Angular 4 loading spinner

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <script type="text/javascript" charset="utf-8">
      window.AngularVersionForThisPlunker = 'latest'
    </script>
    <title>Angular 4 loading spinner</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>

/* Styles go here */

### Angular Starter Plunker - Typescript

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

System.config({
  transpiler: 'ts',
  typescriptOptions: {
    emitDecoratorMetadata: true,
    experimentalDecorators: true
  },
  meta: {
    'typescript': {
      "exports": "ts"
    }
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  map: {
    app: "./src",
    'ngx-duration-picker': 'https://unpkg.com/ngx-duration-picker@latest/bundles/ngx-duration-picker.umd.js',
    '@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/upgrade': 'npm:@angular/upgrade' + angularVersion + '/bundles/upgrade.umd.js',
    '@angular/upgrade/static': 'npm:@angular/upgrade' + angularVersion + '/bundles/upgrade-static.umd.js',

    // other libraries
    'rxjs': 'npm:rxjs',
    'ts': 'npm:plugin-typescript',
    'typescript': 'npm:typescript',
    'ng4-loading-spinner': 'npm:ng4-loading-spinner'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      main: 'index.js',
      defaultExtension: 'js'
    },
    "rxjs/operators": {
      main: 'index.js',
      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 { Ng4LoadingSpinnerModule, Ng4LoadingSpinnerService  } from 'ng4-loading-spinner';

@Component({
  selector: 'my-app',
  template: `
    <ng4-loading-spinner></ng4-loading-spinner>
    <div>
      <h2>Hello {{name}}</h2>
    </div>
    <button (click)="startLoadingSpinner()">Start Loading</button>
  `,
})
export class App {
  name:string;
  constructor(
    private ng4LoadingSpinnerService: Ng4LoadingSpinnerService) {
    this.name = `Angular! v${VERSION.full}`
  }
  
  startLoadingSpinner() {
    this.ng4LoadingSpinnerService.show();
    
    setTimeout(function() {
      this.ng4LoadingSpinnerService.hide();
    }.bind(this), 4000);
  }
}

@NgModule({
  imports: [ BrowserModule, Ng4LoadingSpinnerModule],
  declarations: [ App ],
  bootstrap: [ App ]
})
export class AppModule {}