// change the default validation messages
                            var inputElements = document.getElementsByTagName("input");
                            console.log(inputElements);
                            for (var i = 0; i < inputElements.length; i++) {
                                console.log("ok");
                                inputElements[i].oninvalid = function(e) {
                                    e.target.setCustomValidity("");
                                    if (!e.target.validity.valid) {
                                        e.target.setCustomValidity("Bitte füllen Sie dieses Feld aus.");
                                    }
                                };
                                inputElements[i].oninput = function(e) {
                                    e.target.setCustomValidity("");
                                };
                            }
                            var selectElements = document.getElementsByTagName("select");