function doalert(checkboxElem) {
            var params = new URLSearchParams(window.location.search);
            var n = $(checkboxElem).data('name');
            if (checkboxElem.checked) {

                _url = location.href;
                _url += (_url.split('?')[1] ? '&' : '?') + n + "=true";
                params.set(n, 'true');
            } else {
                params.set(n, 'false');
            }
            window.location.search = params.toString();
        }