Hoverformat fails to apply when showticklabels=False

[yankev]

This is in reference to the following issue in the Plotly Python API:
Issue 398

Unless showticklabels = True then the hoverformat is not applied.
For example in the following code:

from plotly.graph_objs import Scatter, Layout, YAxis, Figure
import plotly.plotly as py

data = [Scatter(x=[1, 2, 3],
                 y=[0.12345, 0.23456, 0.34567])]
layout = Layout(yaxis=YAxis(showticklabels=False,
                            hoverformat=",.2r",))
figure = Figure(data=data, layout=layout)
py.iplot(figure)

Plot generated from the code

The associated yaxis portion of the json is

yaxis:{
  hoverformat:",.2r",
  showticklabels:false,
  type:"linear",
  range:[
             -0.2711700793681046,
              0.7894967832778617
             ],
  autorange:false
}

and so it appears to have translated correctly from the python plot function call.

[mdtusz]

Confirmed (unless @etpinard knows some reason why not). Thanks for reporting it.

Aside: For markdown links, the structure is name of link. Looks like you may have gotten it mixed up 😉

[etpinard]

@yankev even better: use this template to show the bug in a codepen

[yankev]

@mdtusz Haha yeah.
@etpinard Oh ok, I'll just adjust the link to the one you made this time.

[etpinard]

Here's the problematic block: https://github.com/plotly/plotly.js/blob/master/src/plots/cartesian/tick_defaults.js#L33-L54

We only coerce hoverformat when showticklabels is true --- which is a little too crude.

Arguably, the logic for tickprefix and ticksuffix is wrong too. We should coerce them even in the case where showticklabels is false.