Display height in bokeh vbar tooltip

问题

I want to make a bar chart of some simple data, e.g. a pandas dataframe like this.

Cats 4
Dogs 3
Mice 27

I would like a tooltip which displays something like this when hovering over a bar:

Name: Cats
Count: 4

With a bar chart, this worked with

hover.tooltips = [
('Name', ' $x'),
('Count', ' @height'),
]

I since switched to vbars. What would be the corresponding keyword for @height? Or does it generally not work this way with vbars/hbars?

回答1:

I figured it out. I could make an extra ColumnDataSource like this:

hover_help = ColumnDataSource(dict(
    count=[value for value in animals["No"]]
))

which yields a list of values for animals. This can then be used for the vbar like this:

p.vbar(source=hover_help, bottom=0, x=animal_names, top=animals['No'], color='#18286b', legend=False, **bar_opts)

Even if the source is not used as a data source, it can now be used for the tooltip:

hover.tooltips = [
    ('Name', ' $x'),
    ('Count', ' @count'),
]

来源：https://stackoverflow.com/questions/42402718/display-height-in-bokeh-vbar-tooltip