Angular2 + Typescript Demo Plunk

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>angular2 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>
  <pre>
Required output:

  {
    nested: {
      first: 'one',
      second: 'two',
      third: 'three',
      forth: 'four
    }
  }
  </pre>
  </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, ChangeDetectorRef, NgModule, Pipe, PipeTransform, OnInit } from '@angular/core'
import { FormsModule, ReactiveFormsModule, FormControl, FormGroup, FormArray, FormBuilder } from '@angular/forms';
import { BrowserModule } from '@angular/platform-browser'

@Component({
  selector: 'my-app',
  template: `
    <form [formGroup]="form">
      <fieldset formGroupName="nested">
        <legend>I'm a legend</legend>
        <div *ngFor="let control of form.get('nested').controls | keys; let i = index">
          <label>{{ getLabel(i) }}</label>
          <input [attr.placeholder]="control.value">
        </div>
      </fieldset>
      <input #label value="forth" placeholder="label"><br>
      <input #value value="four" placeholder="value"><br>
      <button (click)="addControl(label.value, value.value)">Add this control</button>
    </form>
    <pre>
Form model:

{{ form.value | json }}
    </pre>
  `
})
export class App implements OnInit {

  private controls: any;
  private form: FormGroup;
  private nested: FormGroup;

  constructor(
    private fb: FormBuilder,
    private cdf: ChangeDetectorRef
    ) {
    this.controls = {
      first: 'one',
      second: 'two',
      third: 'three'
    }
  }
  
  ngOnInit() {
    this.form = this.fb.group({
      nested: this.getControls()
    });
  }
  
  getLabel(index): string {
    return Object.keys(this.controls)[index]
  }
  
  getControls(): FormGroup {
    let group: FormGroup = new FormGroup({});
    Object.keys(this.controls).forEach((key) => {
      let control: FormControl = new FormControl(this.controls[key]);
      group.addControl(key, control);
    })
    return group
  }
  
  addControl(key, value) {
    let control: FormControl = new FormControl(value)
    this.form.get('nested').addControl(key, control);
    this.cdf.detectChanges();
  }
}

@Pipe({
  name: 'keys'
})
export class ObjectKeysPipe implements PipeTransform {

  transform(value: any, args?: any[]): any[] {

    let keyArr = Object.keys(value),
      dataArr = [];

    if (args != null) {
      keyArr = keyArr.filter(v => args.indexOf(v) === -1);
    }

    keyArr.forEach((key) => {
      dataArr.push(value[key])
    })

    return dataArr
  }

}


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