undefined

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>Angular 2 router bug repro</title>
    <link rel="stylesheet" href="style.css" />
    <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
    <script src="https://unpkg.com/zone.js/dist/zone.js"></script>
    <script src="https://unpkg.com/zone.js/dist/long-stack-trace-zone.js"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
    <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>
    <script src="config.js"></script>
    <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
  </head>

  <body>
    <my-app>
    loading...
  </my-app>
  </body>

</html>

.nav-child > li.active > a {
    background: #18BC9C;
    color: white;
}

a {
    color: blue;
}

### Angular 2 Router

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  //map tells the System loader where to look for things
  map: {
    
    'app': './src',
    
    '@angular/core': 'npm:@angular/core@2.4.0/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common@2.4.0/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler@2.4.0/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser@2.4.0/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@2.4.0/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http@2.4.0/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router@3.4.0/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms@2.4.0/bundles/forms.umd.js',
    
    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.0.10/lib/typescript.js'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    }
  }
});

//main entry point
import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {AppModule} from './app';

platformBrowserDynamic().bootstrapModule(AppModule)

import {Component, NgModule} from '@angular/core';
import {BrowserModule} from '@angular/platform-browser';
import {AppRoutingModule} from './app-routing.module';
import {HostComponent} from './host-component';
import {ComponentA} from './component-a';
import {ComponentB} from './component-b';

@Component({
  selector: 'my-app',
  template: `<router-outlet></router-outlet>`
})
export class App {
  constructor() {
  }
}

@NgModule({
  imports: [ BrowserModule, AppRoutingModule ],
  declarations: [ App, ComponentA, ComponentB, HostComponent ],
  bootstrap: [ App ]
})
export class AppModule {}

import { NgModule}             from '@angular/core';
import { RouterModule, Routes, Router } from '@angular/router';
import { HostComponent } from './host-component';
import { ComponentA }   from './component-a';
import { ComponentB }   from './component-b';


export const routes: Routes = [
    { path: '', redirectTo: 'host', pathMatch: 'full' },
    { path: 'host', component: HostComponent,
      children: [
        { path: 'a', component: ComponentA,
        { path: 'b', component: ComponentB, }
      ]
    }
];

@NgModule({
    imports: [RouterModule.forRoot(routes)],
    exports: [RouterModule]
})

export class AppRoutingModule {
}

import {Component, 
trigger,
  state,
  style,
  transition,
  animate} from '@angular/core'

@Component({
  selector: 'component-a',
  template: `
    <div>
      <h2>Component A</h2>
    </div>
  `,
  animations: [
  trigger('flyInOut', [
    state('in', style({transform: 'translateX(0)'})),
    transition('void => *', [
      style({transform: 'translateX(-100%)'}),
      animate(100)
    ]),
    transition('* => void', [
      animate(100, style({transform: 'translateX(100%)'}))
    ])
  ])
]
})
export class ComponentA {
  constructor() {
  }
}

import {Component} from '@angular/core';
import {DialogService} from './dialog-service';

@Component({
  selector: 'component-b',
  template: `
    <div>
      <h2>Component B</h2>
    </div>
  `,
})
export class ComponentB {
}

import {Component} from '@angular/core';

@Component({
  selector: 'host-component',
  template: `
  <div>
  <nav>
        <ul class="nav-child">
          <li data-toggle="tab" routerLinkActive="active">
            <a [routerLink]="['a']">A</a>
          </li>
          <li data-toggle="tab" routerLinkActive="active">
            <a [routerLink]="['b']">B</a>
          </li>
        </ul>
      </nav>
            <router-outlet></router-outlet>
    </div>
  `
})
export class HostComponent {
  hostId: number = 1;
  compaId: number = 2;
  compbId: number = 3;
  constructor() {
  }
}