// Example starter JavaScript for disabling form submissions if there are invalid fields (function () { 'use strict' window.addEventListener('load', function () { // Fetch all the forms we want to apply custom Bootstrap validation styles to var forms = document.getElementsByClassName('needs-validation') // Loop over them and prevent submission Array.prototype.filter.call(forms, function (form) { form.addEventListener('submit', function (event) { if (form.checkValidity() === false) { event.preventDefault() event.stopPropagation() } form.classList.add('was-validated') }, false) }) }, false) })()