Shiny by RStudio

Change the value of a select input on the client

updateSelectInput(session, inputId, label = NULL, choices = NULL,
  selected = NULL)

updateSelectizeInput(session, inputId, label = NULL, choices = NULL,
  selected = NULL, options = list(), server = FALSE)

Arguments

session The session object passed to function given to shinyServer.
inputId The id of the input object.
label The label to set for the input object.
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. This can also be a named list whose elements are (either named or unnamed) lists or vectors. If this is the case, the outermost names will be used as the "optgroup" label for the elements in the respective sublist. This allows you to group and label similar choices. See the example section for a small demo of this feature.
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.
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).
server whether to store choices on the server side, and load the select options dynamically on searching, instead of writing all choices into the page at once (i.e., only use the client-side version of selectize.js)

Description

Change the value of a select input on the client

Details

The input updater functions send a message to the client, telling it to change the settings of an input object. The messages are collected and sent after all the observers (including outputs) have finished running.

The syntax of these functions is similar to the functions that created the inputs in the first place. For example, numericInput() and updateNumericInput() take a similar set of arguments.

Any arguments with NULL values will be ignored; they will not result in any changes to the input object on the client.

For radioButtons(), checkboxGroupInput() and selectInput(), the set of choices can be cleared by using choices=character(0). Similarly, for these inputs, the selected item can be cleared by using selected=character(0).

Examples

## Only run examples in interactive R sessions if (interactive()) { ui <- fluidPage( p("The checkbox group controls the select input"), checkboxGroupInput("inCheckboxGroup", "Input checkbox", c("Item A", "Item B", "Item C")), selectInput("inSelect", "Select input", c("Item A", "Item B", "Item C")) ) server <- function(input, output, session) { observe({ x <- input$inCheckboxGroup # Can use character(0) to remove all choices if (is.null(x)) x <- character(0) # Can also set the label and select items updateSelectInput(session, "inSelect", label = paste("Select input label", length(x)), choices = x, selected = tail(x, 1) ) }) } shinyApp(ui, server) }

See also

selectInput