selectInput(inputId, label, choices, selected = NULL, multiple = FALSE,
  selectize = TRUE, width = NULL, size = NULL)

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


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 (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.
multiple Is selection of multiple items allowed?
selectize Whether to use selectize.js or not.
width The width of the input, e.g. '400px', or '100%'; see validateCssUnit.
size 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 selectInput().
options A list of options. See the documentation of selectize.js for possible options (character option values inside I() will be treated as literal JavaScript code; see renderDataTable() for details).


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


Create a select list that can be used to choose a single or multiple items from a list of values.


By default, selectInput() 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.

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))


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).


selectInput("variable", "Variable:", c("Cylinders" = "cyl", "Transmission" = "am", "Gears" = "gear"))
<div class="form-group shiny-input-container"> <label class="control-label" for="variable">Variable:</label> <div> <select id="variable"><option value="cyl" selected>Cylinders</option> <option value="am">Transmission</option> <option value="gear">Gears</option></select> <script type="application/json" data-for="variable" data-nonempty="">{}</script> </div> </div>

See also


Other input.elements: actionButton, actionLink; animationOptions, sliderInput; checkboxGroupInput; checkboxInput; dateInput; dateRangeInput; fileInput; numericInput; passwordInput; radioButtons; submitButton; textInput