"Select-All" Button for Multiselect

🎈 Using Streamlit
4

Hi,

I came up with the following solution that improves on method 3 as it does not lose all selected options when removing single ones after clicking “Select all”. It uses the st.session_state and a callback for the “Select all” button and looks a bit hacky :slight_smile: :

import streamlit as st

st.header("Option 4")

all_options = ["A", "B", "C"]

selected_options_4 = st.multiselect(
    "Select one or more options:", all_options, key="selected_options_4"
)

def _select_all():
    st.session_state.selected_options_4 = all_options
st.button("Select all", on_click=_select_all)

selected_options_4