I would like to maintain a log that is available to several modules in my Angular 8 system. So I created the following service:

@Injectable({
	providedIn: 'root'
})
export class LogService {
	_log: string[] = [];
	
	constructor() {	}
	
	log(labelMsg: string, msg?: string | object) {
		if (msg && typeof msg != 'string')
			msg = JSON.stringify(msg);
		
		msg = msg ? `${labelMsg}: ${msg}` : labelMsg;
		this._log.push(`[${moment().format("DD/MM/YYYY HH:mm:ss.SSS")}] - ${msg}`);
	}
	
	show() {
		if (this._log.length)
			this._log.forEach(l=>console.log(l));
		else 
			console.log('Empty log');
		
	}
}

But the problem is that when I load I inject it on several components, I get a per-component instance. I mean I log things in app-init, MainComponent and AboutComponent. And each time I change components, .show will output "Empty log". I don't want to persist this data. I want it to live only in the frontend.

How can I retain the data between components ?

Edit

Code of component where I used LogService:

(...)
import { LogService } from 'src/app/shared/services/log.service';
(...)

@Component({
	selector: 'app-show-account',
	templateUrl: './show-account.component.html',
	styleUrls: ['./show-account.component.scss']
})
export class ShowAccountComponent implements OnInit {
        (...)
	constructor(
                (... other services)
		private logService: LogService
	) { }

	ngOnInit() {
                (...)
		this.logService.log('Show account');
	        (...)
        }
        (...)
}

posted over 3 years ago

CC BY-SA 4.0

3y ago

nelson777‭

165 reputation 6 6 12 12