class.ilDclCheckboxInputGUI.php

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<?php

require_once('./Services/Form/classes/class.ilCheckboxInputGUI.php');

class ilDclCheckboxInputGUI extends ilCheckboxInputGUI
{

    public function checkInput()
    {
        if ($this->getRequired() && !isset($_POST[$this->getPostVar()])) {
            global $lng;
            $this->setAlert($lng->txt("msg_input_is_required"));
            return false;
        }

        return parent::checkInput();
    }

}