We might all be familiar with the JavaScript way of checking Online/Offline status. But in the case of Angular, we need to properly unsubscribe the events we are listening to. Otherwise, it might lead to unnecessary behaviors and memory leaks. Plain JS window.addEventListener("load", () => {
  this.networkStatus = navigator.onLine

  window.addEventListener("online", () => {
    this.networkStatus = true
  });

  window.addEventListener("offline", () => {
    this.networkStatus = false
  });
}); Angular Way import { Component, OnDestroy, OnInit, VERSION } from '@angular/core';

import { fromEvent, merge, of, Subscription } from 'rxjs';
import { map } from 'rxjs/operators';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit, OnDestroy {
  networkStatus: boolean = false;
  networkStatus$: Subscription = Subscription.EMPTY;

  constructor() {}

  ngOnInit(): void {
    this.checkNetworkStatus();
  }

  ngOnDestroy(): void {
    this.networkStatus$.unsubscribe();
  }

  checkNetworkStatus() {
    this.networkStatus = navigator.onLine;
    this.networkStatus$ = merge(
      of(null),
      fromEvent(window, 'online'),
      fromEvent(window, 'offline')
    )
      .pipe(map(() => navigator.onLine))
      .subscribe(status => {
        console.log('status', status);
        this.networkStatus = status;
      });
  }
} You can see the demo . here or check the code here Happy coding!!! 🎉🎉🎉 Also published here.

How to Compile Angular Component To HTML String With All The Bindings

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