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Bootstrap/site/static/docs/5.3/assets/js/validate-forms.js

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