ui.input_action_button

ui.input_action_button(id, label, *, icon=None, width=None, disabled=False, **kwargs)

Creates an action button whose value is initially zero, and increments by one each time it is pressed.

Parameters

id: str

An input id.

label: TagChild

An input label.

icon: TagChild = None

An icon to appear inline with the button/link.

width: Optional[str] = None

The CSS width, e.g. ‘400px’, or ‘100%’

disabled: bool = False

If True, the button will not be clickable. Use update_action_button to dynamically enable/disable the button.

**kwargs: TagAttrValue = {}

Attributes to be applied to the button.

Returns

Type	Description
Tag	A UI element

Notes

Server value

An integer representing the number of clicks.

See Also

• update_action_button
• input_action_link
• event

Examples

#| standalone: true
#| components: [editor, viewer]
#| layout: vertical
#| viewerHeight: 400

## file: app.py
import matplotlib.pyplot as plt
import numpy as np

from shiny import App, Inputs, Outputs, Session, reactive, render, ui

app_ui = ui.page_fluid(
    ui.input_slider("n", "Number of observations", min=0, max=1000, value=500),
    ui.input_action_button("go", "Go!", class_="btn-success"),
    ui.output_plot("plot"),
)


def server(input: Inputs, output: Outputs, session: Session):
    @render.plot(alt="A histogram")
    # Use reactive.event() to invalidate the plot only when the button is pressed
    # (not when the slider is changed)
    @reactive.event(input.go, ignore_none=False)
    def plot():
        np.random.seed(19680801)
        x = 100 + 15 * np.random.randn(input.n())
        fig, ax = plt.subplots()
        ax.hist(x, bins=30, density=True)
        return fig


app = App(app_ui, server)

#| standalone: true
#| components: [editor, viewer]
#| layout: vertical
#| viewerHeight: 400

## file: app.py
from shiny import App, Inputs, reactive, render, ui

app_ui = ui.page_fluid(
    ui.input_text("name", "Your Name"),
    ui.input_action_button("greet", "Say Hello", disabled=True),
    ui.output_ui("hello"),
)


def server(input: Inputs):
    @reactive.effect
    @reactive.event(input.name)
    def set_button_state():
        if input.name():
            ui.update_action_button("greet", disabled=False)
        else:
            ui.update_action_button("greet", disabled=True)

    @render.ui
    @reactive.event(input.greet)
    def hello():
        return ui.p(f"Hello, {input.name()}!", class_="fs-1 text-primary mt-3")


app = App(app_ui, server)