How To Create a Custom Validator for Reactive Forms in Angular

How To Create a Custom Validator for Reactive Forms in Angular

Learn how to create your own validator functions when working with reactive forms in Angular. When using Reactive Forms in Angular, you define custom validators with functions. In this tutorial, you will construct a reactive form with a reusable custom validator to check if a URL meets certain conditions.

Learn how to create your own validator functions when working with reactive forms in Angular.

Angular’s @angular/forms package comes with a Validators class that supports useful built-in validators like required, minLength, maxLength, and pattern. However, there may be form fields that require more complex or custom rules for validation. In those situations, you can use a custom validator.

When using Reactive Forms in Angular, you define custom validators with functions. If the validator does not need to be reused, it can exist as a function in a component file directly. Otherwise, if the validator needs to be reused in other components, it can exist in a separate file.

In this tutorial, you will construct a reactive form with a reusable custom validator to check if a URL meets certain conditions.

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