silverstripe-userforms/code/formfields/UserFormsGroupField.php

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<?php
/**
* Front end composite field for userforms
*/
class UserFormsGroupField extends UserFormsCompositeField {
public function __construct($children = null) {
parent::__construct($children);
$this->setTag('fieldset');
}
public function getLegend() {
// Legend defaults to title
return parent::getLegend() ?: $this->Title();
}
public function processNext(EditableFormField $field) {
// When ending a group, jump up one level
if($field instanceof EditableFieldGroupEnd) {
return $this->getParent();
}
// Otherwise behave as per normal composite field
return parent::processNext($field);
}
}