Angular

Last Updated: 8/31/2023

Validating on Submitting Form

Async validators are useful for validating input field in place
To perform validation on submitting form to the server

<form [formGroup]="form" (ngSubmit)="login()">
	<div *ngIf="form.errors">The username or password is invalid</div>
</form>

login() {
	//after service response from server
	this.form.setErrors({invalidLogin: true})
	//this.username.setError({})
}
```