How to set up HoverTool for multiple columns with hvPlot?

hvPlot
,
4

The trick is to use ‘value’ in the tooltip:

import hvplot.pandas
import numpy as np
import pandas as pd

index = pd.date_range("2020-07-01", "2021-07-01", freq="D")
data = np.random.random((index.size, 4)) + 10 * np.arange(4)[np.newaxis, :]
df = pd.DataFrame(data, index=index, columns=list("ABCD"))

# Using custom models
from bokeh.models import DatetimeTickFormatter, HoverTool

# https://docs.bokeh.org/en/2.4.1/docs/reference/models/formatters.html#datetimetickformatter
tickfmt = DatetimeTickFormatter(years="%m-%d", months="%m-%d")

tooltips = [
    ("Month-Day", "@index{%m-%d}"),
    ("value", "@value"),
    ("name", "@Variable")
]
hover = HoverTool(tooltips=tooltips, formatters={"@index": "datetime"})

df.hvplot(xformatter=tickfmt, tools=[hover])

Screenshot 2022-09-26 09.32.28

3 Likes