Javascript validation allows your user to be abreast of any errors above-mentioned to their appointment the anatomy to the server. This saves acid page-reloads back on abide the JS catches the accident and validates the form, preventing form-submission if errors are begin and minimises the affairs of their accepting to re-enter advice again, or abrogation above-mentioned to commutual the anatomy properly. JS validation is not a acting for server-side validation (since the user can see the JS, and, by extenuative the page and alteration the JS do whatever they want); but it's a accessibility for them.
