使用Shinydashboard在闪亮的应用程序中未显示输出

Question

我在menuItem有一个sliderInput ，可以移动它，并且需要在屏幕上显示所选的数字。 下面是代码：

library(shiny)
library(shinydashboard)    

sidebar <- dashboardSidebar(
            sidebarMenu(
                # Setting id makes input$tabs give the tabName of currently-selected tab
                menuItem("Dashboard", tabName = "dashboard", icon = icon("dashboard"),
                         sliderInput("slider", "Slider Input", min = 0, max = 10, step = 1, value = 5))
                )
            )


body <- dashboardBody(
        tabItems(
            tabItem("dashboard", textOutput("Dashboard"))
            )
    )


ui <- dashboardPage(
    dashboardHeader(),
    sidebar,
    body)

server <- function(input, output, session) {
    output$Dashboard <- renderText({
        paste("You've selected:", input$slider)
    })
}

shinyApp(ui, server)

理想情况下，我应该看到选择的号码，但是那不会发生，无法弄清楚我要去哪里。

Answer 1

当menuItem内有输入时，似乎有问题。 你可以做：

sidebar <- dashboardSidebar(
  sidebarMenu(
    id="tabs",
    menuItem("Dashboard", tabName = "dashboard", icon = icon("dashboard")), 
    conditionalPanel(
      "input.tabs == 'dashboard'",
      sliderInput("slider", "Slider Input", 
                  min = 0, max = 10, step = 1, value = 5))
  )
)

Answer 2

以下是有效的代码。

library(shiny)
library(shinydashboard)
ui <- dashboardPage(
  dashboardHeader(),
  dashboardSidebar(
    sidebarMenu(
      menuItem("Dashboard", tabName = "dashboard", icon = icon("dashboard"),
               sliderInput("slider", "Slider Input", min = 0, max = 10, step = 1, value = 5))
    )
  ),
  dashboardBody(
    textOutput("dashboard")

  ))

server <- function(input, output, session) {
  output$dashboard <- renderText({
    paste("You've selected:", input$slider)
  })
}

shinyApp(ui, server)