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以下のシャイニーアプリがあるとしましょう-

library(shinyWidgets); library("shiny")
ui <- fluidPage(
  multiInput(
    inputId = "id", label = "Fruits :",
     choices = c("Banana", "Blueberry", "Cherry",
                "Coconut", "Grapefruit", "Kiwi",
                "Lemon", "Lime", "Mango", "Orange",
                "Papaya"),
    selected = "Banana", width = "400px",
     options = list(
       enable_search = FALSE,
       non_selected_header = "Choose between:",
      selected_header = "You have selected:"
    )
   ),
   verbatimTextOutput(outputId = "res")
 )

 server <- function(input, output, session) {
   output$res <- renderPrint({
     input$id
  })
 }

shinyApp(ui = ui, server = server)

ここで、ユーザーが選択できるアイテムの数に上限を3 つ設定したいと思います。これを達成する方法はありますmultiInput()か?

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