silverstripe-framework/admin/code/CMSForm.php

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<?php
/**
* Deals with special form handling in CMS, mainly around {@link PjaxResponseNegotiator}
*/
class CMSForm extends Form {
/**
* Route validation error responses through response negotiator,
* so they return the correct markup as expected by the requesting client.
*/
protected function getValidationErrorResponse() {
$request = $this->getRequest();
$negotiator = $this->getResponseNegotiator();
if($request->isAjax() && $negotiator) {
$negotiator->setResponse(new SS_HTTPResponse($this));
return $negotiator->respond($request);
} else {
return parent::getValidationErrorResponse();
}
}
/**
* Sets the response negotiator
* @param ResponseNegotiator $negotiator The response negotiator to use
* @return Form The current form
*/
public function setResponseNegotiator($negotiator) {
$this->responseNegotiator = $negotiator;
return $this;
}
/**
* Gets the current response negotiator
* @return ResponseNegotiator|null
*/
public function getResponseNegotiator() {
return $this->responseNegotiator;
}
}