As an expert in Angular development, I know that email validation is a crucial
part of any web application. In this article, I will guide you through the
process of email validation in Typescript Angular 7, providing you with all
the information you need to get started.

What is Email Validation?

email-validation
Email validation is the process of verifying that an email address is valid
and can receive messages. This process involves checking the syntax of the
email address and verifying that it belongs to a valid domain.

How to Implement Email Validation in Typescript Angular 7

Typescript Angular 7 provides a range of built-in validators that you can use
to validate your forms, including an EmailValidator. To implement email
validation in your form, you simply need to add the EmailValidator to the list
of validators for the email input field. Here's an example:

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

this.myForm = this.formBuilder.group({
email: ['', [Validators.required, Validators.email]]
});

In this example, we're using the built-in Validators.required and
Validators.email validators to ensure that the email field is not empty and
contains a valid email address.

Custom Email Validation in Typescript Angular 7

email-validation
If you need to implement custom email validation, you can create a custom
validator function. Here's an example:

import { AbstractControl, ValidatorFn } from '@angular/forms';

export function emailValidator(control: AbstractControl): { [key: string]: any } | null {
const emailRegex = /[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}/;
if (!emailRegex.test(control.value)) {
return { invalidEmail: true };
}

return null;
}

In this example, we're using a regular expression to validate the email
address. If the email address is not valid, we're returning an object with the
key 'invalidEmail' and the value 'true'.

Conclusion

Email validation is an essential part of any web application, and Typescript
Angular 7 provides a range of built-in validators to make the process easier.
By following the steps outlined in this article, you can implement email
validation in your Typescript Angular 7 forms and ensure that your users are
providing valid email addresses.