Prado\Web\UI\WebControls\TBaseValidator::getFocusElementID PHP Метод

    public function getFocusElementID()
    {
        if (($id = $this->getViewState('FocusElementID', '')) === '') {
            $target = $this->getValidationTarget();
            /* Workaround: TCheckBoxList and TRadioButtonList nests the actual
             * inputs inside a table; we ensure the first input gets focused
             */
            if ($target instanceof TCheckBoxList && $target->getItemCount() > 0) {
                $id = $target->getClientID() . '_c0';
            } else {
                $id = $target->getClientID();
            }
        }
        return $id;
    }