$( document ).ready( function() { $( "#personForm:firstname" ).addClass( "required" ); });
<form id="personForm" name="personForm" method="post" action="/Demo/jsf/main.jsf;jsessionid=0596FB948C236D0FFC16227FC10A0C23" enctype="application/x-www-form-urlencoded"> <div class="field"> <label>Last Name</label> <input id="personForm:lastname" name="personForm:lastname" type="text" value="" /> </div> <div class="field"> <label>First Name</label> <input id="personForm:firstname" name="personForm:firstname" type="text" value="" /> </div> <div class="field"> <label>Address</label> <input id="personForm:address" name="personForm:address" type="text" value="" /> </div> <!-- ... more HTML ... --> </form>