Angular + Reactive Forms - Email Validation Example
Example built with Angular 14.2.12 and Reactive Forms
This is a quick example of how to validate an email input field in Angular with Reactive Forms. For a more detailed registration form example that includes a bunch of other fields see Angular 14 - Reactive Forms Validation Example.
Here it is in action: (See on StackBlitz at https://stackblitz.com/edit/angular-reactive-forms-email-validation)
Angular Email Validation App Component
The app component contains an example form (FormGroup) with a single string field for email. The field has a required validator and an email validator, the email validator tests that the input field contains a valid email address.
The onSubmit() method simply displays the form data in a javascript alert when the form is valid.
import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
@Component({ selector: 'app-root', templateUrl: 'app.component.html' })
export class AppComponent implements OnInit {
form!: FormGroup;
submitted = false;
constructor(private formBuilder: FormBuilder) { }
ngOnInit() {
this.form = this.formBuilder.group({
email: ['', [Validators.required, Validators.email]]
});
}
// convenience getter for easy access to form fields
get f() { return this.form.controls; }
onSubmit() {
this.submitted = true;
// stop here if form is invalid
if (this.form.invalid) {
return;
}
// display form values on success
alert('SUCCESS!! :-)\n\n' + JSON.stringify(this.form.value, null, 4));
}
onReset() {
this.submitted = false;
this.form.reset();
}
}
App Component Template
The app component template contains the html markup for displaying the example email validation form in the browser. The form element uses the [formGroup] directive to bind to the form FormGroup in the app component above.
A specific validation message is displayed for each validator by checking the errors object for the input field (*ngIf="f.email.errors.required" and *ngIf="f.email.errors.email").
The form binds the form submit event to the onSubmit() handler in the app component using the Angular event binding (ngSubmit)="onSubmit()". Validation messages are displayed only after the user attempts to submit the form for the first time, this is controlled with the submitted property of the app component.
The reset button click event is bound to the onReset() handler in the app component using the Angular event binding (click)="onReset()".
<div class="card m-3">
<h5 class="card-header">Angular + Reactive Forms - Email Validation</h5>
<div class="card-body">
<form [formGroup]="form" (ngSubmit)="onSubmit()">
<div class="row">
<div class="col mb-3">
<label class="form-label">Email</label>
<input type="text" formControlName="email" class="form-control" [ngClass]="{ 'is-invalid': submitted && f.email.errors }" />
<div *ngIf="submitted && f.email.errors" class="invalid-feedback">
<div *ngIf="f.email.errors.required">Email is required</div>
<div *ngIf="f.email.errors.email">Email must be a valid email address</div>
</div>
</div>
</div>
<div class="text-center">
<button class="btn btn-primary me-2">Submit</button>
<button class="btn btn-secondary" type="reset" (click)="onReset()">Reset</button>
</div>
</form>
</div>
</div>
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