Can I turn altair axis titles into links?

In altair, possible to turn the axis titles into links?

(I understand how to use href for points, but not sure if I can do something similar for axis labels.)

Solution

I don't think it is possible to format axis title like that and don't see any property in the Vega-Lite docs that suggest you can. However, you could place a text mark strategically to receive the same result:

import altair as alt
from vega_datasets import data

cars = data.cars()
chart = alt.Chart(cars).mark_circle().encode(
        x=alt.X('Miles_per_Gallon', title=''),
        y='Weight_in_lbs',
        color='Origin'
)

text = alt.Chart().mark_text(
    align="center",
    baseline="top",
    fontSize=11,
    fontWeight=600,
    color='#007bff',
    href='https://stackoverflow.com'
).encode(
    x=alt.value(200),  # pixels from left
    y=alt.value(322),  # pixels from top
    text=alt.value("Miles_per_Gallon")
)

text + chart