Actions are a way to send clickable buttons to the user interface. Each action is attached to a Message and can be used to trigger a python function when the user clicks on it.

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Create an action

Actions are sent to the UI through messages: 
import chainlit as cl

@cl.on_chat_start
async def start():
    # Sending an action button within a chatbot message
    actions = [
        cl.Action(
            name="action_button",
            icon="mouse-pointer-click",
            payload={"value": "example_value"},
            label="Click me!"
        )
    ]

    await cl.Message(content="Interact with this action button:", actions=actions).send()

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Define a Python Callback

To handle the user’s click on the action button, you need to define a callback function with the @cl.action_callback decorator: 
@cl.action_callback("action_button")
async def on_action(action: cl.Action):
    print(action.payload)

Action API

Learn how more about Actions.