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Clarify that a special field name is required to render images in tooltips #2570

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merged 1 commit into from Oct 29, 2022
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Clarify that a special field name is required to render images in tooltips #2570

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6 changes: 4 additions & 2 deletions altair/examples/image_tooltip.py
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Expand Up @@ -3,7 +3,9 @@
-------------
This example shows how to render images in tooltips.
Either URLs or local file paths can be used to reference
the images.
the images. To render the image, you must use the special
column name "image" in your data and pass it as a list to
the tooltip encoding.
"""
# category: other charts

Expand All @@ -17,5 +19,5 @@
alt.Chart(source).mark_circle(size=200).encode(
x='a',
y='b',
tooltip=['image'] # Must be a list for the image to render
tooltip=['image'] # Must be a list containing a field called "image"
)