Is it possible for RouteData in Angular 2 to transmit variables from a parent component to routed components?

How can I pass a variable from my AppComponent to CoursesComponent using RouteConfig? The "data" property in route config seems to only accept constant parameters and cannot recognize "this". Is there a workaround for this limitation?

If not, what is the recommended approach for passing variables to routed components?

@Component({
    selector: 'app',
    template: `
    <router-outlet></router-outlet>
    `,

directives: [ROUTER_DIRECTIVES],
})

@RouteConfig([
    { path: '/courses'
      , name: 'Courses' 
      ,component: CoursesComponent
       ,data:{token:this.token}}  // Attempting to access "token" here causes an error - cannot read property "token" of undefined

])

export class AppComponent  {
    token:string;
//I need to update the token (string) in this component and pass it to the routed components

}

Answer №1

To achieve this functionality, I have utilized a dynamic routing approach within the component constructor. Below is an illustration:

import {Router,ROUTER_DIRECTIVES} from 'angular2/router';
import {Component} from 'angular2/core';

@Component({
  selector: "app",
  template: '<router-outlet></router-outlet>',
  directives: [ROUTER_DIRECTIVES]
})
export class AppCmp{
  public token:string;
  constructor(private _router:Router){
    var config = [];
    if(!this._router.registry.hasRoute("Courses",AppCmp))
      config.push({ path: '/courses', name: 'Courses',component: CoursesComponent,data:{token:this.token});

    this._router.config(config)
  }
}

Answer №2

To facilitate communication between components, consider utilizing a shared service.

For a detailed guide on how to set up a shared service in Angular 2, refer to Implementing Shared Service in Angular 2.

Another option is to inject the Router and use its router.navigateXxx() functions to navigate with additional data.

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