Input Widgets in Streamlit

Widgets are fundamental components in user interfaces, and in Streamlit, they allow you to create interactivity directly in your applications. With just a few lines of code, you can add buttons, checkboxes, selectors, and much more.

Main Input Widgets

st.checkbox()

Displays a checkbox that returns a Boolean value (True if checked, False otherwise).

Example:

import streamlit as st

agree = st.checkbox('I agree to the terms')
if agree:
    st.write('Thank you for agreeing!')

st.button()

Displays a button that can be used to trigger actions.

Example:

if st.button('Click here!'):
    st.write('Button pressed!')

st.radio()

Displays a set of radio buttons for single selection.

Example:

choice = st.radio('Choose a course:', ['Python', 'Data Science', 'Web Development'])
st.write(f'You chose: {choice}')

st.selectbox()

Allows selecting an item from a dropdown list.

Example:

city = st.selectbox('Choose a city:', ['Luanda', 'Maputo', 'Lisbon'])
st.write(f'Selected city: {city}')

st.multiselect()

Allows selecting multiple items from a list.

Example:

fruits = st.multiselect('Choose your favorite fruits:', ['Apple', 'Banana', 'Grapes', 'Mango'])
st.write(f'You chose: {", ".join(fruits)}')

st.slider()

Allows selecting a value from a range.

Example:

age = st.slider('What is your age?', 0, 100, 25)
st.write(f'Age: {age} years')

st.select_slider()

Similar to the slider but allows defining custom values.

Example:

mood = st.select_slider('How are you feeling today?', options=['Sad', 'Neutral', 'Happy'], value='Neutral')
st.write(f'Current mood: {mood}')

Additional Widgets

st.number_input()

For number input with control over minimum and maximum values.

Example:

number = st.number_input('Choose a number:', min_value=1, max_value=100, value=10)
st.write(f'Chosen number: {number}')

st.text_input()

For text input.

Example:

email = st.text_input('Enter your email:')
st.write(f'Email: {email}')

st.date_input()

For selecting a date.

Example:

date = st.date_input('Select a date:')
st.write(f'Selected date: {date}')

st.time_input()

For selecting a time.

Example:

time = st.time_input('Choose a time:')
st.write(f'Selected time: {time}')

st.text_area()

For multi-line text input.

Example:

description = st.text_area('Description:')
st.write(f'Provided description: {description}')

st.file_uploader()

For file uploads.

Example:

file = st.file_uploader('Upload a file:', type=['png', 'jpg', 'pdf'])
if file:
    st.write(f'Uploaded file: {file.name}')

st.color_picker()

For selecting a color.

Example:

color = st.color_picker('Choose a color:')
st.write(f'Selected color: {color}')

With these widgets, you can create highly interactive applications and provide a seamless user experience.

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