Disable form submission any time a field in target form is invalid or required.
<!DOCTYPE html>
<html>
<head>
<title>Disable Form Submission on Invalid Form Field</title>
<style type="text/css">
.invalid-feedback {
display: none;
width: 100%;
margin-top: 0.25rem;
font-size: 80%;
color: #dc3545;
}
.valid-feedback {
display: none;
width: 100%;
margin-top: 0.25rem;
font-size: 80%;
color: #28a745;
}
.valid-tooltip {
position: absolute;
top: 100%;
z-index: 5;
display: none;
max-width: 100%;
padding: 0.25rem 0.5rem;
margin-top: .1rem;
font-size: 0.875rem;
line-height: 1.5;
color: #fff;
background-color: rgba(40, 167, 69, 0.9);
border-radius: 0.25rem;
}
.was-validated .form-control:valid, .form-control.is-valid {
border-color: #28a745;
padding-right: calc(1.5em + 0.75rem);
background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%2328a745' d='M2.3 6.73L.6 4.53c-.4-1.04.46-1.4 1.1-.8l1.1 1.4 3.4-3.8c.6-.63 1.6-.27 1.2.7l-4 4.6c-.43.5-.8.4-1.1.1z'/%3e%3c/svg%3e");
background-repeat: no-repeat;
background-position: right calc(0.375em + 0.1875rem) center;
background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}
.was-validated .form-control:valid:focus, .form-control.is-valid:focus {
border-color: #28a745;
box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
}
.was-validated .form-control:valid ~ .valid-feedback,
.was-validated .form-control:valid ~ .valid-tooltip, .form-control.is-valid ~ .valid-feedback,
.form-control.is-valid ~ .valid-tooltip {
display: block;
}
.was-validated textarea.form-control:valid, textarea.form-control.is-valid {
padding-right: calc(1.5em + 0.75rem);
background-position: top calc(0.375em + 0.1875rem) right calc(0.375em + 0.1875rem);
}
.was-validated .form-select:valid, .form-select.is-valid {
border-color: #28a745;
padding-right: calc((1em + 0.75rem) * 3 / 4 + 1.75rem);
background: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e") no-repeat right 0.75rem center/16px 12px, url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%2328a745' d='M2.3 6.73L.6 4.53c-.4-1.04.46-1.4 1.1-.8l1.1 1.4 3.4-3.8c.6-.63 1.6-.27 1.2.7l-4 4.6c-.43.5-.8.4-1.1.1z'/%3e%3c/svg%3e") #fff no-repeat center right 1.75rem/calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}
.was-validated .form-select:valid:focus, .form-select.is-valid:focus {
border-color: #28a745;
box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
}
.was-validated .form-select:valid ~ .valid-feedback,
.was-validated .form-select:valid ~ .valid-tooltip, .form-select.is-valid ~ .valid-feedback,
.form-select.is-valid ~ .valid-tooltip {
display: block;
}
.was-validated .form-control-file:valid ~ .valid-feedback,
.was-validated .form-control-file:valid ~ .valid-tooltip, .form-control-file.is-valid ~ .valid-feedback,
.form-control-file.is-valid ~ .valid-tooltip {
display: block;
}
.was-validated .form-check-input:valid, .form-check-input.is-valid {
border-color: #28a745;
}
.was-validated .form-check-input:valid:checked, .form-check-input.is-valid:checked {
background-color: #34ce57;
}
.was-validated .form-check-input:valid:focus, .form-check-input.is-valid:focus {
box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
}
.was-validated .form-check-input:valid ~ .form-check-label, .form-check-input.is-valid ~ .form-check-label {
color: #28a745;
}
.was-validated .form-check-input:valid ~ .valid-feedback,
.was-validated .form-check-input:valid ~ .valid-tooltip, .form-check-input.is-valid ~ .valid-feedback,
.form-check-input.is-valid ~ .valid-tooltip {
display: block;
}
.form-check-inline .form-check-input ~ .valid-feedback {
margin-left: .5em;
}
.was-validated .form-file-input:valid ~ .form-file-label, .form-file-input.is-valid ~ .form-file-label {
border-color: #28a745;
}
.was-validated .form-file-input:valid ~ .valid-feedback,
.was-validated .form-file-input:valid ~ .valid-tooltip, .form-file-input.is-valid ~ .valid-feedback,
.form-file-input.is-valid ~ .valid-tooltip {
display: block;
}
.was-validated .form-file-input:valid:focus ~ .form-file-label, .form-file-input.is-valid:focus ~ .form-file-label {
border-color: #28a745;
box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
}
.invalid-feedback {
display: none;
width: 100%;
margin-top: 0.25rem;
font-size: 80%;
color: #dc3545;
}
.invalid-tooltip {
position: absolute;
top: 100%;
z-index: 5;
display: none;
max-width: 100%;
padding: 0.25rem 0.5rem;
margin-top: .1rem;
font-size: 0.875rem;
line-height: 1.5;
color: #fff;
background-color: rgba(220, 53, 69, 0.9);
border-radius: 0.25rem;
}
.was-validated .form-control:invalid, .form-control.is-invalid {
border-color: #dc3545;
padding-right: calc(1.5em + 0.75rem);
background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%23dc3545' viewBox='0 0 12 12'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath stroke-linejoin='round' d='M5.8 3.6h.4L6 6.5z'/%3e%3ccircle cx='6' cy='8.2' r='.6' fill='%23dc3545' stroke='none'/%3e%3c/svg%3e");
background-repeat: no-repeat;
background-position: right calc(0.375em + 0.1875rem) center;
background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}
.was-validated .form-control:invalid:focus, .form-control.is-invalid:focus {
border-color: #dc3545;
box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}
.was-validated .form-control:invalid ~ .invalid-feedback,
.was-validated .form-control:invalid ~ .invalid-tooltip, .form-control.is-invalid ~ .invalid-feedback,
.form-control.is-invalid ~ .invalid-tooltip {
display: block;
}
.was-validated textarea.form-control:invalid, textarea.form-control.is-invalid {
padding-right: calc(1.5em + 0.75rem);
background-position: top calc(0.375em + 0.1875rem) right calc(0.375em + 0.1875rem);
}
.was-validated .form-select:invalid, .form-select.is-invalid {
border-color: #dc3545;
padding-right: calc((1em + 0.75rem) * 3 / 4 + 1.75rem);
background: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e") no-repeat right 0.75rem center/16px 12px, url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%23dc3545' viewBox='0 0 12 12'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath stroke-linejoin='round' d='M5.8 3.6h.4L6 6.5z'/%3e%3ccircle cx='6' cy='8.2' r='.6' fill='%23dc3545' stroke='none'/%3e%3c/svg%3e") #fff no-repeat center right 1.75rem/calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}
.was-validated .form-select:invalid:focus, .form-select.is-invalid:focus {
border-color: #dc3545;
box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}
.was-validated .form-select:invalid ~ .invalid-feedback,
.was-validated .form-select:invalid ~ .invalid-tooltip, .form-select.is-invalid ~ .invalid-feedback,
.form-select.is-invalid ~ .invalid-tooltip {
display: block;
}
.was-validated .form-control-file:invalid ~ .invalid-feedback,
.was-validated .form-control-file:invalid ~ .invalid-tooltip, .form-control-file.is-invalid ~ .invalid-feedback,
.form-control-file.is-invalid ~ .invalid-tooltip {
display: block;
}
.was-validated .form-check-input:invalid, .form-check-input.is-invalid {
border-color: #dc3545;
}
.was-validated .form-check-input:invalid:checked, .form-check-input.is-invalid:checked {
background-color: #e4606d;
}
.was-validated .form-check-input:invalid:focus, .form-check-input.is-invalid:focus {
box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}
.was-validated .form-check-input:invalid ~ .form-check-label, .form-check-input.is-invalid ~ .form-check-label {
color: #dc3545;
}
.was-validated .form-check-input:invalid ~ .invalid-feedback,
.was-validated .form-check-input:invalid ~ .invalid-tooltip, .form-check-input.is-invalid ~ .invalid-feedback,
.form-check-input.is-invalid ~ .invalid-tooltip {
display: block;
}
.form-check-inline .form-check-input ~ .invalid-feedback {
margin-left: .5em;
}
.was-validated .form-file-input:invalid ~ .form-file-label, .form-file-input.is-invalid ~ .form-file-label {
border-color: #dc3545;
}
.was-validated .form-file-input:invalid ~ .invalid-feedback,
.was-validated .form-file-input:invalid ~ .invalid-tooltip, .form-file-input.is-invalid ~ .invalid-feedback,
.form-file-input.is-invalid ~ .invalid-tooltip {
display: block;
}
.was-validated .form-file-input:invalid:focus ~ .form-file-label, .form-file-input.is-invalid:focus ~ .form-file-label {
border-color: #dc3545;
box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}
</style>
</head>
<body>
<form class="needs-validation" novalidate>
<div class="input-group">
<label for="username">Username</label>
<input type="text" class="form-control" id="username" placeholder="Username" required>
<div class="invalid-feedback">
Username is required.
</div>
</div>
<div class="input-group">
<button type="submit">Submit</button>
</div>
</form>
<script type="text/javascript">
// 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
);
})();
</script>
</body>
</html>