rxjs observable angular 2 on localstorage change

I am trying to create an observable that returns values when changes to a localStorage variable happens. My subscriber is not getting the new values upon changes to localStorage (or for that matter an in memory variable).

navbar.component.js


import { Component, OnInit } from '@angular/core';
import { UserService } from '../services/user.service';

/**
* This class represents the navigation bar component.
*/
@Component({
moduleId: module.id,
selector: 'sd-navbar',
templateUrl: 'navbar.component.html',
styleUrls: ['navbar.component.css'],
providers: [UserService]
})

export class NavbarComponent implements OnInit {
loggedIn: boolean;
constructor(private us: UserService) { }

ngOnInit() {
this.us.isLoggedIn().subscribe(loggedIn => {
this.loggedIn = loggedIn;
});
}
}

auth.component.ts


import { Component, OnInit } from '@angular/core';
import { ActivatedRoute } from '@angular/router';
import { UserService } from '../shared/services/user.service';

/**
* This class represents the lazy loaded AuthComponent.
*/
@Component({
moduleId: module.id,
selector: 'sd-auth',
templateUrl: 'auth.component.html',
styleUrls: ['auth.component.css'],
providers: [UserService]
})
export class AuthComponent implements OnInit {
authParams = {
provider: '',
params: {}
};

constructor(private route: ActivatedRoute, private us: UserService) { }
ngOnInit() {
this.route.params.forEach((param) => {
this.authParams.provider = param.authprovider;
});

this.route.queryParams.forEach((queryParams) => {
this.authParams.params = queryParams;
});

this.us.logIn("google", JSON.stringify(this.authParams));

console.log(JSON.parse(localStorage.getItem('authParams')));

}
}

user.service.ts


// user.service.ts
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import { Subscriber } from 'rxjs/Subscriber';

@Injectable()
export class UserService {
private loggedIn = false;
private logger = new Observable<boolean>((observer: Subscriber<boolean>) => {
observer.next(this.loggedIn);
});
constructor() {
if (localStorage.getItem('authParams')) {
this.loggedIn = !!JSON.parse(localStorage.getItem('authParams')).params.id_token;
} else {
this.loggedIn = false;
}
}

logIn(provider: string, providerResponse: string) {
localStorage.setItem('authParams', providerResponse);
this.loggedIn = true;
}

isLoggedIn(): Observable<boolean> {
return this.logger;
}

logOut() {
localStorage.removeItem('authParams');
this.loggedIn = false;
}
}


Flow looks like

Step 1- Navbar subscribes to UserService (Gets the default value of loggedIn=false) Step 2 - AuthComponent updates UserService (sets loggedIn = true)

My subscription in Navbar is not getting updated. What am I missing here. Do I need to put something in the logIn method of UserService like event emitter?

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