angularjs 2 forms validation

How do we display errors in a component view with Angular 2?


In Angular 1, the ng-messages modules are used to help us to display error messages and validation to our forms.

In Angular 2, the ngModel provides error objects for each of the built-in input validators. You can access these errors from a reference to the ngModel itself then build useful messaging around them to display to your users.
And also, we can use the properties “pristine” and “touched” to display error messages.

1.      If we want to display errors after the user fills something in a field, use the pristine property.
2.      If we want to display errors after the user put the focus on a field, use the touched property.

Example as,
<div *ngIf="(!loginForm.controls.email.valid && !loginForm.controls.email.pristine)">
  **Email is required.
</div>

For example 2 click..

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ANIL SINGH

Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..
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