AdamWathan\Form\Elements\Element::data PHP Method

    public function data($attribute, $value = null)
    {
        if (is_array($attribute)) {
            foreach ($attribute as $key => $val) {
                $this->setAttribute('data-' . $key, $val);
            }
        } else {
            $this->setAttribute('data-' . $attribute, $value);
        }
        return $this;
    }