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.

angular

Install Angular in easy step by step process. Firstly Install Node.js & npm, then Install Angular CLI, Create workspace and Deploy your App.

What is Angular? What it does? How we implement it in a project? So, here are some basics of angular to let you learn more about angular. Angular is a Typesc

Sass in Angular is an extension of CSS that allows you to use things like variables, nested rules, inline imports. Angular supports Sass, CSS, and Less.

Angular 11 login with facebook. In this tutorial, you will learn how to login with facebook in angular 8/9/10/11 app.

Angular 11 google login example. In this tutorial, you will learn how to integrate google social login in angular 11 app.