Angular2 - pass value from parent route to child route

Question

I have a route called home, and it has three child routes, documents, mail and a cart. In the component of the home route, it has a variable called "user". I know that there are several ways to transfer information between parent and child components highlighted here , but how can I transfer information between parent / child routes,

{ path: 'home',  component: HomeComponent, children: [
        { path: 'documents',  component: DocumentsComponent },
        { path: 'mail',  component: MailComponent },
        { path: 'trash',  component: TrashComponent },
    ]
},

Service

import { Injectable } from '@angular/core';
@Injectable()
export class HomeService {
  // Mock user, for testing  
  myUser = {name:"John", loggedIn:true};
  // Is Super Admin
  isLogged():boolean {
    if(this.myUser.role == true){
      return true ; 
    }
    return false ; 
  }
}

Component

  constructor(public router: Router, public http: Http, private homeService: HomeService) {

  }

  isLogged(){
    return this.homeService.isLogged(); 
  }

Template

<div class="side-nav fixed" >
    <li style="list-style: none">
        <img alt="avatar" class="circle valign profile-image" height="64" src=
        "../images/avatar.jpg" width="64">
        <div class="right profile-name">
            <!-- Value not changing even with service --> 
            {{myUser.role}} 
        </div>
    </li>

Answer 1

, Angular

, , - .

UserService

   import { Injectable } from '@angular/core';
   import { Subject }    from 'rxjs/Subject';

   @Injectable()
   export class UserService {
     // Observable user 
     user = new Subject<string>();
   }

, , .

HomeComponent

 @Component({
   ... 
 })
 export class HomeComponent{
   ... 
   constructor(private userService:UserService ){}
   someMethod = () =>{
      this.userService.user.next(<pass user object>);
   }
 }

MailComponent

 @Component({
   ... 
 })
 export class HomeComponent{
   ... 
   constructor(private userService:UserService ){
     this.userService.user.subscribe(userChanged);  
   }

   userChanged = (user) => {
     // Do stuff with user
   }
 }

, .

, !

Answer 2

: - https://angular.io/docs/ts/latest/guide/router.html#!#link-parameters-array

: -

<a [routerLink]="['/crisis-center', { foo: myVar }]">Crisis Center</a>