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$('#'+id).attr('checked'), which is equivalent to$('#' + id).is(":checked")but easier to remember IMO..attr('checked'). Its behavior changed in jQuery 1.6. It used to returnfalseortrue. Now it returnsundefinedor"checked"..is(':checked')does not have this problem.$('.ClassName').is(':checked')doesn't seem to work but$('#' + id).is(":checked")does? aside from the fact that one looks up by id and one by classname.