Toast Notifications for Contact Form

I am trying to configure Toast Notifications like you have on http://themes.semicolonweb.com/html/canvas/contact.php, but I'm not seeing where to configure that in the documentation.

Right now, when the form is completed, it takes the visitor to blank .php page with the success message on there. How do I change that to stay on the page and use the Toast-Message notifications instead?

http://dabbledigital.com/support.html

Also, how can i configure the Required Field errors?

Thanks!

// Form Processing Messages
$message_success = 'We have **successfully** received your Message and will get Back to you as soon as possible.';

if( $_SERVER['REQUEST_METHOD'] == 'POST' ) {
	if( $_POST['template-contactform-email'] != '' ) {

		$name = isset( $_POST['template-contactform-name'] ) ? $_POST['template-contactform-name'] : '';
		$email = isset( $_POST['template-contactform-email'] ) ? $_POST['template-contactform-email'] : '';
		$phone = isset( $_POST['template-contactform-phone'] ) ? $_POST['template-contactform-phone'] : '';
		$website = isset( $_POST['template-contactform-website'] ) ? $_POST['template-contactform-website'] : '';
		$subject = isset( $_POST['template-contactform-subject'] ) ? $_POST['template-contactform-subject'] : '';
		$message = isset( $_POST['template-contactform-message'] ) ? $_POST['template-contactform-message'] : '';

		$subject = isset($subject) ? $subject : 'New Message From Contact Form';

		$botcheck = $_POST['template-contactform-botcheck'];

		if( $botcheck == '' ) {

			$mail->SetFrom( $email , $name );
			$mail->AddReplyTo( $email , $name );
			foreach( $toemails as $toemail ) {
				$mail->AddAddress( $toemail['email'] , $toemail['name'] );
			}
			$mail->Subject = $subject;

			$name = isset($name) ? "Name: $name

" : '';
			$email = isset($email) ? "Email: $email

" : '';
			$phone = isset($phone) ? "Phone: $phone

" : '';
			$website = isset($website) ? "Website URL: $website

" : '';
			$subject = isset($subject) ? "Subject: $subject

" : '';
			$message = isset($message) ? "Message: $message

" : '';

			$referrer = $_SERVER['HTTP_REFERER'] ? '

This Form was submitted from: ' . $_SERVER['HTTP_REFERER'] : '';

			$body = "$name $email $phone $website $subject $message $referrer";

			// Runs only when File Field is present in the Contact Form
			if ( isset( $_FILES['template-contactform-file'] ) && $_FILES['template-contactform-file']['error'] == UPLOAD_ERR_OK ) {
				$mail->IsHTML(true);
				$mail->AddAttachment( $_FILES['template-contactform-file']['tmp_name'], $_FILES['template-contactform-file']['name'] );
			}

			// Runs only when reCaptcha is present in the Contact Form
			if( isset( $_POST['g-recaptcha-response'] ) ) {
				$recaptcha_response = $_POST['g-recaptcha-response'];
				$response = file_get_contents( "https://www.google.com/recaptcha/api/siteverify?secret=" . $recaptcha_secret . "&response=" . $recaptcha_response );

				$g_response = json_decode( $response );

				if ( $g_response->success !== true ) {
					echo '{ "alert": "error", "message": "Captcha not Validated! Please Try Again." }';
					die;
				}
			}

			$mail->MsgHTML( $body );
			$sendEmail = $mail->Send();

			if( $sendEmail == true ):
				echo '{ "alert": "success", "message": "' . $message_success . '" }';
			else:
				echo '{ "alert": "error", "message": "Email **could not** be sent due to some Unexpected Error. Please Try Again later.

**Reason:**
' . $mail->ErrorInfo . '" }';
			endif;
		} else {
			echo '{ "alert": "error", "message": "Bot **Detected**.! Clean yourself Botster.!" }';
		}
	} else {
		echo '{ "alert": "error", "message": "Please **Fill up** all the Fields and Try Again." }';
	}
} else {
	echo '{ "alert": "error", "message": "An **unexpected error** occured. Please Try Again later." }';
}

?>