The easiest way to give child components access to the parent form object is to add the following to your child component:

import { ControlContainer, NgForm } from '@angular/forms';

@Component( {
	viewProviders: [ { provide: ControlContainer, useExisting: NgForm } ]
} )

What’s happening here?

Well, when adding a form control in your child component, if no NgForm object exists you’ll be hit with a number of errors.

ControlContainer is a class within NgForm which is called when adding controls – when adding a control using the above code, we’re telling the controller to use the parent NgForm object instead of the non-existent NgForm ControlContainer in the current controller. Simples…