# Change the value of a radio input on the client

### Description

Change the value of a radio input on the client

### Usage

 1 2 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.

For radioButtons(), checkboxGroupInput() and selectInput(), the set of choices can be cleared by using choices=character(0). Similarly, for these inputs, the selected item can be cleared by using selected=character(0).

radioButtons
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 ## Only run examples in interactive R sessions if (interactive()) { ui <- fluidPage( p("The first radio button group controls the second"), radioButtons("inRadioButtons", "Input radio buttons", c("Item A", "Item B", "Item C")), radioButtons("inRadioButtons2", "Input radio buttons 2", c("Item A", "Item B", "Item C")) ) server <- function(input, output, session) { observe({ x <- input\$inRadioButtons # Can also set the label and select items updateRadioButtons(session, "inRadioButtons2", label = paste("radioButtons label", x), choices = x, selected = x ) }) } shinyApp(ui, server) }