protected function renderPrompt($writer)
{
$text = $this->getPromptText();
$value = $this->getPromptValue();
if ($value === '') {
$value = $text;
}
if ($value !== '') {
$writer->addAttribute('value', $value);
$writer->renderBeginTag('option');
$writer->write(THttpUtility::htmlEncode($text));
$writer->renderEndTag();
$writer->writeLine();
}
}