doneit-web/src/app/services/network-connection.service.ts

import { Injectable } from '@angular/core';
import { BehaviorSubject, Observable } from 'rxjs'
import { Platform } from '@ionic/angular'

@Injectable({
  providedIn: 'root'
})

export class NetworkConnectionService {
  online: boolean = true;

  constructor(){}

  checkOnline() {
    window.addEventListener('online', (on) => {
      this.online === true;
      console.log('Became online');
    });
  }

  checkOffline() {
    window.addEventListener('offline', (off) => {
      this.online === false;
      console.log('Became offline')
    });
  }

}