getSeries() method.

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