streamlit / streamlit

Streamlit — A faster way to build and share data apps.

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st.expander expanded/collapsed state #2399

Open LeoTafti opened 3 years ago

LeoTafti commented 3 years ago

Problem

I'd like to be able to know whether a st.expander is expanded or collapsed (e.g. to show something on the main layout only when an expander in the sidebar is in expanded state).

Solution

MVP: Something like st.expander().expanded as a bool would be nice.

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AngelCarballoCremades commented 3 years ago

Hi!

I'm interested in this issue, any updates so far?

As well as knowing the expanded state, it would be usefull to alter the expanded state too (I want to colapse an expander when something happens).

beep-92 commented 3 years ago

usbader commented 2 years ago

Me too.

jmbf2011 commented 2 years ago

I'm quite interested also in this issue. I would like to avoid API requests which are sent under unexpanded st.expander.

YoungXu06 commented 2 years ago

Getting expander state is a must especially when I need to monitor if users visit the content inside, looking forward to seeing an update!

enzedonline commented 2 years ago

Would like to see this. I want to hide charts etc not in use which are quite processor intensive and only run the code when the expander is expanded. Something like:

exp = st.expander("Something Heavy")
with exp:
    if exp.expanded:
        st.write(heavy_function())

At the moment, everything is run, even in the hidden content.

Could also be included as an attribute for the expander:

with st.expander("Something Heavy", run_when_hidden=False):
    st.write(heavy_function())

(Psuedo-code, but you get the idea 😉)

RobertoFN commented 2 years ago

quannabe commented 2 years ago

This would be an excellent addition! I load multiple expanders that contain some "heavy" code. The initial UI delay when loading is somewhat annoying but using @st.cache helps.

alebarquin commented 1 year ago

Had anyone try this method:

if 'is_expanded' not in st.session_state:
    st.session_state['is_expanded'] = True
container = st.expander("XXX", expanded=st.session_state['is_expanded'])
with container:
    [DO STUFF]
    st.session_state['is_expanded'] = False

I thought it would be a good idea, but working to me though.

ghost commented 1 year ago

Had anyone try this method:

if 'is_expanded' not in st.session_state:
    st.session_state['is_expanded'] = True
container = st.expander("XXX", expanded=st.session_state['is_expanded'])
with container:
    [DO STUFF]
    st.session_state['is_expanded'] = False

I thought it would be a good idea, but working to me though.

Working only after manual rerun.

kaankork commented 1 year ago

This would be a useful functionality. In my use-case, I have two expanders and each has a radio list in it. I want to be able to say - if one expander is expanded (expander_state = True) then radio_selection would use the selection in this expander.