<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <form class="needs-validation" novalidate> <div class="form-row"> <div class="col-md-4 mb-3"> <label for="validationCustom01">First name</label> <input type="text" class="form-control" id="validationCustom01" placeholder="First name" value="Mark" required> <div class="valid-feedback"> Looks good! </div> </div> <div class="col-md-4 mb-3"> <label for="validationCustom02">Last name</label> <input type="text" class="form-control" id="validationCustom02" placeholder="Last name" value="Otto" required> <div class="valid-feedback"> Looks good! </div> </div> <div class="col-md-4 mb-3"> <label for="validationCustomUsername">Username</label> <div class="input-group"> <div class="input-group-prepend"> <span class="input-group-text" id="inputGroupPrepend">@</span> </div> <input type="text" class="form-control" id="validationCustomUsername" placeholder="Username" aria-describedby="inputGroupPrepend" required> <div class="invalid-feedback"> Please choose a username. </div> </div> </div> </div> <div class="form-row"> <div class="col-md-6 mb-3"> <label for="validationCustom03">City</label> <input type="text" class="form-control" id="validationCustom03" placeholder="City" required> <div class="invalid-feedback"> Please provide a valid city. </div> </div> <div class="col-md-3 mb-3"> <label for="validationCustom04">State</label> <input type="text" class="form-control" id="validationCustom04" placeholder="State" required> <div class="invalid-feedback"> Please provide a valid state. </div> </div> <div class="col-md-3 mb-3"> <label for="validationCustom05">Zip</label> <input type="text" class="form-control" id="validationCustom05" placeholder="Zip" required> <div class="invalid-feedback"> Please provide a valid zip. </div> </div> </div> <div class="form-group"> <div class="form-check"> <input class="form-check-input" type="checkbox" value="" id="invalidCheck" required> <label class="form-check-label" for="invalidCheck"> Agree to terms and conditions </label> <div class="invalid-feedback"> You must agree before submitting. </div> </div> </div> <button class="btn btn-primary" type="submit">Submit form</button> </form> <script> // 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 var validation = 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); })(); </script>