How do I use form validators with form groups in Angular?

How do I use form validators with form groups in Angular?

You can use Angular's Reactive Forms to create form groups and apply validators. First, import ReactiveFormsModule in your module.

Can you show me an example of a form group with validators?

Sure! Here's a simple example:

import { FormGroup, FormBuilder, Validators } from '@angular/forms';

this.form = this.fb.group({
  name: ['', Validators.required],
  email: ['', [Validators.required, Validators.email]],
});

What if I want to add custom validators?

You can create custom validators by defining a function that returns either null or an error object. Then, use it in your form group.

Can you give me an example of a custom validator?

Certainly! Here's a simple custom validator for checking if a control's value is 'test':

function testValidator(control: AbstractControl) {
  return control.value === 'test' ? { invalid: true } : null;
}