Is it necessary to re-import ElementRef in a service if it has already been imported in the app module?
Alternatively, is it possible to import all elements from angular/core in the app.module and have them accessible to all directives, pipes, and services imported within the app.module?
Ensure to bring them in when they are required.
In the AppModule, you will have to import them for inclusion in providers, declarations, imports, and so on.
Similarly, within your components, directives, pipes, modules, services, etc., you must import them again if you wish to utilize them.
For instance:
AppModule
import { HttpModule } from '@angular/http';
@NgModule({
bootstrap: [AppComponent],
declarations: [
AppComponent
],
imports: [
BrowserModule,
FormsModule,
HttpModule
]
})
export class AppModule {
constructor() {
}
}
UserModule
If I need to make HTTP requests in UserModule, then I will need to import the Http module...
import { HttpModule } from '@angular/http';
@NgModule({
imports: [
HttpModule
],
declarations: [],
exports: [
HttpModule
]
})
export class UserModule{
}
Imported items are only visible and usable within the class where they are imported.
Do I need to import ElementRef again in a service?
Yes, you must import it in the service class as it cannot access imports from the app.module.
Is it possible to import all necessary elements from angular/core in app.module and make them accessible to directives, pipes, and services that are also imported in app.module?No, this is not possible because only the app.module has access to its own imports.
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