I made an extremely simple jsFiddle to show the issue.

http://jsfiddle.net/Michael_0/qfbwgmca/

Edit : http://jsfiddle.net/Michael_0/qfbwgmca/1/

The sample does not run (external dynatree lib is not loaded. Anyway: the callback passed to visitParents receives the visited node. So it should be

node.visitParents(function (parentNode) { console.log("visitParents : " + parentNode.data.title); }, false);

Comment deleted

You are right, I forgot the callback's argument. Thank you.