Reactive form Validation in Angular

Reactive form Validation in Angular

Reactive form Validation in Angular. What is form Validation? Validation form is a process to check where the information provided by the user is met our requirements or not. Angular we have two options to create a form, first one is Template driven form and second one is Reactive form. Create Confirmed Validator.

Table of Contents

  • What Is Form Validation?
  • Template Driven Vs Reactive Forms.
  • Introduction.
  • Create the Angular app.
  • Generate Registration component.
  • Update app-routing.module.ts file.
  • Create Confirmed Validator .

What Is Form Validation?

Form validation is a process to check where the information provided by the user is met our requirements or not.That is provided data is in right format or not. Before Submitting to the server,it is important to ensure all required form fields are filled out in correct format.This article leads you through reactive form fields concepts and examples of form validation in Angular.

Template Driven Vs Reactive Forms.

In Angular we have two options to create a form, first one is Template driven form and second one is Reactive Form. These two comes in @angular/form library and have many control classes. Template-driven forms make use of the “FormsModule“, while reactive forms are based on “ReactiveFormsModule“.Template-driven forms are asynchronous in nature, whereas Reactive forms are mostly synchronous.Template driven form is Suitable for simple scenarios where as Reactive Form Handles any complex scenarios.

Introduction.

Angular is a full-fledged framework, has provided excellent support for validating user inputs and displaying validation messages. It has lots of commonly used built-in validators that we can take advantage of, or we can even write our custom validators. In this post, we will learn about validations in reactive forms in Angular. We will create a simple user registration form and implement some inbuilt validations on it. Along with the inbuilt validations, we will also implement some custom validations to the reactive form.

We will perform the following custom validations for this registration form.

  • Name should be in character and space only.
  • Email id should be in proper format.
  • Mobile no should be number only.
  • Password and Confirm Password should be matched.

angular

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