3 6 Checkbox Explained

Key Concepts

• Checkbox Widget: A user interface element that allows users to select or deselect an option.
• Label: A text description that explains the purpose of the checkbox.
• State: The current status of the checkbox, either checked or unchecked.

Explanation

1. Checkbox Widget

The st.checkbox widget in Streamlit is used to create a checkbox that users can toggle on or off. This widget is useful for creating binary choices or allowing users to select multiple options.

2. Label

The label parameter in st.checkbox is a string that describes the purpose of the checkbox. This label is displayed next to the checkbox, helping users understand what the checkbox represents.

3. State

The state of the checkbox is either checked (True) or unchecked (False). This state can be used to trigger different actions or display different content based on the user's selection.

Examples

Example 1: Basic Checkbox

import streamlit as st

agree = st.checkbox("Do you agree to the terms?")
if agree:
    st.write("You agreed to the terms.")
else:
    st.write("You did not agree to the terms.")
    

Example 2: Multiple Checkboxes

import streamlit as st

options = ["Option 1", "Option 2", "Option 3"]
selected_options = []

for option in options:
    if st.checkbox(option):
        selected_options.append(option)

st.write("You selected:", selected_options)
    

Analogies

Think of a checkbox as a digital version of a physical checkbox on a paper form. The label is like the question or statement next to the checkbox, and the state is like whether the checkbox is marked or not. For example, a checkbox labeled "I agree to the terms and conditions" would be checked if the user agrees and unchecked if they do not.

Conclusion

Understanding and using st.checkbox effectively can greatly enhance the interactivity of your Streamlit app. By providing clear labels and using the checkbox state to trigger actions, you can create dynamic and user-friendly applications.