selectInput: Create a select list input control
In ymd526442121/Rproject_shiny: Web Application Framework for R

Description Usage Arguments Details Value Note See Also Examples

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 `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).

By default, selectInput() and selectizeInput() use the JavaScript library selectize.js (https://github.com/brianreavis/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))

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

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).

updateSelectInput

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

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

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)
}

shinyApp(ui, server)
}