shiny.ui.update_radio_buttons(id, *, label=None, choices=None, selected=None, inline=False, session=None)#

Change the value of a radio input on the client.

  • id (str) – An input id.

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

  • choices (Union[List[str], Mapping[str, Union[Tagifiable, Tag, MetadataNode, str, TagList, float, None, Dict[str, Union[str, float, bool, None]], Sequence[Union[Tagifiable, Tag, MetadataNode, str, TagList, float, None, Dict[str, Union[str, float, bool, None]], Sequence[ForwardRef]]]]], None]) – Either a list of choices or a dictionary mapping choice values to labels. Note that if a dictionary is provided, the keys are used as the (input) values so that the dictionary values can hold HTML labels.

  • selected (Optional[str]) – The values that should be initially selected, if any.

  • inline (bool) – If True`, the result is displayed inline

  • session (Optional[Session]) – A Session instance. If not provided, it is inferred via get_current_session().


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=[].


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

app_ui = ui.page_fluid(
    ui.tags.p("The first radio button group controls the second"),
        "inRadioButtons", "Input radio buttons", ["Item A", "Item B", "Item C"]
        "inRadioButtons2", "Input radio buttons 2", ["Item A", "Item B", "Item C"]

def server(input: Inputs, output: Outputs, session: Session):
    def _():
        x = input.inRadioButtons()

        # Can also set the label and select items
            label="Radio buttons label " + x,

app = App(app_ui, server)
Return type