Hi there,
Glad to hear you got it working. As Henry suggested, there's nothing
like a "point" to hang an onclick handler off -- you basically need to
figure out where the mouse was based on using the invert() function of
the relevant scale.
Without being able to see your code, my guess would be that you're
adding a new path when you're updating the graph, rather than updating
the existing path. You could solve that by deleting the existing one,
but probably a more pleasant experience for the user would be just to
update the existing one. (i.e. replace the "d" attribute of the path
with your newly rendered data.)
Here's a handy (and new!) tutorial:
http://www.jeromecukier.net/blog/2013/03/05/d3-tutorial-at-strata-redux/
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