r - 闪亮仪表板下拉菜单中的反应对象

Question

是否可以基于反应对象呈现仪表板标题下拉菜单或通知项？我的尝试没有奏效。

library(shiny)
library(shinydashboard)
ui <- dashboardPage(
  dashboardHeader(uiOutput("drop")),
  dashboardSidebar(),
  dashboardBody()
)

server <- function(input, output) { 
  values<-reactiveValues()
  values[["numvotes"]]<-1
  output$drop<-renderUI({
    dropdownMenu(type = "notifications", badgeStatus = "warning",
                 notificationItem(icon = icon("ok", lib = "glyphicon"), status = "danger",
                                  paste(values[["numvotes"]],"vote(s)")
                 )                 )
  })
  }

shinyApp(ui, server)

Answer 1

是的，这在shinydashboardwith a renderMenuand的文档中有解释dropdownMenuOutput：

https://rstudio.github.io/shinydashboard/structure.html#dynamic-content

library(shiny)
library(shinydashboard)
ui <- dashboardPage(
  dashboardHeader(dropdownMenuOutput("notif")),
  dashboardSidebar(),
  dashboardBody()
)

server <- function(input, output) { 
  values<-reactiveValues()
  values[["numvotes"]] <- 1

   output$notif <- renderMenu({
     dropdownMenu(type = "notifications", badgeStatus = "warning",
                  notificationItem(icon = icon("ok", lib = "glyphicon"), status = "danger",
                                   paste(values[["numvotes"]], "vote(s)")
                  )                 )
   })
}

shinyApp(ui, server)