public function run()
{
$this->registerClientScript();
$content = Html::beginTag('div');
$content .= Html::hiddenInput($this->name, null, ['class' => 'empty-value', 'id' => $this->options['id']]);
$content .= Html::fileInput($this->getFileInputName(), null, ['name' => $this->getFileInputName(), 'id' => $this->getId(), 'multiple' => $this->multiple]);
$content .= Html::endTag('div');
return $content;
}