(x|y)hoverformat

[nicolaskruchten]

All traces that support (x|y)period should also support (x|y)hoverformat which is the formatting that will be applied to the x or y value when it appears in any hoverlabel: unified, compare (both point and axis, thereby overriding (x|y)axis.hoverformat) and closest.

[archmoj]

It looks we shouldn't apply this format on date axes.
What are the other cases?

[archmoj]

Also to mention the zhoverformat is used in heatmap and contour for numbers and dates:

plotly.js/src/traces/heatmap/attributes.js

Lines 114 to 123 in 623fcd1

	zhoverformat: {
	valType: 'string',
	dflt: '',
	editType: 'none',
	description: [
	'Sets the hover text formatting rule using d3 formatting mini-languages',
	'which are very similar to those in Python. See:',
	FORMAT_LINK
	].join(' ')
	},

[archmoj]

It looks we shouldn't apply this format on date axes.
What are the other cases?

Nevermind. That will works for date axes.

[nicolaskruchten]

Yes, date axes are most of the reason for this, so it will work with periods :)

[archmoj]

In addition to traces covered by #5563, it is possible to add this option for heatmapgl, as well as gl3d traces.

[nicolaskruchten]

We can add it to these other traces if it doesn't take more than a combined total of an hour :)

[jxu]

Is this what changed in v2.0.0 the marker text in scatterplot to show (x,y) instead of just y?

[nicolaskruchten]

In v2 we did change the default hover mode from "x" to "closest" yes. The feature described in this issue works with all hover modes.

[archmoj]

Is this what changed in v2.0.0 the marker text in scatterplot to show (x,y) instead of just y?

@jxu No please see #5647. Alternatively you can set hovermode: 'x' with v2.