Change in behavior for selectbox in v1.34.0

Using Streamlit
1

Hi,

v1.34.0 changes the behavior of the selectbox widget. Here is our widget:

st.selectbox(
    "QUERY",
    key=query_selection_key,
    options=st.session_state[query_select_options_key],
    help=st.session_state.q_select_tooltip,
    index=st.session_state[query_selection_index_key],
    on_change=self._callbacks.q_selection_changed,
)

In our app, we use the index argument to set the initial state. We have verified it works on all versions pre-v1.34.0. Here is how the widget lookson v1.34.0, when the index argument is set to 0.

image

Here are the v1.34.0 widget variables state:

(Pdb) st.session_state[query_selection_key]
(Pdb) st.session_state[query_selection_index_key]
0
(Pdb) st.session_state[query_select_options_key]
['WS1_BinData']

Here is v1.33.0:

(Pdb) st.session_state[query_selection_key]
'WS1_BinData'
(Pdb) st.session_state[query_selection_index_key]
0
(Pdb) st.session_state[query_select_options_key]
['WS1_BinData']

On v1.34.0 the selectbox session state value is None, on v1.33.0 it is set to ‘WS1_BinData’. I don’t see any changes in the v1.34.0 release notes that look to be the cause. Looks like an escape in your unit testing or an undocumented change in behavior.

thx

2

Cannot reproduce.

Screenshot 2024-05-09 at 15-25-19 test · Streamlit

3

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