ngFor中的ngModelGroup？

Question

How can I retrieve the validation status of an NgModelGroup that is nested within an NgFor ?

If I don't have the NgFor , I can assign the group to a template variable like this:

<p *ngIf="addressCtrl.invalid">Address is invalid.</p>

<div ngModelGroup="address" #addressCtrl="ngModelGroup">
    <input name="city"  [ngModel]="address.city"  required>
    <input name="state" [ngModel]="address.state" required>
    <input name="zip"   [ngModel]="address.zip"   required>
</div>

But instead I want to have something like this:

<p *ngIf="addressCtrl.invalid">Address # {{index}} is invalid.</p>

<div *ngFor="let address of addresses">
    <div ngModelGroup="address" #addressCtrl="ngModelGroup">
        <input name="city"  [ngModel]="address.city"  required>
        <input name="state" [ngModel]="address.state" required>
        <input name="zip"   [ngModel]="address.zip"   required>
    </div>
</div

The problem is that I get addressCtrl is undefined.

Here is a plunker I created to test this with: https://plnkr.co/edit/RXi2T52kynsWLr4fDMVa?p=preview

Answer 1

It seems to work fine, if you move

<p *ngIf="addressCtrl.invalid">Address # {{index}} is invalid.</p>

inside your iteration.

Your plunker has a bit different code, so there it would be:

<p *ngIf="group.invalid">Address # {{index}} is invalid.</p>

Your forked

Plunker

Answer 2

addressHistory valid? {{ myHistoryGroup.valid }}
<ul ngModelGroup="addressHistory" #myHistoryGroup="ngModelGroup">
    <li *ngFor="let i = index; let address of addressHistory">
        <div [ngModelGroup]="i" #myLi="ngModelGroup">
        address valid? {{ myLi.valid }}
            <input type="text" [(ngModel)]="address.state" name="state" />
            <input type="text" [(ngModel)]="address.country" name="country" />
        </div>
    </li>
</ul>

<!--
#myForm.value will be like this:

{ "addressHistory": { "0": { ... }, "1": { ... }}, ... }
-->

Yes you can, use it like this.