Angular service is continuously throwing the error message "NullInjectorError: No provider for anotherService"

Question

Angular service is continuously throwing the error message "NullInjectorError: No provider for anotherService"

I recently built a basic Angular service and encountered an issue.

@Injectable()

export class someHandler {

    constructor(
        public anotherService: anotherService,
    ) {}
...

The problem arises when I try to use this service in a component, as it consistently throws an error stating

NullInjectorError: No provider for anotherService

. However, I am unable to include providers: [] within the service itself. Any suggestions on how to resolve this issue would be greatly appreciated. Thank you!

angular typescript service

Answer 1

Answer №1

It seems that anotherService is not included in the same module as someHandler, but without seeing the module.ts file it's hard to be sure.

If you have defined providers : ['someHandler'] in a module,

you will need to import the module that contains anotherService like this:

imports: [..., anotherServiceModule]

Answer 2

It seems that anotherService is not included in the same module as someHandler, but without seeing the module.ts file it's hard to be sure.

If you have defined providers : ['someHandler'] in a module,

you will need to import the module that contains anotherService like this:

imports: [..., anotherServiceModule]

Answer 3

Answer №2

To ensure that AnotherService is instantiated before SomeHandler in Angular, we need to specify it in the module setup like this:

@NgModule({
  declarations: [
    AppComponent,
    Component1Component
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule
  ],
  providers: [AnotherService],
  bootstrap: [AppComponent]
})
export class AppModule { }

By providing AnotherService at the module level, it becomes a shared instance accessible throughout the application as a singleton, already initialized.

Answer 4

To ensure that AnotherService is instantiated before SomeHandler in Angular, we need to specify it in the module setup like this:

@NgModule({
  declarations: [
    AppComponent,
    Component1Component
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule
  ],
  providers: [AnotherService],
  bootstrap: [AppComponent]
})
export class AppModule { }

By providing AnotherService at the module level, it becomes a shared instance accessible throughout the application as a singleton, already initialized.

Angular service is continuously throwing the error message "NullInjectorError: No provider for anotherService"

Answer №1

Answer №2

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