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How would I add an attribute to an element if that element does not already have that attribute?
if (' this does not have class=selected') {
$(this).addClass('selected');
}
If you’re talking specifically about classes, then just go ahead and add it. If it already exists, it won’t be added twice.
I doubt that first testing for the class would be any more efficient.
live demo: http://jsfiddle.net/2sLd5/