I just checked in a basic prototype which meets all my needs[*]. Feel free to include/modify as you see fit!
I'm attaching an html file which creates an example box plot using the jqplot.boxplotRenderer.js linked to above.
[*] Actually, the one thing I've not yet been able to figure out is how to get the highlight tooltip to appear when mousing over any part of a diagram (inside the box, over a whisker, etc). Currently it only appears when mousing over the min point. It looks like the candlestick plot is able to achieve this, but I haven't yet figured out how. Any help would be much appreciated!
I am trying to use the prototype of the box plot. The y axis bounds are not being correct. It looks like the bounds are being set as if the plot is a line plot and indexing into data that is just [x,y].
The box plot prototype was written a couple of years ago and I am trying to use on the most recent release of jqplot.
I had the same issue when I started with a copy of the ohlc renderer code and just changed the names of the class.