Login validation

We notify users when their username or email address is already in use. This is done with a green checkbox or red 'x' along with a message through an AJAX request. If you're not seeing this, please ensure that there are no Javascript errors on your page, or feel free to post your URL so that we can see the login/registration page and see if we can diagnose the problem.

As for Joomla itself, no, it does not have a built in name checker at the time of filling in the form. It will, however, notify the user after they try to click "Register" and the page reloads if it is in use. 3rd party components like CB, JomSocial, or other components all can do their own thing.

Let us know what you find.

You should get a "Username and password do not match or you do not have an account yet." system message. You can see this message on this site, or our demo site sourcecoast.com/jfbconnect/demo Just try typing anything into the boxes and hit submit.

If you're not seeing system messages, you're template may not be setup correctly. Try, temporarily, enabling the default Milkway template and see if you see the messages then. If so, you should contact your template provider about the issue.

The system message bit is just how Joomla does it. If you're looking for more of a pop-up way to show system messages, the below post might help you out. I haven't used or tested this, but the guys that did it are great, so I'm pretty confident it works as advertised (and it's free).
zunostudios.com/blog/125-joomla-modal-system-messages

Good luck, and glad we could help answer your question!

Fantastic. Glad we could help, and that you found what you needed. If you have any other questions, you know where to find us!