在R中使用切换开关时如何默认打开侧边栏

Question

我创建了以下闪亮的应用程序。该应用程序由以下部分组成

导入必要的库

 library(shiny)
 library(shinyjs)

接下来我们创建美国。请注意，我们正在使用材质切换功能添加切换侧边栏选项，如下所示

 # Define UI for app that draws a histogram ----
 ui <- fluidPage(  
# App title ----
titlePanel("Hello Shiny!"),
useShinyjs(), navbarPage(materialSwitch(inputId = "toggleSidebar",label = "", 
value = FALSE, status = "success")),
# Sidebar layout with input and output definitions ----
sidebarLayout(div( id ="Sidebar",
# Sidebar panel for inputs ----
sidebarPanel(     
  # Input: Slider for the number of bins ----
  sliderInput(inputId = "bins",
              label = "Number of bins:",
              min = 1,
              max = 50,
              value = 30))),

    # Main panel for displaying outputs ----
   mainPanel( # Output: Histogram ----
  plotOutput(outputId = "distPlot")
   )))

接下来我们如下创建一个服务器

  # Define server logic required to draw a histogram ----
 server <- function(input, output) {
   output$distPlot <- renderPlot({
   x    <- faithful$waiting
    bins <- seq(min(x), max(x), length.out = input$bins + 1)
    hist(x, breaks = bins, col = "#75AADB", border = "white",
     xlab = "Waiting time to next eruption (in mins)",
     main = "Histogram of waiting times")})



    observeEvent(input$toggleSidebar, {
        shinyjs::toggle(id = "Sidebar")
    })}

我们现在运行应用程序。

 shinyApp(ui, server)

当应用程序运行时，包含带有 bin 数量的滑块的侧边栏会被折叠，因为侧边栏默认是折叠的。按下拨动开关也可以访问相同的内容。

是否可以默认打开侧边栏，然后单击切换开关时折叠相同

谢谢

Answer 1

您可以使用toggles condition 参数来确定侧边栏是显示还是隐藏：

library(shiny)
library(shinyjs)
library(shinyWidgets)

# Define UI for app that draws a histogram ----
ui <- fluidPage(  
  # App title ----
  titlePanel("Hello Shiny!"),
  useShinyjs(), navbarPage(materialSwitch(inputId = "toggleSidebar",label = "", 
                                          value = TRUE, status = "success")),
  # Sidebar layout with input and output definitions ----
  sidebarLayout(div( id ="Sidebar",
                     # Sidebar panel for inputs ----
                     sidebarPanel(     
                       # Input: Slider for the number of bins ----
                       sliderInput(inputId = "bins",
                                   label = "Number of bins:",
                                   min = 1,
                                   max = 50,
                                   value = 30))),

                # Main panel for displaying outputs ----
                mainPanel( # Output: Histogram ----
                           plotOutput(outputId = "distPlot")
                )))

# Define server logic required to draw a histogram ----
server <- function(input, output) {
  output$distPlot <- renderPlot({
    x    <- faithful$waiting
    bins <- seq(min(x), max(x), length.out = input$bins + 1)
    hist(x, breaks = bins, col = "#75AADB", border = "white",
         xlab = "Waiting time to next eruption (in mins)",
         main = "Histogram of waiting times")})

  observeEvent(input$toggleSidebar, {
    shinyjs::toggle(id = "Sidebar", condition = input$toggleSidebar)
  })
  }

shinyApp(ui, server)