I am trying to code (newbie) a page in streamlit that has a number of buttons that display stock tickers. When the user clicks each button I would like to store the ticker string to a list. I dont know what I am doing wrong… please see my code below. I also dont understand the use of key in st.button
On top of the session management, the on_click parameter that you need to pass to the button is the function per se (i.e., add_symbols), not to call the function (i.e., add_symbols(xxx)). In this case, you are executing the function which at the end returns None, and that None is then passed to the on_click of the button. Also, the args must be contained within a list, even if it’s only one.
import streamlit as st
col1, col2 = st.columns(2)
# Keep the list in the session state
if 'myList' not in st.session_state:
st.session_state['myList'] = []
symbols_list = st.session_state['myList']
def add_symbols(tckr):
symbols_list.append(tckr)
col2.write(symbols_list)
# Reset the session state
def empty_list(): del st.session_state['myList']
with col1:
st.button(label="MYTIL", on_click=add_symbols, args=["MYTIL.AT"])
st.button(label="OPAP", on_click=add_symbols, args=["OPAP.AT"])
st.button(label="ADMIE", on_click=add_symbols, args=["ADMIE.AT"])
st.button(label="EYDAP", on_click=add_symbols, args=["EYDAP.AT"])
st.button(label="ELPE", on_click=add_symbols, args=["ELPE.AT"])
st.button(label="HTO", on_click=add_symbols, args=["HTO.AT"])
st.button(label="❌", on_click=empty_list)
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