Angular2 form ControlGroup who hold an undefined number of Control

Question

How to manage with Angular2 a form who hold an undefined number of field ?

In my case, I need to create a from where user can add and delete some block of fileds. It's like an address book where user can add one or ten address. And each address had a some fields like street, street number and so on.

My look like this :

let address = fb.group({
        street: fb.control(null, Validators.required),
        streetNumber fb.control(null, Validators.required)
    });

this.userForm = fb.group({
        name: fb.control(null, Validators.required),
        firstName: fb.control(null, Validators.required),
        address: fb.group({
            1: address
            })
        });

I really don't know how to manage this in the template.

I've try to write some thing like that in the template, but obviously, it doesn't work...

<form [ngFormModel]="userForm">
<input type="text" ngControl="name" #name="ngForm"/>
<input type="text" ngControl="firstName" #firstName="ngForm"/>

<div *ngFor="#address of userForm.controls['address'].controls">
    <input type="text" ngControl="street" #street="ngForm"/>
    <input type="text" ngControl="streetNumber" #streetNumber="ngForm"/>
</div>

EDIT

I've made a Plunker for a better explanation http://plnkr.co/edit/ffYe1479WnxYOQrbxwLF?p=preview

Answer 1

I implemented it for you, see Plunker or better yet, Plunker -@waldo

import {Component} from 'angular2/core';
import {
  FORM_DIRECTIVES, FormBuilder, ControlGroup, ControlArray, Validators, NgForm, Control,
  AbstractControl
} from 'angular2/common';

@Component({
  selector: 'my-app',
  template: `
    <form [ngFormModel]="userForm" *ngIf="userForm">
      <p><label><input id="date" type="text" ngControl="name" #name="ngForm"/> Name</label></p>

      <p><label><input id="date" type="text" ngControl="firstName" #firstName="ngForm"/> FirstName</label></p>

      <h3>Add address</h3>
        <ul ngControlGroup="addresses">

        <li *ngFor="#ctrl of objToArray(userForm.find('addresses').controls); #i = index" 
        ngControlGroup="{{ctrl}}">
           {{ctrl}}:
          <input ngControl="street" placeholder="Street">
          <input ngControl="streetNumber"  placeholder="StreetNumber"> 
        </li>
      </ul>

    <div (click)="addAddress()" style="cursor: pointer"> Add Another Address</div>

    </form>

    `,
  directives: [FORM_DIRECTIVES]
})
export class AppComponent {
  userForm: ControlGroup;

  constructor(private fb: FormBuilder) {

    this.userForm = fb.group({
      name: fb.control(null, Validators.required),
      firstName: fb.control(null, Validators.required),
      addresses: fb.group({
        address1: fb.group({
          street: fb.control(null, Validators.required),
          streetNumber: fb.control(null, Validators.required)
        })
      })
    });

    console.log(this.userForm);

  }

  objToArray(o){
    return Object.keys(o);
  }

  addAddress() {
    let addressField = this.fb.group({
      street: this.fb.control(null, Validators.required),
      streetNumber: this.fb.control(null, Validators.required)
    });

    (<ControlGroup>this.userForm.find('addresses')).addControl(
      'address' + (Object.keys((<ControlGroup>this.userForm.find('addresses')).controls).length + 1), addressField);
  }
}