shiny (version 0.12.2)

updateRadioButtons: Change the value of a radio input on the client

Description

Change the value of a radio input on the client

Usage

updateRadioButtons(session, inputId, label = NULL, choices = NULL,
  selected = NULL, inline = FALSE)

Arguments

session

The session object passed to function given to shinyServer.

inputId

The id of the input object.

label

The label to set for the input object.

choices

List of values to select from (if elements of the list are named then that name rather than the value is displayed to the user)

selected

The initially selected value (if not specified then defaults to the first value)

inline

If TRUE, render the choices inline (i.e. horizontally)

Details

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, numericInput() and updateNumericInput() take a similar set of arguments.

Any arguments with NULL values will be ignored; they will not result in any changes to the input object on the client.

See Also

radioButtons

Examples

shinyServer(function(input, output, session) {

  observe({
    # We'll use the input$controller variable multiple times, so save it as x
    # for convenience.
    x <- input$controller

    r_options <- list()
    r_options[[sprintf("option label %d 1", x)]] <- sprintf("option-%d-1", x)
    r_options[[sprintf("option label %d 2", x)]] <- sprintf("option-%d-2", x)

    # Change values for input$inRadio
    updateRadioButtons(session, "inRadio", choices = r_options)

    # Can also set the label and select an item
    updateRadioButtons(session, "inRadio2",
      label = paste("Radio label", x),
      choices = r_options,
      selected = sprintf("option-%d-2", x)
    )
  })
})