You did try to structure your question very well. good. However, I don't see any of the screenshots nor a link to them. It is therefore very, very difficult to follow your text in making some sense.
However, I assume your talking about this JQPlot
In that case I happen to know a tid or tad of JQPlot. I have never done what you're trying to achieve, but this is what you can do:
- You can highlight a serie or point via hovering, right? this is done by sending an "onhover" event to the plot.
1. Try to find out if you can control the "highlight" code, by sending an event (not likely, but it is the best solution)
2. Try to let the JQPlot think you're hovering over that specific series. (not ideal, but it should work)
3. Modify the JQPlot code to allow you to highlight the series. (Not recommended. Try to touch as little code as possible.)
I would start out with a pure HTML testpage that has one plot with 2 series and try to hardcode the highlight. (first by using the standard onhover feature and then trying to go around the onhover by using eg a button click)
It is not an easy feature you're trying to do here, I doubt you'll get a ready answer. Take some time to figure this out and do some tests.
best of luck.