Fix scattergl animation index out of range in for loop - #7676
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camdecoster merged 7 commits intoJan 16, 2026
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Thanks for the PR! Before we review, could you please provide some videos showing the change? |
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src/traces/scattergl/plot.js
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Co-authored-by: Cameron DeCoster <cameron.decoster@gmail.com>
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January 15, 2026 03:37
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Thanks for the review @camdecoster ! |
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Goal: Fix runtime error when "animating" scattergl traces. I don't believe scattergl traces actually support animations like easing and redraw=False, but they should at least not hit a runtime error.
As shown in #6251 , there is an unsafe index into cdata with variable i because variable i comes from scene.count and not cdata.length. This is normally fine. However, during frame redraw animations, we may call scattergl.plot with a subset of calcdata, so cdata.length can be < scene.count.
Further up in traces/scattergl/plot.py there was already an instance of checking if cdata[i] is undefined, so I've mirrored that into the for loop.
Fixes #6251.
This should also fix #6897 which is the same error as #6251.