silverstripe-userforms/code/model/editableformfields/EditableEmailField.php

<?php
/**
 * EditableEmailField
 *
 * Allow users to define a validating editable email field for a UserDefinedForm
 *
 * @package userforms
 */

class EditableEmailField extends EditableFormField {
	
	private static $singular_name = 'Email Field';
	
	private static $plural_name = 'Email Fields';
	
	public function getSetsOwnError() {
		return true;
	}
	
	public function getFormField() {
		$field = EmailField::create($this->Name, $this->EscapedTitle, $this->Default);
		$this->doUpdateFormField($field);
		return $field;
	}
	
	/**
	 * Updates a formfield with the additional metadata specified by this field
	 *
	 * @param FormField $field
	 */
	protected function updateFormField($field) {
		parent::updateFormField($field);

		$field->setAttribute('data-rule-email', true);
	}
}