Widget failing to delete

mathcatsand · December 2, 2022, 6:52am

And I just found the thread I mentioned with the bug requiring you to resave all the keys:

github.com/streamlit/streamlit

widget state not synced between multiple pages

opened 06:00PM - 18 Jul 22 UTC

closed 12:12AM - 22 Aug 23 UTC

MartinNowak

type:bug status:confirmed priority:P2 feature:multipage-apps

### Summary I noticed that the widget state for inputs with same keys is not …synced when switching pages. This comes a bit surprising with the [documented](https://docs.streamlit.io/library/get-started/multipage-apps#notes) and observed shared session state. ### Steps to reproduce [![Open in Streamlit Cloud](https://static.streamlit.io/badges/streamlit_badge_black_white.svg)](https://issues.streamlitapp.com/?issue=gh-4989) Code snippet: - index.py ```py import streamlit as st st.write(st.session_state) ``` - pages/a.py ```py import streamlit as st st.write('st.session_state', st.session_state) st.text_input('inp', key='shared_input') ``` - pages/b.py ```py import streamlit as st st.write('st.session_state', st.session_state) st.text_input('inp', key='shared_input') ``` (Please provide a code snippet! This will help expedite us finding and solving the problem.) If applicable, please provide the steps we should take to reproduce the bug: 1. Run `streamlit run index.py` 2. Click on Page A 3. Enter text into input 4. Click on Page B 5. See preserved session state, but empty input widget **Expected behavior:** Widgets with same user keys should be synced when switching pages. **Actual behavior:** Widget state goes out-of-sync with session state. ### Is this a regression? That is, did this use to work the way you expected in the past? no ### Debug info - Streamlit version: 1.11.0 - Python version: 3.10.0 - Using Conda? PipEnv? PyEnv? Pex? Nope - OS version: Fedora 36 - Browser version: Brave/Chrome ### Additional information Current **workaround** is to explicitly copy over the previous' page widget state into the session state to populate widgets using the same keys. ```py st.session_state.update(st.session_state) ``` To not force widgets to invalid selections, our actually used workaround only does so on page navigation. ```py if ctx := get_script_run_ctx(): new_page = ctx.page_script_hash else: logger.warning('Missing streamlit context') new_page = 'unknown' old_page = st.session_state.get('_page_script_hash') if new_page != old_page: # https://github.com/streamlit/streamlit/issues/4989 st.session_state.update(st.session_state) st.session_state['_page_script_hash'] = new_page ``` Also see: - [Session State and Widget State association](https://docs.streamlit.io/library/advanced-features/session-state#session-state-and-widget-state-association) - [An option to keep component values in the session state · Issue #4458 · streamlit/streamlit](https://github.com/streamlit/streamlit/issues/4458) - [Preserve widget state when a widget disappears from the page (demoed via Multipage Apps) · Issue #5813](https://github.com/streamlit/streamlit/issues/5813).

Seems like it should be relevant to your case if you are using widgets with the same key across multiple pages.

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