updateRadioButtons {shiny} | R Documentation

## 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.

For `radioButtons()`, `checkboxGroupInput()` and `selectInput()`, the set of choices can be cleared by using `choices=character(0)`

### See Also

`radioButtons`

### Examples

    ## 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)
        )
      })
    })

    ## End(Not run)

[Package shiny version 0.13.2 Index]