protected function setNode(\DOMElement $node)
{
$this->button = $node;
if ('button' === $node->nodeName || ('input' === $node->nodeName && in_array(strtolower($node->getAttribute('type')), array('submit', 'button', 'image')))) {
if ($node->hasAttribute('form')) {
// if the node has the HTML5-compliant 'form' attribute, use it
$formId = $node->getAttribute('form');
$form = $node->ownerDocument->getElementById($formId);
if (null === $form) {
throw new \LogicException(sprintf('The selected node has an invalid form attribute (%s).', $formId));
}
$this->node = $form;
return;
}
// we loop until we find a form ancestor
do {
if (null === $node = $node->parentNode) {
throw new \LogicException('The selected node does not have a form ancestor.');
}
} while ('form' !== $node->nodeName);
} elseif ('form' !== $node->nodeName) {
throw new \LogicException(sprintf('Unable to submit on a "%s" tag.', $node->nodeName));
}
$this->node = $node;
}