Labels for plotly.js sliders, buttons, and dropdowns

[jackparmer]

I've been making a lot of charts lately with sliders, buttons and dropdowns in Python and R. The updatemenu API is really nice and flexible.

It's a little finicky adding annotations as labels for these controls. I do a lot of placement trial-and-error with the Python and R reference pages open. It would be nice if labels were built into the JSON spec for updatemenu components.

Here is a nice mock of how this could look:

Seems like some of this text positioning might have already been worked out for sliders through layout.sliders.currentvalue.prefix:

https://plot.ly/javascript/reference/#layout-sliders-currentvalue-prefix

[gvwilson]

Hi - this issue has been sitting for a while, so as part of our effort to tidy up our public repositories I'm going to close it. If it's still a concern, we'd be grateful if you could open a new issue (with a short reproducible example if appropriate) so that we can add it to our stack. Cheers - @gvwilson