public function text()
{
if (isset($this->text_on) and isset($this->text_off)) {
$text = '<span class="tgl-text-on">' . $this->text_on . '</span>';
$text .= '<span class="tgl-text-off">' . $this->text_off . '</span>';
} else {
$text = parent::text();
}
return empty($text) ? ' ' : $text;
}