Angular 2 - NgZone and Dependency injection example

<!DOCTYPE html>
<html>

  <head>
    <title>angular2 playground</title>
    <link rel="stylesheet" href="style.css" />
    <script src="https://npmcdn.com/zone.js@0.6.12"></script>
    <script src="https://npmcdn.com/reflect-metadata@0.1.3"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.27/system.js"></script>
    <script src="https://npmcdn.com/typescript@1.8.10/lib/typescript.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 */

/**
 * PLUNKER VERSION (based on systemjs.config.js in angular.io)
 * System configuration for Angular 2 samples
 * Adjust as necessary for your application needs.
 * Override at the last minute with global.filterSystemConfig (as plunkers do)
 */
(function(global) {

  var ngVer = '@2.0.0-rc.1'; // lock in the angular package version; do not let it float to current!

  //map tells the System loader where to look for things
  var  map = {
    'app':                        'src', // 'dist',
    'rxjs':                       'https://npmcdn.com/rxjs@5.0.0-beta.6',
    'angular2-in-memory-web-api': 'https://npmcdn.com/angular2-in-memory-web-api' // get latest
  };

  //packages tells the System loader how to load when no filename and/or no extension
  var packages = {
    'app':                        { main: 'app.ts',  defaultExtension: 'ts' },
    'rxjs':                       { defaultExtension: 'js' },
    'angular2-in-memory-web-api': { defaultExtension: 'js' },
  };

  var packageNames = [
      '@angular/common',
      '@angular/compiler',
      '@angular/core',
      '@angular/http',
      '@angular/platform-browser',
      '@angular/platform-browser-dynamic',
      '@angular/router-deprecated',
      '@angular/testing',
      '@angular/upgrade',
  ];

  // add map entries for angular packages in the form '@angular/common': 'https://npmcdn.com/@angular/common@0.0.0-3'
  packageNames.forEach(function(pkgName) {
    map[pkgName] = 'https://npmcdn.com/' + pkgName + ngVer;
  });

  // add package entries for angular packages in the form '@angular/common': { main: 'index.js', defaultExtension: 'js' }
  packageNames.forEach(function(pkgName) {
    packages[pkgName] = { main: 'index.js', defaultExtension: 'js' };
  });

  var config = {
    transpiler: 'typescript',
    typescriptOptions: {
      emitDecoratorMetadata: true
    },
    map: map,
    packages: packages
  }

  // filterSystemConfig - index.html's chance to modify config before we register it.
  if (global.filterSystemConfig) { global.filterSystemConfig(config); }

  System.config(config);

})(this);


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

//our root app component
import {Component, ViewChild, NgZone} from '@angular/core';
import {bootstrap} from '@angular/platform-browser-dynamic';
import {Http, HTTP_PROVIDERS} from '@angular/http';


@Component({
  selector: 'my-app',
  template : `
      <h1>Angular 2 - NgZone and Dependency injection example</h1>
      
      <h3>An example how change detection wont work when using async operations that are not part of Zones</h3>
      <h3>Resize the panel between 600px</h3>
      <br><br>
      <p>
      Below is an element with a binding to a property, when a media query changes
      this property changes as well:
      </p>
      <h4 [style.backgroundColor]="color">{{text}}</h4>
      <input id="cbox" type="checkbox" (click)="toggle()" />
      <label for="cbox">Click to enable change detection</label>
      <br><hr><br>
      <p>Below is an element that is not part of the angular change detection process, it's not bound to a property. 
      It will show the actual (and right) screen width:</p>
      <h4 id="element"></h4>
  `,
  directives : []
})
export class App {
  public text: string;
  public runInZone: boolean;
  
  get color(): string {
    return this.text.indexOf('GREATER') > -1 ? 'lightblue' : 'lightgreen';
  }
  constructor(zone: NgZone) {
    const mql: MediaQueryList = window.matchMedia('(min-width: 600px)');
    
    this.text = this.getText(mql);
  
    mql.addListener((mql: MediaQueryList) => {
      document.body.querySelector('#element').innerHTML = this.getText(mql);
      if (!this.runInZone) {
        this.text = this.getText(mql);
      }
      else {
        zone.run(() => {
          this.text = this.getText(mql);
        }); 
      }
    });
    
  }

  toggle() {
    this.runInZone = !this.runInZone;
  }
  getText(mql: MediaQueryList) {
    return 'Screen Width: ' + (mql.matches ? '  GREATER then 600px' : ' LOWER then 600px');
  }
  
  ngAfterViewInit() {
    // only from this point we know for sure that the template has rendered.
    document.body.querySelector('#element').innerHTML = this.text;
  }
}

bootstrap(App, [...HTTP_PROVIDERS]).catch(err => console.error(err));