title: jQuery validate rule ONLY AT SUBMIT
body: <p>Say i have a form that looks up city, state locations.  if the user enters an incorrect city, state, i want the form to be able to check the database against the users input, and see if the input is valid or not.  If it is not, i want the user to be prompt.  </p>
  
  <p>So form Validate is the plugin for me.</p>
  
  <pre><code>$("#form").validate({
      rules: {
         citystate: {
             required: true,
             myCustomAjaxSyncronousCheckAgainstDBRule: true
         }
  
      submitHandler: function(form) {
          if ($("#form").valid()) {
              form.submit();
          }
      }
  });
  </code></pre>
  
  <p>Now say this form has to be used in 4 different places in my website, so it would suck to refactor out the myCustomAjaxSyncronousCheckAgainsDBRule (Fake name btw) and have the same code 4 times throughout my website.  So that is why i created a custom rule in the JS file.  But is there a way that the rule CAN ONLY be checked at Submit time.  Since if there is an invalid user input, it will check it at EVERY key stroke, which can be quite cumbersome.  Especially since i have jQuery.ui.autocomplete running inconjuction.</p>