Streamlit's display of an Altair chart interferes with axis labels

[ryanlampkin]

I first posted my issue here on stackoverflow. I thought it was an altair / vega-lite issue. Now I believe it is a streamlit / altair issue. I've reproduced my analysis below.

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I started with this reference point: vega/altair#1576.

For which I was able to display the x-axis label like so:

I'm using ordinal axis formatting in Altair to display dates (in order to skip weekend dates). I'm dynamically selecting valid dates within the dataframe's index, and yet, there are values that are not displaying on the chart.

It's not just these two missing values... certain dates just don't want to display (like "Jan 29, 2021", for which both prior and subsequent valid dates display fine).

Any ideas why these dates aren't showing up? Is this a datetime parsing issue? Even if I explicitly set a value (that works b/w streamlit and vega-lite) such as "Jan 29, 2021", it still won't display when calling the chart through Streamlit.

I cannot reproduce the error when I circumvent Streamlit, but when I chart through Streamlit, it appears Streamlit is reconfiguring the axis for display.

[willhuang1997]

Hi @ryanlampkin , thanks for submitting this. Could you possibly give a code snippet so I can run and reproduce locally? If I am able to reproduce locally, I would be able to debug much more easily what is going on.

[jrieke]

Closing since we changed the design of Altair charts a while back (which probably affects this issue) and there is no reproducible code example.