angular - In angular2 I want my component to talk to another component, how is this possilbe? -

in angular2 want component talk component, how possilbe?

i have component needs broadcast component that component can update itself.

i know how in angular v1.

i have no code show, have no idea how this.

the components separate , not nested. how can them talking each other e.g. event or something?

i have login service defines loggedin observable:

private loggedin$: subject<loggedin>;  constructor() {    this.loggedin$ = <subject<loggedin>>new subject(); } 

i defined 2 methods set , get:

setloggedin(loggedin: loggedin): void {     this.loggedin$.next(loggedin); }  getloggedin(): observable<loggedin> {     return this.loggedin$.asobservable(); } 

the logged in class:

export interface iloggedin {   email: string;   password: string;   error: string; }  export class loggedin implements iloggedin {   email: string;   password: string;   error: string    constructor(email: string, password: string, error: string) {      this.email = email;      this.password = password;      this.error = error;    } } 

with that, can notified user logged in anywhere in app subscribing observable:

constructor(    private ls: loginservice,    private ss: settingsservice) { }       ngoninit() {    this.ls.getloggedin()    .subscribe(       loggedin => {          this.items = this.as.getloggedinmenu();           var = this.ss.getusersettings();              this.ts.settheme(us.theme);     });  }