Angular 4, dynamic tabs

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <script type="text/javascript" charset="utf-8">
      window.AngularVersionForThisPlunker = 'latest'
    </script>
    <title>angular playground</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>

div.tab-header {
  display: flex;
  flex-wrap: wrap;
  box-sizing: border-box;
  flex-direction: row;
  justify-content: flex-start;
  align-items: stretch;
}

div.tab-content {
  padding: 40px;
}

div.tab-header > div.tab {
  text-align: center;
  box-sizing: border-box;
  cursor: pointer;
  margin: 10px;
  width: 100px;
  background-color: lightgrey;
  padding: 20px;
}

div.tab-header > div.tab:hover {
  background-color: white;
  color: red;
}

div.tab-header > div.tab.active {
  background-color: beige;
  color: red;
}

### Angular Starter Plunker - Typescript

var angularVersion;
if(window.AngularVersionForThisPlunker === 'latest'){
  angularVersion = ''; //picks up latest
}
else {
  angularVersion = '@' + window.AngularVersionForThisPlunker;
}

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'+ angularVersion + '/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common' + angularVersion + '/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler' + angularVersion  + '/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic' + angularVersion + '/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http' + angularVersion + '/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router' + angularVersion +'/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms' + angularVersion + '/bundles/forms.umd.js',
    '@angular/animations': 'npm:@angular/animations' + angularVersion + '/bundles/animations.umd.js',
    '@angular/platform-browser/animations': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser-animations.umd.js',
    '@angular/animations/browser': 'npm:@angular/animations' + angularVersion + '/bundles/animations-browser.umd.js',
    
    '@angular/core/testing': 'npm:@angular/core' + angularVersion + '/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common' + angularVersion + '/bundles/common-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler' + angularVersion + '/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic' + angularVersion + '/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http' + angularVersion + '/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router' + angularVersion + '/bundles/router-testing.umd.js',
    'tslib': 'npm:tslib@1.6.1',
    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.2.1/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)

//our root app component
import {Component, NgModule, VERSION} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import {TabContainerComponent} from './tab/tab-container.component'
import {TabComponent} from './tab/tab.component'
import {TabContentComponent} from './tab/tab-content.component'
import {TabContentAlternativeComponent} from './tab/tab-content-alternative.component'
import {TabHeaderComponent} from './tab/tab-header.component'

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

@NgModule({
  imports: [ BrowserModule ],
  declarations: [ App, TabComponent, TabContainerComponent, TabContentAlternativeComponent, TabContentComponent, TabHeaderComponent ],
  entryComponents: [ TabContentComponent, TabContentAlternativeComponent ]
  bootstrap: [ App ]
})
export class AppModule {}

import {Component} from '@angular/core'
import {TabContentComponent} from './tab-content.component'
import {TabComponent} from './tab.component'
import {BasicContent} from 'basic-content'
import {TabContentComponent} from './tab-content.component'
import {TabContentAlternativeComponent} from './tab-content-alternative.component'

import 'rxjs/Rx';
import {Observable, BehaviorSubject} from 'rxjs/Rx';

@Component({
  selector: 'tab-container',
  template: `
    <tab-header (activate)="loadContent($event)">
      <tab title="Tab 1" [contentRef]="normalContent"></tab>
      <tab title="Tab 2" [contentRef]="alternativeContent"></tab>
    </tab-header>
    
    <div class="tab-content">
      <ng-container *ngComponentOutlet="content | async"></ng-container>
    </div>
  `,
})
export class TabContainerComponent {
  private contentSbj = new BehaviorSubject<BasicContent>(null);
  content = this.contentSbj.asObservable();
  
  normalContent = TabContentComponent;
  alternativeContent = TabContentAlternativeComponent;
  
  loadContent(ref) {
    this.contentSbj.next(ref);
  }
}

import {Component, Input} from '@angular/core'
import {TabContentAlternativeComponent} from './tab-content-alternative.component'
import {BasicContent} from './basic-content'

@Component({
  selector: 'tab',
  template: ''
})
export class TabComponent {
  @Input() title: string;
  @Input() contentRef: BasicContent;
  active = false;
}

import {Component, Input, OnInit} from '@angular/core'
import {BasicContent} from './basic-content'

@Component({
  selector: 'tab-content',
  template: `
      <p>Hey</p>
  `,
})
export class TabContentComponent extends BasicContent {
}

import {Component, Input} from '@angular/core'
import {BasicContent} from './basic-content'

@Component({
  selector: 'tab-content-alternative',
  template: `
      <p>Hey, this is an alternative content</p>
  `,
})
export class TabContentAlternativeComponent extends BasicContent {
}

import {AfterContentInit, Component, ContentChildren, EventEmitter, Output} from '@angular/core'
import {TabComponent} from './tab.component'
import {TabContentComponent} from './tab-content.component'
import {BasicContent} from 'basic-content'

@Component({
  selector: 'tab-header',
  template: `
      <div class="tab-header">
        <div class="tab" *ngFor="let tab of tabs" (click)="selectTab(tab)" [class.active]="tab.active">{{tab.title}}</div>
      </div>
  `,
})
export class TabHeaderComponent implements AfterContentInit {
  @ContentChildren(TabComponent) tabs: QueryList<TabComponent>;
  @Output('activate') activate = new EventEmitter<BasicContent>();
  
  ngAfterContentInit() {
    const activeTabs = this.tabs.filter((tab) => tab.active);
    if (activeTabs.length === 0) {
      this.selectTab(this.tabs.first);
    }
  }

  selectTab(tab: TabComponent) {
    this.tabs.toArray().forEach(tab => tab.active = false);
    tab.active = true;
    this.activate.emit(tab.contentRef);
  }
}

import {TabContentComponent} from './tab-content.component';
import {TabContentAlternativeComponent} from './tab-content-alternative.component';

interface TitleMapping {
  title: string;
  contentComponent: BasicContent;
}

export const allTabs: TitleMapping[] = [
  {title: "Tab 1", contentComponent: TabContentComponent},
  {title: "Tab 2", contentComponent: TabContentAlternativeComponent},
  {title: "Tab 3", contentComponent: TabContentComponent}
]

export class BasicContent {
  
}