Is it possible to use Validators in the ts.file to display an error message when a field is invalid, rather than directly in the html?
Thanks.
html
<form [formGroup]="form">
<mat-form-field>
<mat-label>Nom</mat-label>
<input matInput formControlName="nom"/>
<div *ngIf="form.get('nom')?.invalid"> error </div> // display this error in ts.file
</mat-form-field>
</form>
ts.file
formulaire(): FormGroup {
this.form = this.fb.group({
nom: ['', [Validators.required]]
})
}
As mentioned in the Angular documentation, it is not possible to directly set an error message when creating a FormControl. This task should be handled within the HTML template.
If you find yourself needing to manage error messages in the TypeScript file, it may be worth reevaluating your approach. Why do you require this functionality in the TypeScript instead of the template?
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