Where is located the “needs-validation” class in Bootstrap 5?

Question

It‘s a class used in the form component. One extract here: <form class="row g-3 needs-validation" novalidate> I don‘t put more because that snippet is enough to say that “needs validation” is a class that should be defined in the “bootstrap.css” file, which is the most complete, but nothing.

I used the cmd+F to search “.needs-validation” (withor without the prepend dot), in the open files of: bootstrap.css, bootstrap.js and bootstrap.bundle.js, but nothing. Or is it on the server somehow? From where is called that “needs-validation” class

Answer 1

You probably got this class from one of the examples in the docs. In these, the class .needs-validation is more used as a "semantic" helper-class. Since the browser-default form-validation is disabled in the examples, this class can be used as a way to easily select all the forms where a custom form-validation needs to be executed and where Bootstrap validation styles should be applied to.

The class .needs-validation is not part of Bootrap 5 and does not add any styles.