Resetting a form Angular 2 RC.1

<!DOCTYPE html>
<html>

  <head>
    <title>angular2 playground</title>
    <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>
    <!--  Add SystemJS https://github.com/systemjs/systemjs --> 
    <script src="config.js"></script>
    <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
  </head>

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

</html>

/**
 * 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':                        'app', // '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
*/

import {Component, OnInit, Input} from '@angular/core';
import { bootstrap } from '@angular/platform-browser-dynamic';

import {ControlGroup, FormBuilder, FORM_DIRECTIVES} from '@angular/common';

@Component({
  selector: 'my-app',
  styles: [`label { display:block; }
    .ng-pristine { border: 2px solid green; }` ],
  directives: [FORM_DIRECTIVES],
  template: `
  <form *ngIf="!isResetting" [ngFormModel]="formModel">
    <label for="firstName">First name</label>
    <input id="firstName" ngControl="firstName">
    <label for="lastName">Last name</label>
    <input id="lastName" ngControl="lastName">
    <div>
        <button class="btn" (click)="onReset()">Reset</button>
    </div>
  
    <div>{{formModel.value | json}}</div>
</form>
  `
})
export class AppComponent implements OnInit {
  formModel: ControlGroup;
  hasSubmitted: boolean;
  
  @Input() isResetting = false;

  constructor(private _formBuilder: FormBuilder) {}
  
  ngOnInit() {
    if (!this.formModel) {
      this._buildForm();
    }
  }

  onReset() {
    this._buildForm();
    this.isResetting = true;
    setTimeout(() => this.isResetting = false, 0);
    return false;
  }
  
  _buildForm() {
    this.formModel = this._formBuilder.group({
        firstName: [""],
        lastName: [""]
    });
  }
}

bootstrap(AppComponent);