Add song id in url param

[slevin48]

Set app status with query params (st.experimental_get_query_params)

• https://docs.streamlit.io/library/api-reference/utilities/st.experimental_get_query_params
• https://discuss.streamlit.io/t/how-to-use-dropdown-with-url-query-parameter/13337/2
• Add st.experimental_(get|set)_query_params capability streamlit/streamlit#1169

[slevin48]

Solved here:
https://discuss.streamlit.io/t/how-to-use-dropdown-with-url-query-parameter/13337

import streamlit as st

# callback to update query param on selectbox change
def update_params():
    st.experimental_set_query_params(option=st.session_state.qp)

options = ["cat", "dog", "mouse", "bat", "duck"]

query_params = st.experimental_get_query_params()

# set selectbox value based on query param, or provide a default
ix = 0
if query_params:
    try:
        ix = options.index(query_params['option'][0])
    except ValueError:
        pass

selected_option = st.radio(
    "Param", options, index=ix, key="qp", on_change=update_params
)

# set query param based on selection
st.experimental_set_query_params(option=selected_option)

# display for debugging purposes
st.write('---', st.experimental_get_query_params())

[slevin48]

[slevin48]

Solved with session state and callback function
https://blog.streamlit.io/session-state-for-streamlit/

[slevin48]

prototyped in param_app.py