How can I manually set an Angular form field as invalid?
in component:
formData.form.controls['email'].setErrors({'incorrect': true});and in HTML:
<input mdInput placeholder="Email" type="email" name="email" required [(ngModel)]="email" #email="ngModel"><div *ngIf="!email.valid">{{email.errors| json}}</div>
Adding to Julia Passynkova's answer
To set validation error in component:
formData.form.controls['email'].setErrors({'incorrect': true});To unset validation error in component:
formData.form.controls['email'].setErrors(null);Be careful with unsetting the errors using null as this will overwrite all errors. If you want to keep some around you may have to check for the existence of other errors first:
if (isIncorrectOnlyError){ formData.form.controls['email'].setErrors(null);}
In new version of material 2 which its control name starts with mat prefix setErrors() doesn't work, instead Juila's answer can be changed to:
formData.form.controls['email'].markAsTouched();