Email Validation in Angular 4

Angular 4 is a popular JavaScript framework that is used for building web applications. One of the features of Angular 4 is email validation, which is important for ensuring that users enter valid email addresses. In this article, we will explore email validation in Angular 4 and answer some of the most commonly asked questions about this topic.

What is Email Validation?

Email validation is the process of checking if an email address is valid or not. An email address is considered valid if it conforms to the syntax rules of the email protocol. These rules specify the format of email addresses and the characters that are allowed in them. Email validation is important for ensuring that users enter valid email addresses when filling out forms or registering for services.

Why is Email Validation Important?

Email validation is important for several reasons:

• Preventing typos: Email validation can help prevent users from entering incorrect email addresses due to typos or other errors.
• Preventing fraud: Email validation can help prevent fraud by ensuring that users enter valid email addresses that can be verified.
• Improving user experience: Email validation can improve the user experience by providing immediate feedback if an email address is invalid.

Email Validation in Angular 4

Angular 4 provides several built-in validators for validating form input. One of these validators is the EmailValidator, which can be used to validate email addresses. To use the EmailValidator, you need to import it from the @angular/forms module:

import { Validators } from '@angular/forms';

export class MyComponent {
    emailFormControl = new FormControl('', [
        Validators.required,
        Validators.email,
    ]);
}
export function emailValidator(control: FormControl): { [key: string]: any } | null {
    const emailRegex = /^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,}$/i;
    const valid = emailRegex.test(control.value);
    return valid ? null : { invalidEmail: true };
}

export class MyComponent {
    emailFormControl = new FormControl('', [
        Validators.required,
        emailValidator,
    ]);
}