` section of the page. * If you use the ViewHelper in a plugin, the plugin and its action have to * be cached! */ class LinkViewHelper extends AbstractTagBasedViewHelper { use TagViewHelperTrait; use PageRendererTrait; /** * @var string */ protected $tagName = 'link'; public function initializeArguments(): void { parent::initializeArguments(); $this->registerTagAttribute('rel', 'string', 'Property: rel'); $this->registerTagAttribute('href', 'string', 'Property: href'); $this->registerTagAttribute('type', 'string', 'Property: type'); $this->registerTagAttribute('lang', 'string', 'Property: lang'); $this->registerTagAttribute('dir', 'string', 'Property: dir'); } /** * Render method * * @return string */ public function render() { if (ContextUtility::isBackend()) { return ''; } static::getPageRenderer()->addHeaderData($this->renderTag($this->tagName)); return ''; } }