ionic 2 check if user already logged in with angularfire2 - facebook

Question

I did facebook login to my app and I'm trying to check if the user logged in then go to HomePage,if not go to loginPage.
I did it with firebase but I'm trying to do that with angularfire2
that's my code with firebase (I want it in angularfire2)
firebase.auth().onAuthStateChanged((user) => {
var that=this;
if (user) {
if(this.reg_boolean=="true"){
console.log("regCompleted");
this.nav.setRoot(TabsPage,{
dep:this.department,year:this.year,semester:this.semester
})
this.rootPage=TabsPage;
}
else{
this.rootPage = SignupPage;
}
console.log("I'm here! HomePage");
} else {
this.rootPage = LoginPage;
console.log("I'm here! LoginPage");
}
});

Answer 1

I got this to work in app.component.ts file.
import { ViewChild } from '#angular/core';
import { Nav } from 'ionic-angular';
import { AngularFire } from 'angularfire2'; // import this, duh
import { HomePage } from '../pages/home/home';
import { LoginPage } from '../pages/login/login';
export class MyApp {
#ViewChild(Nav) nav: Nav;
rootPage: any;
pages: Array<{ title: string, component: any }>;
userName:string;
constructor(public platform: Platform,
public af: AngularFire,
public authService: AuthenticationService) { // used for logout
this.initializeApp();
// Listen for auth sub
af.auth.subscribe(user => {
this.rootPage = user ? HomePage : LoginPage;
});
....
So basically get listening on the subscribe and change the rootPage based on the value passed into the var user. You can do a console.log() on user if you want to be more specific with the redirection.