Refering to : https://angular.io/docs/ts/latest/api/forms/index/FormArrayName-directive.html, it is easy to get a FormArrayName :
HTML:
it worked like a charm for me same as nested form groups .. you need to:
I struggling same problem. And finaly solved it. Firstly we looking to main form array 'cities' structure.
Which is the yellow highlited controls at image is first array control path. => cities
And green highlited control is second array control. => sisterCities
<form [formGroup]="form" (ngSubmit)="onSubmit()">
<div formArrayName="cities">
<div *ngFor="let city of cities.controls; index as i" [formGroupName]="i">
<input [formControlName]="name" placeholder="City">
<div formArrayName="sisterCities"> <!-- this will never work -->
<div *ngFor="let sisterCity of cities.controls[i]sisterCities.controls; index as j">
...
</div>
</div>
</div>
</div>
<button>Submit</button>
</form>
Proper way to access this second nested FormArray is accessing first control array after insert current cities index. And respectively sisterCities
,control
.
let sisterCity of cities.controls[i].sisterCities.controls