Read data from one input and use it in another input, within the same form, without submitting the form

[edsaac]

Perhaps related:

Updating radio inside a form

Widgets can change if they are defined outside the form but are positioned inside the form using a placeholder like st.empty. Not sure if that is expected behavior or not, but looks like a feature to me [dynamicForm] Code: import streamlit as st with st.form("myform"): "### A form" # These exist within the form but won't wait for the submit button placeholder_for_radio = st.empty() placeholder_for_selectbox = st.empty() # Other components actually wait fo…