How to determine if variable is 'undefined' or 'null'

Posted by sadmicrowave on Stack Overflow See other posts from Stack Overflow or by sadmicrowave
Published on 2010-04-15T18:12:16Z Indexed on 2010/04/15 18:13 UTC
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How do I determine if variable is 'undefined' or 'null'. My code is as follows:

 EmpName = $("div#esd-names div#name").attr('class');
 if(EmpName == 'undefined'){
///DO SOMETHING/////
 };

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