Multiselect to affect other multiselect bidirectional

Using Streamlit
, ,
1

Hi I trying to create a bidirectional multiselect
eg: I have include cities and exclude cities dropdown I need to update the list of include and exclude cities based on the selection. I’m using session state to achieve it
in the below code cities is a dictionary I maintain of my list of cities

with st.container():
        if 'include_cities' not in st.session_state:
            st.session_state.include_cities = []
        if 'exclude_cities' not in st.session_state:
            st.session_state.exclude_cities = []
        def get_available_cities(cities_include, cities_exclude):
            return {
                    "include": [city for city in cities if city not in cities_exclude],
                    "exclude": [city for city in cities if city not in cities_include]
            }
        def update_cities():
            if 'include_multiselect_c' in st.session_state:
                st.session_state.include_cities = st.session_state.include_multiselect_c
            if 'exclude_multiselect_c' in st.session_state:
                st.session_state.exclude_cities = st.session_state.exclude_multiselect_c

        available_cities = get_available_cities(st.session_state.include_cities, st.session_state.exclude_cities)

        include_treatment_c = st.multiselect("**INCLUDE:**", options=available_cities['include'],default=st.session_state.include_cities,key='include_multiselect_c', on_change=update_cities() )
                    
        exclude_treatment_c = st.multiselect("**EXCLUDE:**", options=available_cities['exclude'],default=st.session_state.exclude_cities, key='exclude_multiselect_c', on_change=update_cities())

The multiselect doesn’t behave as expected

  1. The multiselect has an erratic behavior - it sometimes allows me to select multiple cities sometimes, it just closes the dropdown
  2. The list of available cities isn’t updated - say i add a city in exclude option it shows the option in the include as well but when i click on it. the dropdown just closes and next time i open the options are corrected and doesn’t show the state already chosen
  • Help me with the fix
2

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