shiny/man/selectInput.Rd

% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/input-select.R
\name{selectInput}
\alias{selectInput}
\alias{selectizeInput}
\title{Create a select list input control}
\usage{
selectInput(inputId, label, choices, selected = NULL, multiple = FALSE,
  selectize = TRUE, width = NULL, size = NULL)

selectizeInput(inputId, ..., options = NULL, width = NULL)
}
\arguments{
\item{inputId}{The \code{input} slot that will be used to access the value.}

\item{label}{Display label for the control, or \code{NULL} for no label.}

\item{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.
It's also possible to group related inputs by providing a named list whose
elements are (either named or unnamed) lists or vectors. In this case, the
outermost names will be used as the group labels (leveraging the
\code{<optgroup>} HTML tag) for the elements in the respective sublist. See
the example section for a small demo of this feature.}

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

\item{multiple}{Is selection of multiple items allowed?}

\item{selectize}{Whether to use \pkg{selectize.js} or not.}

\item{width}{The width of the input, e.g. \code{'400px'}, or \code{'100\%'};
see \code{\link{validateCssUnit}}.}

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

\item{...}{Arguments passed to \code{selectInput()}.}

\item{options}{A list of options. See the documentation of \pkg{selectize.js}
for possible options (character option values inside \code{\link[base]{I}()} will
be treated as literal JavaScript code; see \code{\link{renderDataTable}()}
for details).}
}
\value{
A select list control that can be added to a UI definition.
}
\description{
Create a select list that can be used to choose a single or multiple items
from a list of values.
}
\details{
By default, \code{selectInput()} and \code{selectizeInput()} use the
JavaScript library \pkg{selectize.js}
(\url{https://github.com/selectize/selectize.js}) instead of the basic
select input element. To use the standard HTML select input element, use
\code{selectInput()} with \code{selectize=FALSE}.

In selectize mode, if the first element in \code{choices} has a value of
\code{""}, its name will be treated as a placeholder prompt. For example:
\code{selectInput("letter", "Letter", c("Choose one" = "", LETTERS))}
}
\note{
The selectize input created from \code{selectizeInput()} 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
\pkg{selectize.js}. However, the selectize input created from
\code{selectInput(..., selectize = TRUE)} will ignore the empty string
value when it is a single choice input and the empty string is not in the
\code{choices} argument. This is to keep compatibility with
\code{selectInput(..., selectize = FALSE)}.
}
\examples{
## Only run examples in interactive R sessions
if (interactive()) {

# basic example
shinyApp(
  ui = fluidPage(
    selectInput("variable", "Variable:",
                c("Cylinders" = "cyl",
                  "Transmission" = "am",
                  "Gears" = "gear")),
    tableOutput("data")
  ),
  server = function(input, output) {
    output$data <- renderTable({
      mtcars[, c("mpg", input$variable), drop = FALSE]
    }, rownames = TRUE)
  }
)

# demoing group support in the `choices` arg
shinyApp(
  ui = fluidPage(
    selectInput("state", "Choose a state:",
      list(`East Coast` = list("NY", "NJ", "CT"),
           `West Coast` = list("WA", "OR", "CA"),
           `Midwest` = list("MN", "WI", "IA"))
    ),
    textOutput("result")
  ),
  server = function(input, output) {
    output$result <- renderText({
      paste("You chose", input$state)
    })
  }
)
}
}
\seealso{
\code{\link{updateSelectInput}} \code{\link{varSelectInput}}

Other input elements: \code{\link{actionButton}},
  \code{\link{checkboxGroupInput}},
  \code{\link{checkboxInput}}, \code{\link{dateInput}},
  \code{\link{dateRangeInput}}, \code{\link{fileInput}},
  \code{\link{numericInput}}, \code{\link{passwordInput}},
  \code{\link{radioButtons}}, \code{\link{sliderInput}},
  \code{\link{submitButton}}, \code{\link{textAreaInput}},
  \code{\link{textInput}}, \code{\link{varSelectInput}}
}
\concept{input elements}