Can Angular 2+ or JavaScript help detect ERR_INTERNET_DISCONNECTED to notify the user effectively?
Can Angular 2+ or JavaScript help detect ERR_INTERNET_DISCONNECTED to notify the user effectively?
When it comes to determining whether a browser is working online, the Navigator interface on the global window object holds the key.
The simple solution lies in checking navigator.onLine, which returns a Boolean value indicating the online status of the browser. For more details, refer to the DOM documentation.
To implement this feature, consider using the following code snippet:
if(navigator.onLine) { // true|false
// ...
}
Besides checking the property value, you can also listen for offline and online events:
window.addEventListener('online', (e) => console.log(e, "you're online"));
window.addEventListener('offline', (e) => console.log(e, "you're offline"));
By utilizing these events, you can tailor your UI based on the user's online status, providing a seamless experience even when offline. This could involve freezing the UI, displaying relevant messages, or enabling offline data storage solutions like localStorage until connectivity is restored.
My preferred approach involves the following method:
Begin by defining in your class
online$: Observable<boolean>then within the constructor
this.online$ = Observable.merge(
Observable.of(navigator.onLine),
Observable.fromEvent(window, 'online').mapTo(true),
Observable.fromEvent(window, 'offline').mapTo(false)
)
Also, make sure to include the necessary imports
import { Observable } from 'rxjs/Observable';
import 'rxjs/Rx';
To use it in the template, simply add:
<p *ngIf="(online$ | async) == false" >
<ngb-alert [dismissible]="false">
<strong>Warning!</strong> Better check yourself, you're not connected to the internet.
</ngb-alert>
</p>
You also have the option to utilize it as a service.
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