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Validation and Submission of form using jQuery :: Easiest Solution

In any application, form validation and submission to server is so common and redundant; there are multiple ways of doing it. And the best and easiest way that I do use or recommend is jQuery solution.  Most popular jQuery plugins are the best solution, they have the best solution ever.  One, jQuery Validator written and maintained by Jorn Zaefferer, a member of the jQuery team, lead developer on the jQuery UI team and maintainer of QUnit. Two, jQuery Form by malsup, it has various plugins and solutions. Another plugin that I like from same developer is jQuery BlockUI . (give a try). Name: Email: Note: To avoid unexpected behavior, maintain same form and fields names and id selector values. Need further explanation, let me know.
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Email already exists using jQuery

It is the common requirement for any web application either it is PHP, .net, JSP etc., which has users involved. When creating/adding user from admin or end user registration we should check whether username or email address already exists. It will help to have unique registrations to our application and avoid confusion between various users.  I see many developers struggle with this by submitting the form to server side script and validate their from database, in case username/email address already exists they take the pain to go back to previous page or form and show the error message with other form data filled.  Few use AJAX to send the information onblur or onkeyup or onkeydown but face difficulties to stop form submission. Here is the simple solution that would help in validating username or email address existence without much hassle.  Solution comes from popular jQuery Validator plugin I'm using this from ages.  HTML Code: <html> <head...
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