/**
* Renders hidden form fields for referrer information about
* the current request.
*
* @return string Hidden fields with referrer information
*/
protected function renderHiddenReferrerFields()
{
$tagBuilder = new TagBuilder('input');
$tagBuilder->addAttribute('type', 'hidden');
$tagBuilder->addAttribute('name', $this->prefixFieldName('__state'));
$serializedFormState = base64_encode(serialize($this->arguments['object']->getFormState()));
$tagBuilder->addAttribute('value', $this->hashService->appendHmac($serializedFormState));
return $tagBuilder->render();
}
/**
* Sets the tag name to $this->tagName.
* Additionally, sets all tag attributes which were registered in
* $this->tagAttributes and additionalArguments.
*
* Will be invoked just before the render method.
*
* @return void
* @api
*/
public function initialize()
{
parent::initialize();
$this->tag->reset();
$this->tag->setTagName($this->tagName);
if ($this->hasArgument('additionalAttributes') && is_array($this->arguments['additionalAttributes'])) {
$this->tag->addAttributes($this->arguments['additionalAttributes']);
}
if (isset(self::$tagAttributes[get_class($this)])) {
foreach (self::$tagAttributes[get_class($this)] as $attributeName) {
if ($this->hasArgument($attributeName) && $this->arguments[$attributeName] !== '') {
$this->tag->addAttribute($attributeName, $this->arguments[$attributeName]);
}
}
}
}
