Select variables from a data frame — varSelectInput

varSelectInput(inputId, label, data, selected = NULL, multiple = FALSE,
  selectize = TRUE, width = NULL, size = NULL)

varSelectizeInput(inputId, ..., options = NULL, width = NULL)



The input slot that will be used to access the value.


Display label for the control, or NULL for no label.


A data frame. Used to retrieve the column names as choices for a selectInput()


The initially selected value (or multiple values if multiple = TRUE). If not specified then defaults to the first value for single-select lists and no values for multiple select lists.


Is selection of multiple items allowed?


Whether to use selectize.js or not.


The width of the input, e.g. '400px', or '100%'; see validateCssUnit().


Number of items to show in the selection box; a larger number will result in a taller box. Not compatible with selectize=TRUE. Normally, when multiple=FALSE, a select input will be a drop-down list, but when size is set, it will be a box instead.


Arguments passed to varSelectInput().


A list of options. See the documentation of selectize.js for possible options (character option values inside base::I() will be treated as literal JavaScript code; see renderDataTable() for details).


Create a select list that can be used to choose a single or multiple items from the column names of a data frame.


A variable select list control that can be added to a UI definition.


By default, varSelectInput() and selectizeInput() use the JavaScript library selectize.js ( to instead of the basic select input element. To use the standard HTML select input element, use selectInput() with selectize=FALSE.


The variable selectize input created from varSelectizeInput() allows deletion of the selected option even in a single select input, which will return an empty string as its value. This is the default behavior of selectize.js. However, the selectize input created from selectInput(..., selectize = TRUE) will ignore the empty string value when it is a single choice input and the empty string is not in the choices argument. This is to keep compatibility with selectInput(..., selectize = FALSE).

Server value

The resulting server input value will be returned as:

See also


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


# single selection
  ui = fluidPage(
    varSelectInput("variable", "Variable:", mtcars),
  server = function(input, output) {
    output$data <- renderPlot({
      ggplot(mtcars, aes(!!input$variable)) + geom_histogram()

# multiple selections
if (FALSE) {
 ui = fluidPage(
   varSelectInput("variables", "Variable:", mtcars, multiple = TRUE),
 server = function(input, output) {
   output$data <- renderTable({
      if (length(input$variables) == 0) return(mtcars)
      mtcars %>% dplyr::select(!!!input$variables)
   }, rownames = TRUE)