shiny.ui.update_numeric(id, *, label=None, value=None, min=None, max=None, step=None, session=None)#

Change the value of a number input on the client.

  • id (str) – An input id.

  • label (Optional[str]) – An input label.

  • value (Optional[float]) – A new value.

  • min (Optional[float]) – The minimum allowed value.

  • max (Optional[float]) – The maximum allowed value.

  • step (Optional[float]) – Interval to use when stepping between min and max.

  • session (Optional[Session]) – The Session object passed to the server function of a App().


The input updater functions send a message to the client, telling it to change the settings of an input object. The messages are collected and sent after all the observers (including outputs) have finished running.

The syntax of these functions is similar to the functions that created the inputs in the first place. For example, input_numeric() and update_numeric() take a similar set of arguments.

Any arguments with None values will be ignored; they will not result in any changes to the input object on the client.

For update_radio_buttons(), update_checkbox_group(), and update_select(), the set of choices can be cleared by using choices=[]. Similarly, for these inputs, the selected item can be cleared by using selected=[].

See also



#| standalone: true
#| components: [editor, viewer]
#| layout: vertical
#| viewerHeight: 400
from shiny import *

app_ui = ui.page_fluid(
    ui.input_slider("controller", "Controller", min=0, max=20, value=10),
    ui.input_numeric("inNumber", "Input number", 0),
    ui.input_numeric("inNumber2", "Input number 2", 0),

def server(input: Inputs, output: Outputs, session: Session):
    def _():
        x = input.controller()
        ui.update_numeric("inNumber", value=x)
            label="Number label " + str(x),
            min=x - 10,
            max=x + 10,

app = App(app_ui, server)
Return type