Create a select list input control
Create a select list that can be used to choose a single or multiple items from a list of values.
selectInput( inputId, label, choices, selected = NULL, multiple = FALSE, selectize = TRUE, width = NULL, size = NULL ) selectizeInput(inputId, ..., options = NULL, width = NULL)
inputId |
The |
label |
Display label for the control, or |
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, vectors, or factors. In
this case, the outermost names will be used as the group labels (leveraging
the |
selected |
The initially selected value (or multiple values if |
multiple |
Is selection of multiple items allowed? |
selectize |
Whether to use selectize.js or not. |
width |
The width of the input, e.g. |
size |
Number of items to show in the selection box; a larger number
will result in a taller box. Not compatible with |
... |
Arguments passed to |
options |
A list of options. See the documentation of selectize.js
for possible options (character option values inside |
By default, selectInput() and selectizeInput() use the JavaScript library
selectize.js (https://github.com/selectize/selectize.js) instead of
the basic select input element. To use the standard HTML select input
element, use selectInput() with selectize=FALSE.
In selectize mode, if the first element in choices has a value of "", its
name will be treated as a placeholder prompt. For example:
selectInput("letter", "Letter", c("Choose one" = "", LETTERS))
Performance note: selectInput() and selectizeInput() can slow down
significantly when thousands of choices are used; with legacy browsers like
Internet Explorer, the user interface may hang for many seconds. For large
numbers of choices, Shiny offers a "server-side selectize" option that
massively improves performance and efficiency; see
this selectize article
on the Shiny Dev Center for details.
A select list control that can be added to a UI definition.
A vector of character strings, usually of length
1, with the value of the selected items. When multiple=TRUE and
nothing is selected, this value will be NULL.
The selectize input created from 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
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).
Other input elements:
actionButton(),
checkboxGroupInput(),
checkboxInput(),
dateInput(),
dateRangeInput(),
fileInput(),
numericInput(),
passwordInput(),
radioButtons(),
sliderInput(),
submitButton(),
textAreaInput(),
textInput(),
varSelectInput()
## 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)
})
}
)
}Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.