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Contents
Change execution
Group multiple widgets

Execution flow

Change execution

By default, Streamlit apps execute the script entirely, but we allow some functionality to handle control flow in your applications.

Modal dialog

Insert a modal dialog that can rerun independently from the rest of the script.

@st.dialog("Sign up")
def email_form():
    name = st.text_input("Name")
    email = st.text_input("Email")

Fragments

Define a fragment to rerun independently from the rest of the script.

@st.fragment(run_every="10s")
def fragment():
    df = get_data()
    st.line_chart(df)

Rerun script

Rerun the script immediately.

st.rerun()

Stop execution

Stops execution immediately.

st.stop()

Group multiple widgets

By default, Streamlit reruns your script everytime a user interacts with your app. However, sometimes it's a better user experience to wait until a group of related widgets is filled before actually rerunning the script. That's what st.form is for!

Forms

Create a form that batches elements together with a “Submit" button.

with st.form(key='my_form'):
    name = st.text_input("Name")
    email = st.text_input("Email")
    st.form_submit_button("Sign up")

Form submit button

Display a form submit button.

with st.form(key='my_form'):
    name = st.text_input("Name")
    email = st.text_input("Email")
    st.form_submit_button("Sign up")

Third-party components

Pydantic

Auto-generate Streamlit UI from Pydantic Models and Dataclasses. Created by @lukasmasuch.

import streamlit_pydantic as sp

sp.pydantic_form(key="my_form",
  model=ExampleModel)

Streamlit Pages

An experimental version of Streamlit Multi-Page Apps. Created by @blackary.

from st_pages import Page, show_pages, add_page_title

show_pages([ Page("streamlit_app.py", "Home", "🏠"),
  Page("other_pages/page2.py", "Page 2", ":books:"), ])

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