Streamlit v1.3.0 I only want the file_uploader to run the callback function when I remove any file or upload any new file to the file_uploader widget. But now I’m having this issue where it keeps calling the ‘on_change’ callback function even though I didn’t remove or upload any file. The way to tr…

I settled with a workaround by performing all the necessary callbacks within the if video_file is None statement. This works well for accepting a single upload but probably not multiple files. if video_file is None: logger.info("Resetting states for uploaded video") # reset and remove the T…

Hi, I am having the same issue. I’ve created a demo app to replicate the issue so that it can hopefully be addressed sooner. import streamlit as st def uploader_callback(): print('Uploaded file') st.file_uploader( label='File uploader', on_change=uploader_callback, key='file_uploa…

Streamlit, version 1.7.0 I also tried the on_change callback of the st.file_uploader widget and found that the callback function is called twice for each upload, except for the very first time. Is this intentional?

Same problem on Streamlit version 1.8.1

facing the same issue here, anyone solved it yet?

Hi all :wave: I was able to reproduce this bug with Streamlit v1.10.0 and have submitted a bug report: `st.file_uploader` callback is called twice on each upload, after the first upload opened 05:32AM - 20 Jun 22 UTC (UTC) …

Thank you, would you recommend any workaround for the mean time as I have an ML App that is currently running.

@nick_muchi My understanding of this behavior is that each subsequent upload also clears the existing upload. Clearing the existing upload triggers the callback, too. For each new upload, the callback is called when the existing upload is cleared AND when the new file is uploaded. A workaround is t…

And this issue is still present. Its a critical bug considering how efficient on_change functionality is to the widget uses.

St.file_uploader keeps calling the callback function passed into the 'on_change' parameter on every other widget change

Using Streamlit

nick_muchi June 20, 2022, 6:59am 10

Thanks for your help, I think my issue is a bit different but related to the file_uploader callback, hope you can assist on that if you have time. I tried but could not come up with a workaround.

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St.file_uploader keeps calling the callback function passed into the 'on_change' parameter on every other widget change

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