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


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)


Change the value of a radio input on the client


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.


## Not run: ------------------------------------ # 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) # ) # }) # }) ## ---------------------------------------------

See also