Strategies for importing a page property into a data service using Angular

Can someone guide me on importing the trackingId from tracking.page.ts to geolocation.service.ts in my Ionic App using Angular and TypeScript?

Take a look at a snippet of the code below.

tracking.page.ts

import { Component, OnInit, ViewChild, ElementRef } from '@angular/core';
import { Geolocation } from '@ionic-native/geolocation/ngx';
import { GeolocationService } from '../../app/geolocation.service';
import { UserService } from '../../app/user.service';
import { Insomnia } from '@ionic-native/insomnia/ngx';
import { LoadingController } from '@ionic/angular';
import { AlertController } from '@ionic/angular';
import { AppComponent } from '../app.component';
import { Storage } from '@ionic/storage';

declare var google;

@Component({
  selector: 'app-tracking',
  templateUrl: './tracking.page.html',
  styleUrls: ['./tracking.page.scss'],
})
export class TrackingPage implements OnInit {
  @ViewChild('map', { static: true }) mapElement: ElementRef;
  map: any;
  markers = [];
  geoLocations: any;

  watchLocationUpdates: any;
  isWatching: boolean;
  interval: any;

  geoLatitude: number;
  geoLongitude: number;
  geoAccuracy: number;
  timeStamp: any;
  uId: string;
  trackingId: string; // This is the trackingId
...

geolocation.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { environment } from '../environments/environment';

@Injectable({
  providedIn: 'root'
})

export class GeolocationService {

  databaseUrl = environment.firebase.databaseURL;

  constructor(private http: HttpClient) {

    console.log('Hello GeolocationService Provider');
    console.log('GeolocationService: ', this.databaseUrl);

  }
...

Answer №1

One effective approach is to create a dedicated service for storing the trackingid and then seamlessly inject it into the subsequent page.

Attempting to handle this process without utilizing services may lead to complications with Zoning and change detection mechanisms.

Answer №2

Describe the trackingid variable within the service file using an observable subject as shown below:

 public trackingid: BehaviorSubject<number> = new BehaviorSubject(1);

You can then set and retrieve the value of trackingid within the service like this:

 public getTrackingId(): boolean {
        return this.trackingid.value;
    }

 public setTrackingId(){
        return this.trackingid.next(2);
    }

Now, you can access and update the trackingId from a component.

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