I would like to know about the available js libraries for drawing multi-level trees. Some functions that I would like to add to the created tree are to make nodes accessible by click and be able to select an area on the graph and perform actions based on the selection.
Maybe you should try arbor.js?
I would watch Protovis . I had a good success. Nevertheless, this is a very general library, providing you with many building blocks for creating good schedules, but it will not be a turnkey solution.