Guide on implementing the Translate service pipe in Angular 2 code

So here's the issue... I've integrated an Angular 4 template into my application which includes a functioning translate service. The only problem is, I'm unsure of how to utilize that pipe in my code.

In HTML, it's as simple as adding

<span>{{ this.variable | traslate }}</span>
, and from there the service references JSON files to provide translations.

Below is the snippet of code from my component.ts file:

const SMALL_WIDTH_BREAKPOINT = 960;
@Component({
  selector: 'app-mycomponent',
  templateUrl: './mycomponent.component.html',
  styleUrls: ['./mycomponent.component.scss']
})

export class TrackingComponent implements OnInit { 
  currentLang = 'es';
  private mediaMatcher: MediaQueryList = matchMedia(`(max-width: 
  ${SMALL_WIDTH_BREAKPOINT}px)`);
  constructor(
    public translate: TranslateService,
    zone: NgZone,
    private router: Router,
  ) {
    const browserLang: string = translate.getBrowserLang();
      translate.use(browserLang.match(/en|es/) ? browserLang : 'es');
      this.mediaMatcher.addListener(mql => zone.run(() => {
        this.mediaMatcher = mql;
      }));
      translate.use(this.currentLang);
  }

  ngOnInit() { }

  myFunction(msg: string) : {
    const translatedText = msg; // THIS IS WHERE I'M STRUGGLING TO INCORPORATE THE TRANSLATE SERVICE EFFECTIVELY
    alert(translatedText );
  }

}

I ensured all necessary components are included in the module since it functions properly in HTML, but implementing it within the code remains a challenge.

In my quest for a solution, I came across the following approach:

 let translatedText = new TranslatePipe().transform(msg);

 however, the `TranslatePipe` seems to be ineffective.

Can anyone offer guidance on how to successfully call the translation service?

Answer №1

There are essentially 3 options

If you are certain that your translation files are already loaded and do not want the translations to be updated automatically if a language changes, use

translate.instant('ID')

If you are unsure about the loading status but do not require updates on language changes, use translate.get('ID'). It provides an observable that delivers the translation once it is loaded and ends the observable.

If you desire continuous updates (e.g. when a language changes), utilize translate.stream('ID') - it offers an observable that emits translation updates. Remember to dispose of the observable if it is no longer needed.

This presupposes that TranslationService has been injected as translate in your component.

For example:

export class AppComponent {
    constructor(translate: TranslateService) {
        translate.get('hello.world').subscribe((text:string) => {console.log(text});
    }
}

You will need to assign the translation to your data array within the subscribe function.

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