An important feature which I missed out in versions 1.0 and 1.1 has been added in this version. It is a callback option which can help make AJAX callbacks or any other callbacks when the form is successfully validated.

Now we can make callbacks on successful validation.
In this example I am making an AJAX post to post.php when the form is successfully validated. For this we just need to add the following to the head section of our HTML file

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js" type="text/javascript"></script>
<script src="javascripts/jquery.validate.js" type="text/javascript"></script>
<script type="text/javascript">
            jQuery(function(){
                //The Validation as earlier
                jQuery("#<id of field to be validated>").validate({
                    expression: "if (<expression for validation>) return true; else return false;",
                    message: "<message on validation failure>"
                });
                //The callback for the form with ID FormID
                jQuery("#FormID").validated(function(){
                   jQuery.post("post.php", jQuery("#FormID").serialize(), function(data){ jQuery("#FormID").html(data); });
                });
            });
</script>

I have updated the advanced demo with an alert callback.

Advanced Demo: Click Here
Download: Click Here
Project Repository: Click Here

Hope this feature helps. And many thanks to Vayu for pointing out this important feature.

1. Validations of radio-buttons and check-boxes now possible
2. Added jquery.validation.functions.js to modularize addition of new validation functions.
3. New validation functions added
   1. isValidDate(year, month, day): It takes in three parameters the year(i.e. full year) of the date, the month of the date and the day part of the date and returns false if its not a valid date and true if valid. It includes checking of leap years. For example: 02-29-2008 will show as valid but 02-29-2009 as invalid.
   2. isChecked(id): It takes the id of the container containing the group of check-boxes or radio-buttons and returns false if none of the children were checked and true if at-least one was checked.

Advanced Demo: Click Here
Download: Click Here
Project Repository: Click Here