When I make a plot with a hover tool for several layers, I would like to change the tooltip in the toolbar from the default “Hover” to a custom label when I hover over the hovertool itself in the toolbar. Is that possible?
Example plot:
http://ebd-covid19.s3-website-us-east-1.amazonaws.com/#Confirmed_Cases_Country_Comparison
I believe if you create a bokeh HoverTool instance that will support a custom description: HoverTool(description='ABC', tooltip=[...]), e.g.:
hover = HoverTool(description='Custom Tooltip', tooltips=[('x', '@x'), ('y', '@y')])
hv.Points([(0, 0), (1, 1)]).opts(tools=[hover], size=10)
Thanks @philippjfr, this sounds good. I however get an error that description is an unexpected attribute in HoverTools. Could it be a version issue? Here is my attempt:
import holoviews as hv
from bokeh.models import HoverTool
hv.extension('bokeh')
hover = HoverTool(description='Custom Tooltip', tooltips=[('x', '@x'), ('y', '@y')])
hv.Points([(0, 0), (1, 1)]).opts(tools=[hover], size=10)
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-2-afc1058f0e25> in <module>
----> 1 hover = HoverTool(description='Custom Tooltip', tooltips=[('x', '@x'), ('y', '@y')])
2 hv.Points([(0, 0), (1, 1)]).opts(tools=[hover], size=10)
/home/conda/store/205cb5b9b1c0c2c2d9f3a4e3a712117290aeaaebd2fc5b42b587de7d9552b398-pangeo/lib/python3.8/site-packages/bokeh/model.py in __init__(self, **kwargs)
233 kwargs.pop("id", None)
234
--> 235 super().__init__(**kwargs)
236 default_theme.apply_to_model(self)
237
/home/conda/store/205cb5b9b1c0c2c2d9f3a4e3a712117290aeaaebd2fc5b42b587de7d9552b398-pangeo/lib/python3.8/site-packages/bokeh/core/has_props.py in __init__(self, **properties)
247
248 for name, value in properties.items():
--> 249 setattr(self, name, value)
250
251 self._initialized = True
/home/conda/store/205cb5b9b1c0c2c2d9f3a4e3a712117290aeaaebd2fc5b42b587de7d9552b398-pangeo/lib/python3.8/site-packages/bokeh/core/has_props.py in __setattr__(self, name, value)
283 matches, text = props, "possible"
284
--> 285 raise AttributeError("unexpected attribute '%s' to %s, %s attributes are %s" %
286 (name, self.__class__.__name__, text, nice_join(matches)))
287
AttributeError: unexpected attribute 'description' to HoverTool, possible attributes are anchor, attachment, callback, formatters, js_event_callbacks, js_property_callbacks, line_policy, mode, muted_policy, name, names, point_policy, renderers, show_arrow, subscribed_events, tags, toggleable or tooltips
bokeh version:
bokeh 2.2.3 py38h578d9bd_0 conda-forge
holoviews version:
holoviews 1.14.1 pyhd3deb0d_0 conda-forge
Sorry about that. Seems like that was only merged into Bokeh as part of the 2.3 branch which isn’t due to be released until some time this week. Will ping you when that and a compatible HoloViews and panel release are available.