Reconnecting a websocket in Angular and rxjs?

Actually there now is a WebsocketSubject in rxjs!

 import { webSocket } from 'rxjs/webSocket' // for RxJS 6, for v5 use Observable.webSocket let subject = webSocket('ws://localhost:8081'); subject.subscribe(    (msg) => console.log('message received: ' + msg),    (err) => console.log(err),    () => console.log('complete')  ); subject.next(JSON.stringify({ op: 'hello' }));

It does handle reconnection when you resubscribe to a broken connection. So for example write this to reconnect:

subject.retry().subscribe(...)

See the docs for more info. Unfortunately the searchbox doesn't show the method, but you find it here:

http://reactivex.io/rxjs/class/es6/Observable.js~Observable.html#static-method-webSocket

that #-navigation is not working in my browser, so search for "webSocket" on that page.

Source: http://reactivex.io/rxjs/file/es6/observable/dom/WebSocketSubject.js.html#lineNumber15

This might not be the good answer but it's way too much for a comment.

The problem might comes from your service :

listenToTheSocket(): Observable<any> {  this.websocket = new WebSocket(this.destination);  this.websocket.onopen = () => {    console.log("WebService Connected to " + this.destination);  }  return Observable.create(observer => {    this.websocket.onmessage = (evt) => {      observer.next(evt);    };  })  .map(res => res.data)  .share();}

Do you think that you go multiple times in your component into the ngOnInit method?
You should try to put a console.log into ngOnInit to be sure.

Because if you do so, in your service you'll override the this.websocket with a new one.

You should try something like that instead :

@Injectable()export class MemberService implements OnInit {  private websocket: any;  private websocketSubject$ = new BehaviorSubject<any>();  private websocket$ = this.websocketSubject$.asObservable();  private destination = 'wss://notessensei.mybluemix.net/ws/time';  constructor() { }  ngOnInit() { }  listenToTheSocket(): Observable<any> {    if (this.websocket) {      return this.websocket$;    }    this.websocket = new WebSocket(this.destination);    this.websocket.onopen = () => console.log(`WebService Connected to ${this.destination}`);    this.websocket.onmessage = (res) => this.websocketSubject$.next(res => res.data);  }}

The BehaviorSubject will send the last value if it receives an event before you subscribe to it. Plus, as it's a subject, no need to use the share operator.

For rxjs 6 implementation

import { webSocket } from 'rxjs/webSocket'let subject = webSocket('ws://localhost:8081');subject.pipe(   retry() //support auto reconnect).subscribe(...)