Click anywhere on chart, not just data items

I’m trying to implement a feature where the user can click anywhere on the chart to add kind of annotations, however C3 only recognises click events on data points. Setting data.selection.grouped = true as suggested elsewhere makes it partly work, however the onclick event callback is then called once per data item, and still only works for the data items themselves.

What i’m after is a way of recognising a click anywhere, so I am then able to calculate what the X value should be based on the x-axis’ scale and use it elsewhere. Is there any way I can do this?

[pareeohnos]

Ah so it does! Initially this wasn’t working as I expected, calling chart.internal.x(xCoord) returned -2031062 but calling chart.internal.x.invert(xCoord) instead works as expected 😃 Thanks for all the help

[Hypersapien]

I’m using this method on a Stacked Area Graph, and I got it working. I can tell which X-axis value is being clicked on, but I don’t know how to tell which vertical area of the graph is being clicked on.