Changing variable with slider reloads page and resets all variables

Summary

When clicking on a slider to change its value, the app gets reloaded and all variables are changed to their default values.

Steps to reproduce

I have an app with several parameters, set using a variety of Streamlit widgets. I try to change the value of one of the variables (a slider) by clicking on a point along the slider. Here is the slider code:

temp = st.slider("Temperature (F)", 
            min_value=30, 
            max_value=100,
            value=70,
            step=1)

Expected behavior:

I expect the variable to change and the app to run with the value that is selected.

Actual behavior:

The app reloads in the browser and all variables (including the slider on which I selected the value) are reverted to their default values.

Debug info

• Streamlit version: 0.66.0
• Python version: 3. I 8.5
• Using Conda: yes
• OS version: macOS Catalina
• Browser version: Chrome 85

Additional information

If needed, add any other context about the problem here. For example, did this bug come from https://discuss.streamlit.io or another site? Link the original source here!

[randyzwitch]

Hi @fonnesbeck -

Can you provide more of a code example for us to evaluate? Something that demonstrates the behavior you think is incorrect.

Best, Randy

[ValerioFerreira]

I appreciate the feedback! I’ll be reading it right now!

Enviado do Emailhttps://go.microsoft.com/fwlink/?LinkId=550986 para Windows

De: Randy @.> Enviado:segunda-feira, 6 de junho de 2022 17:57 Para: @.> Cc:Valério @.>; @.> Assunto: Re: [streamlit/streamlit] Changing variable with slider reloads page and resets all variables (#1996)

The Streamlit execution model is that the code always runs top-to-bottom. It does not differentiate that the slider is downstream of the other code in a DAG-like manner.

If you want to avoid having expensive processes run each time, please see the documentation which refers to caching within Streamlithttps://docs.streamlit.io/library/advanced-features/experimental-cache-primitives.

Best, Randy

— Reply to this email directly, view it on GitHubhttps://github.com/streamlit/streamlit/issues/1996#issuecomment-1147920322, or unsubscribehttps://github.com/notifications/unsubscribe-auth/AWFIL565AGPVEO22BX2EITLVNZQ2HANCNFSM4RL763FQ. You are receiving this because you commented.Message ID: @.***>