radioButtons

radioButtons(inputId, label, choices, selected = NULL, inline = FALSE,
  width = NULL)

Arguments

inputId	The input slot that will be used to access the value.
label	Display label for the control, or NULL for no label.
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)
width	The width of the input, e.g. '400px', or '100%'; see validateCssUnit.

Value

A set of radio buttons that can be added to a UI definition.

Description

Create a set of radio buttons used to select an item from a list.

Details

If you need to represent a "None selected" state, it's possible to default the radio buttons to have no options selected by using selected = character(0). However, this is not recommended, as it gives the user no way to return to that state once they've made a selection. Instead, consider having the first of your choices be c("None selected" = "").

Examples

## Only run examples in interactive R sessions
if (interactive()) {

ui <- fluidPage(
  radioButtons("dist", "Distribution type:",
               c("Normal" = "norm",
                 "Uniform" = "unif",
                 "Log-normal" = "lnorm",
                 "Exponential" = "exp")),
  plotOutput("distPlot")
)

server <- function(input, output) {
  output$distPlot <- renderPlot({
    dist <- switch(input$dist,
                   norm = rnorm,
                   unif = runif,
                   lnorm = rlnorm,
                   exp = rexp,
                   rnorm)

    hist(dist(500))
  })
}

shinyApp(ui, server)
}

See also

updateRadioButtons

Other input elements: actionButton, checkboxGroupInput, checkboxInput, dateInput, dateRangeInput, fileInput, numericInput, passwordInput, selectInput, sliderInput, submitButton, textAreaInput, textInput