St.multiselect not populating with selection after callback

Using Streamlit
1

Hi all, running into some issues where st.multiselect is not populating selected values on click. The st.multiselect has a callback function that updates a dataframe (which feeds the multiselect options dropdown - this may be the issue here). Any idea how to retain the selected values upon selection, while still updating the multiselect options?

2

Can you show a demo code ?

3

I am having a very similar issue. In my case I was using the multiselect widget within a “st.form”. In this case effectively the selected values do NOT get updated. Now if you implement the multiselect out of any “st.form” ,then it works. I do not know why. I was just trying to investigate that.

For a better clarification see the pictures below:
1- Outside any st.form:
out_of_form

2- Inside any st.form:
within_a_form

I hope that helps or hopefully someone else knows better? Txs

4

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