bug(chips-input) NO error state !

Bug, feature request, or proposal:

Bug

<form [formGroup]='group'>
  <mat-form-field class="example-chip-list">
    <mat-chip-list #chipList>
      <mat-chip *ngFor="let fruit of fruits" [selectable]="selectable"
              [removable]="removable" (removed)="remove(fruit)">
        {{fruit.name}}
        <mat-icon matChipRemove *ngIf="removable">cancel</mat-icon>
      </mat-chip>
      <!-- add formContorlName 'newFruit'  -->
      <input placeholder="New fruit..."
            formContorlName='newFruit'
            [matChipInputFor]="chipList"
            [matChipInputSeparatorKeyCodes]="separatorKeysCodes"
            [matChipInputAddOnBlur]="addOnBlur"
            (matChipInputTokenEnd)="add($event)">
    </mat-chip-list>
      <!-- add mat-error  -->
    <mat-error *ngIf="group.controls.newFruit.hasError('required')">required!</mat-error>
  </mat-form-field>
</form>

What is the expected behavior?

In this case, it can display error!

What is the current behavior?

If input is empty, no error will be displayed.

What are the steps to reproduce?

https://stackblitz.com/angular/pxxkxklrgaqg?file=app%2Fchips-input-example.html You can try it on your example…

What is the use-case or motivation for changing an existing behavior?

Displaying error prompts when errors occur

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

All latest

Is there anything else we should know?

No.

[josephperrott]

Closing as the form control should actually go onto the MatChipList since the list is what shows all of the control values.

You can see a fork of the stackblitz here in which if all of the chips are removed will show an error for required.

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