Angular Nested Form - Using a directive to provide the parent form in child components

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>angular 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>
  </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/animations': 'npm:@angular/animations/bundles/animations.umd.js',
    '@angular/platform-browser/animations': 'npm:@angular/platform-browser/bundles/platform-browser-animations.umd.js',
    '@angular/animations/browser': 'npm:@angular/animations/bundles/animations-browser.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@2.2.1/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, VERSION, Input, ViewEncapsulation, Directive } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { FormsModule, NgForm, ControlContainer } from '@angular/forms';
import { Pipe, PipeTransform } from '@angular/core';

import {FilterPipe} from './pipe'


@Component({
  selector: 'my-app',
  template: `
    <fieldset>
      <legend>Parent Component</legend>
      <p>Super Hero Name: {{superHeroName}}</p>
      
      <form #superHeroForm="ngForm">
        <label>Name:</label>
        <input type="text" [(ngModel)]="superHeroName" name="superHeroName" />
        
        <child></child>
      </form>
      
      <p style="color: blue">
      Form value: 
      {{superHeroForm.value | json}}
      </p>
    </fieldset>
  `
})
export class App {
  superHeroName: string = 'Mr. Cool';
}

@Component({
  selector: 'child',
  template: `
    <fieldset provide-parent-form>
      <legend>Child</legend>
      <p>Super Hero Power: {{superHeroPower}}</p>
    
      <label>Power:</label>
      <input type="text" [(ngModel)]="superHeroPower" name="power" />
    </fieldset>
  `
})
export class Child {
  superHeroPower: string = 'Unstoppable Coolness';
}

@Directive({
    selector: '[provide-parent-form]',
    providers: [
        {
            provide: ControlContainer,
            useFactory: function (form: NgForm) {
                return form;
            },
            deps: [NgForm]
        }
    ]
})
export class ProvideParentForm {}

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

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
    name: 'FilterPipe',
})
export class FilterPipe implements PipeTransform {
    transform(value: any, input: string) {
        if (input) {
            input = input.toLowerCase();
            return value.indexOf(input) > -1;
            
        }
        return value;
    }
}