Example 1: P Tag State on Button Click

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>angular2 playground</title>
    <link rel="stylesheet" href="style.css" />
    <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>

/* Styles go here */

### Angular Starter Plunker - Typescript

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/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
    
    '@angular/core/testing': 'npm:@angular/core/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common/bundles/common-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router/bundles/router-testing.umd.js',
    
    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.0.2/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,
  
  // animation specific imports
  trigger,
  state,
  style,
  transition,
  animate
  
} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'

@Component({
  selector: 'my-app',
  template: `
    <div>
      <h2>Example 1: P Tag State on Button Click</h2>
      <p>A simple animation example where a P Tag transitions between two states: Active & Inactive.</p>
      <p>"Active" shows a string with high lighted background.</p>
      <p>"Inactive" shows a 'greyer' and smaller p tag</p>
      
      <!-- quick debug to see what happens when we click the button -->
      <pre>Current Status: {{ pStatus | json }}</pre>
      
      <button (click)="toggleP()">Toggle P Tag Status</button>
      
      <p [@pState]="pStatus">Lorem ipsum dorem</p>
      
    </div>
  `,
  
  // animations are defined in a per component basis
  animations: [
    
    /**
     * Triggers: what starts and stops an animation
     */
    trigger('pState', [
      
      // make the bground grey and the text a little smaller
      // to indicate the p tag is 'inactive'
      state('inactive', style({
        backgroundColor: '#efefef',
        transform: 'scale(.9)'
      })),
      
      // make the bground yellow and the text bold to indicate the
      // p tag is 'active'
      state('active',   style({
        fontWeight: "bold",
        backgroundColor: '#eeff00',
        transform: 'scale(1)'
      })),
      
      /**
       * Transitions: Define the animation state transitions
       */
      
      transition('active => inactive', animate('300ms ease-out')),
      
      // note this transition is a little slower for demo purposes
      transition('inactive => active', animate('100ms ease-in'))
    ])
  ]
  
})
export class App {
  
  pStatus: string;
  
  constructor() {
    this.pStatus = "active";
  }
  
  toggleP() {
    this.pStatus = (this.pStatus == "inactive") ? "active" : "inactive";
  }
}

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