principal.isAuthenticated()

principal.hasAnyAuthority(['ROLE_ADMIN'])

ngAfterContentChecked() {
    console.log('ngAfterContentChecked');
    console.log(this.principal.isAuthenticated());
}

<div>{{isAuthenticated()}}</div>

if(!this.isAuthenticated()) {
  this.model.push({ label: 'Sign in', icon: 'fa fa-fw fa-sign-in', command: (onclick)=> {this.login()} });
} else {
  this.model.push({ label: 'Sign out', icon: 'fa fa-fw fa-sign-in', command: (onclick)=> {this.logout()} });
}

this.principal.identity().then((account) => {
        this.currentAccount = account;
    });

core.js?593e:1440 ERROR TypeError: _this.connectedPromise is not a function
    at eval (tracker.service.ts?aa77:50)
    at eval (webstomp.js?afe9:292)
    at Array.forEach (<anonymous>)
    at SockJS.ws.onmessage (webstomp.js?afe9:284)
    at SockJS.EventTarget.dispatchEvent (eventtarget.js?d62b:51)
    at eval (main.js?8e93:274)
    at Array.forEach (<anonymous>)
    at SockJS._transportMessage (main.js?8e93:272)
    at WebSocketTransport.EventEmitter.emit (emitter.js?a8c1:50)
    at WebSocketTransport.ws.onmessage [as __zone_symbol__ON_PROPERTYmessage] (websocket.js?a354:35)
defaultErrorLogger @ core.js?593e:1440
ErrorHandler.handleError @ core.js?593e:1501
next @ core.js?593e:5481
schedulerFn @ core.js?593e:4319
SafeSubscriber.__tryOrUnsub @ Subscriber.js?3959:240
SafeSubscriber.next @ Subscriber.js?3959:187
Subscriber._next @ Subscriber.js?3959:128
Subscriber.next @ Subscriber.js?3959:92
Subject.next @ Subject.js?8398:56
EventEmitter.emit @ core.js?593e:4299
(anonymous) @ core.js?593e:4755
ZoneDelegate.invoke @ zone.js?6524:388
Zone.run @ zone.js?6524:138
NgZone.runOutsideAngular @ core.js?593e:4681
onHandleError @ core.js?593e:4755
ZoneDelegate.handleError @ zone.js?6524:392
Zone.runTask @ zone.js?6524:191
ZoneTask.invokeTask @ zone.js?6524:495
invokeTask @ zone.js?6524:1536
globalZoneAwareCallback @ zone.js?6524:1562

ngOnInit() {
  setTimeout(() => {
    this.loadMenu();
  }, 0);
}

ngOnInit() {

      /**
       * This will load the menu, but only show items that do not require login
       * because the principal is not valued yet.
       */
      this.loadMenu();

      /**
       * This interval will run until the user is authenticated and then will reload the menu and clear the interval.
       */
      this.intervalId = setInterval(() => {
          if(this.isAuthenticated()) {
              this.loadMenu();
              clearInterval(this.intervalId);
          }
      }, 100);
    }

ngOnInit() {
    this.registerAuthenticationSuccess();
  }


  registerAuthenticationSuccess() {
    this.eventManager.subscribe('authenticationSuccess', (message) => {
      this.getAccount();
    });
  }


  getAccount() {
    this.principal.identity().then((account) => {
      this.account = account;
    });
  }