updateCheckboxGroupInput: Change the value of a checkbox group input on the client
In ymd526442121/Rproject_shiny: Web Application Framework for R

Description Usage Arguments Details See Also Examples

Change the value of a checkbox group input on the client

1 2	updateCheckboxGroupInput(session, inputId, label = NULL, choices = NULL, selected = NULL, inline = FALSE)

`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 show checkboxes for. If elements of the list are named then that name rather than the value is displayed to the user.
`selected`	The values that should be initially selected, if any.
`inline`	If `TRUE`, render the choices inline (i.e. horizontally)

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).

checkboxGroupInput

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

ui <- fluidPage(
  p("The first checkbox group controls the second"),
  checkboxGroupInput("inCheckboxGroup", "Input checkbox",
    c("Item A", "Item B", "Item C")),
  checkboxGroupInput("inCheckboxGroup2", "Input checkbox 2",
    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
    updateCheckboxGroupInput(session, "inCheckboxGroup2",
      label = paste("Checkboxgroup label", length(x)),
      choices = x,
      selected = x
    )
  })
}

shinyApp(ui, server)
}