I had a vbar_stack plot. The plot was written originally in Bokeh 3.6.
We could hover the bar and a tooltip was displayed with the numeric value of the bar. See attached file Bokeh_3.6_barchart_tooltip_success.png
I have updated my system with Bokeh 3.8 and the numeric value on the tooltip is replaced with the string “@name of the bar”. See attached file Bokeh_3.8_barchart_tooltip_error.png
Below is a minimal reproducible example to observe the above behaviour:
from bokeh.plotting import figure, show
from bokeh.models import HoverTool
from bokeh.models import ColumnDataSource
from bokeh.palettes import TolRainbow
stages = ['Stage1', 'Stage2', 'Stage3']
costs = ['cFix', 'cVar', 'cFuel', 'cNSE', 'cStart', 'cUnmetRsv', 'cNetworkExp', 'cUnmetPolicyPenalty', 'cCO2']
data = {
'cFix': [1383746169.2278163, 884296586.3347533, 284149474.8879363, 215300108.00512677],
'cVar': [44611648.62465662, 33572367.644309215, 7743604.844316075, 3295676.136031328],
'cFuel': [85095286.72358733, 65296581.45350175, 18075138.22088323, 1723567.0492023495],
'cNSE': [12.333818866721018, 1.9328193280526111, 2.5462439425594803, 7.854755596108927],
'cStart': [6640245.009495095, 4359184.440677883, 1900959.92808766, 380100.640729552],
'cUnmetRsv': [0.0, 0.0, 0.0, 0.0],
'cNetworkExp': [18.71842377159223, 11.785378296213011, 0.9945214063612848, 5.938524069017936],
'cUnmetPolicyPenalty': [0.0, 0.0, 0.0, 0.0],
'cCO2': [0.0, 0.0, 0.0, 0.0],
'index': ['Overall', 'Stage1', 'Stage2', 'Stage3'],
'stages': ['Overall', 'Stage1', 'Stage2', 'Stage3']
}
source = ColumnDataSource(data)
p1 = figure(
x_range=['Overall'] + stages,
height=500,
width=2000,
)
p1.title.text = 'Overall costs'
p1.outline_line_color = None
p1.y_range.start = 0
p1.x_range.range_padding = 0.1
p1.xgrid.grid_line_color = None
p1.axis.minor_tick_line_color = None
p1.yaxis.axis_label = '$'
p1.yaxis.axis_label_text_font_style= 'bold'
p1.xaxis.axis_label = 'Stages'
p1.xaxis.axis_label_text_font_style= 'bold'
renderers = p1.vbar_stack(
costs,
x='stages',
width=0.9,
color=TolRainbow[max(min(TolRainbow),len(costs))],
source=source,
legend_label=costs
)
hover_tool = HoverTool(
tooltips='<style>' \
'.bk-tooltip>div:not(:first-child) {display:none;}' \
'</style>' \
'Stage: <b>@stages{safe}</b> <br>' \
'$name cost: <b>@$name</b> <br>',
renderers=renderers
)
p1.add_tools(hover_tool)
show(p1)