How to update some of the page

[jay]

You need to introduce state for that, either have a look here for an example (if you search state streamlit there are various non official implementations around):

Multi-page app with session state

Edit: Streamlit 0.84.0 has officially introduced session state. Go check it out: Session State for Streamlit Hello there For a project I needed to build multi-page app with a settings page. As I’ve seen this topic requesting the feature, I decided to share the solution I came up with. It features a custom version of @thiago’s SessionState. It still relies on hacks, but it should work in most cases. It was tested with Streamlit version 0.61.0 (and now 0.65). Things you must…

Or use the new feature of 0.65 for query_params
https://github.com/streamlit/release-demos/blob/release-0-65-0/demos/query_params.py

Version 0.65.0

Version 0.65.0 Highlights: Ability to set page title, favicon, sidebar state, and wide mode via st.beta_set_page_config(). See our documentation for details. Add stateful behaviors through the use of query parameters with st.experimental_set_query_params and st.experimental_get_query_params. Thanks @zhaoooyue! Improved pandas dataframe support for st.radio, st.selectbox, and st.multiselect. Break out of your Streamlit app with st.stop. …