CODEWITHSUNDEEP
angularangular2-forms
Robin Dijkhof
Robin Dijkhof

Reputation: 19278

Angular2 can I get the validators set on a form control?

I wrote a custom control component and I want to get which validators are set on it. I want te get which validators are set so I can add a * for a required field for example. I am using template driven form.

Is this possible and how?

My Component:

@Component({
    selector: 'input-text2',
    templateUrl: './input-text2.component.html',
    styleUrls: ['/input-base2.scss', './input-text2.component.scss'],
    providers: [
        { provide: NG_VALUE_ACCESSOR, multi: true, useExisting: InputText2Component }
    ]
})
export class InputText2Component extends InputBase2 implements ControlValueAccessor, OnInit {

    private ngControl: NgControl;


    value: string;
    valueChange: (value: any) => void;
    _onTouched: (value: any) => void;

    constructor(private injector: Injector) {
        super();
    }

    ngOnInit(): void {
        this.ngControl = this.injector.get(NgControl);
    }

    ..//other methods
}

plunker

Second plunker

Upvotes: 2

Views: 874

Answers (1)

Günter Zöchbauer
Günter Zöchbauer

Reputation: 657308

I think adding these constructor dependencies to your component should get you the validators.

@NgModule({
  imports: [ BrowserModule, FormsModule, ReactiveFormsModule ],

constructor(@Optional() @Inject(NG_VALIDATORS) private validators, 
            @Optional() @Inject(NG_ASYNC_VALIDATORS) private validators) {}

The FormsModule should export these tokens.

Plunker example

Upvotes: 1

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