Shiny by RStudio

Create radio buttons

radioButtons(inputId, label, choices = NULL, selected = NULL,
  inline = FALSE, width = NULL, choiceNames = NULL, choiceValues = 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). If this argument is provided, then choiceNames and choiceValues must not be provided, and vice-versa.
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.
choiceNames, choiceValues List of names and values, respectively, that are displayed to the user in the app and correspond to the each choice (for this reason, choiceNames and choiceValues must have the same length). If either of these arguments is provided, then the other must be provided and choices must not be provided. The advantage of using both of these over a named list for choices is that choiceNames allows any type of UI object to be passed through (tag objects, icons, HTML code, ...), instead of just simple text. See Examples.

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) ui <- fluidPage( radioButtons("rb", "Choose one:", choiceNames = list( icon("calendar"), HTML("<p style='color:red;'>Red Text</p>"), "Normal text" ), choiceValues = list( "icon", "html", "text" )), textOutput("txt") ) server <- function(input, output) { output$txt <- renderText({ paste("You chose", input$rb) }) } shinyApp(ui, server) }

See also

updateRadioButtons

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