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I am working on Salesforce platform and we are using jquery. I am not sure how can I test the code on jsfiddle. I can provide you simple apex code for testing.

<apex:page standardController="TISL_Script__c" extensions="TISLNewScriptController" id="thePage">

<apex:includeScript value="https://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.js"/>

<apex:includescript value="http://ajax.microsoft.com/ajax/jquery.validate/1.9/jquery.validate.min.js"></apex:includescript>

<script type="text/javascript">

//Rules

$(document).ready(function(){

$(".sendButton").click(function() {

$('[id$=submitForm]').validate();

$('[id$=firstname]').rules("add",{

required: true

});

});

});

</script>

<FORM action="" method="post" id="submitForm">

<P>

<LABEL for="firstname">First name: </LABEL>

<INPUT type="text" id="firstname"/><BR/>

<LABEL for="lastname">Last name: </LABEL>

<INPUT type="text" id="lastname"/><BR/>

<INPUT type="submit" value="Send" class="sendButton" />

</P>

</FORM>

</apex:page>

Thanks

Ajay

You can make that work by just including a reduced version of the markup and the offending JS. If it can't be reproduced, then it's not a bug in jQuery

When I reduce it and move the actual rule setting outside of the submission handler, it works fine. http://jsfiddle.net/rwaldron/RFtb7/

The code above isn't even adding the rule until after the first click.

Thanks. Let me test it.