Issue with st.empty()

[Harish_Kodarapu]

Hello all,

I am facing a special issue as shown in the recording. The following is what I require in steps.

1. Select an option from the selectbar
2. Login with the credentials
3. On successful login, the login and password text_inputs should be vanished and file_uploader should arise.
4. After this a text_input for number of layers should be present.

The problem is as follows.
The moment I enter the input and press enter, the text_input vanishes and previously hidden login text_inputs are again shown.

Please let me know if you have any solution for this. Thanks in advance.

file:///C:/Users/CDS/Downloads/streamlit-sample-2020-12-01-21-12-56.webm

[Marisa_Smith]

Hey @Harish_Kodarapu,

We actually cant see your screen recording, as you can’t post screen recordings on the forum. I imagine your having an issue with the statefulness of your app based on your description. Because the text_input fields do not preserve the users selection after multiple clicks/interactions on the page, when you hit enter on the second text_input it resets the app and it runs the script from top to bottom again.

We are currently creating a session state for streamlit to combat this very thing. IN the mean time there are some workarounds:

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…

Programmable State for Streamlit

UPDATE: Streamlit now has official support for Session State! More info here Hey Community , In a lot of ways getting a Streamlit app to store internal state, like information a user entered in a form, is simply too tricky. We’ve created some workarounds for session state, but we want to give you a baked-in, elegant version of programmable state so you can build apps with intricate sequential logic, such as multi-page apps. We’d like to use this topic as a central location for your idea…

Also, checkout our state survey if you want to be involved in the development of session state!

Programmable State Survey!

Hello Streamlit Community! My name is Abhi and I have recently joined Streamlit as a Product Manager. One of my first projects at Streamlit is to start working on Programmable State. Previously, Thiago has also posted about Programmable State here: Programmable State for Streamlit and the community feedback has been super helpful! We have started scoping the work and building prototypes. We are looking to interview users as well as sign up users for a closed beta program for Programmable State…

Happy Streamlit-ing!
Marisa

[oltipreka]

Have you found a solution to this problem?

I am facing something similar.

[Marisa_Smith]

Hi @oltipreka,

With the release of session state this should no longer be an issue for you!

You can store the values of all of your widgets in the state object and then use them on reruns of your app to dynamically change the output!

Check out the blog post here: Store Information Across App Interactions | Session State

State API here: Session State API — Streamlit 0.86.0 documentation

Upgrade Streamlit to 0.84 or above to be able to use this new feature!

Happy Streamlit-ing!
Marisa