AnilGoyal's questions

我观察到一种奇怪的行为。映射cyl变量（来自 mtcars 数据）生成了具有 5 个不同级别的图表，alpha尽管实际上只有三个级别可用？

这是 bug 吗？还是我遗漏了什么？

library(tidyverse)
count(mtcars, cyl)
#>   cyl  n
#> 1   4 11
#> 2   6  7
#> 3   8 14

ggplot(mtcars, aes(x = wt, y = mpg)) +
  geom_point(aes(alpha = cyl), size = 4)

^{创建于 2024-08-24，使用reprex v2.1.1}

我制作了一个闪亮的应用程序（在闪亮的仪表板中），其中包含许多菜单和子菜单项。就像下面的树结构

    sidebarMenu(
      menuItem("Item 1", tabName = "item1", icon = icon("dashboard")),
      menuItem("Item 2", tabName = "item2", icon = icon("th"),
               menuSubItem("Subitem1", tabName = "subitem1"),
               menuSubItem("Subitem2", tabName = "subitem2")),
      menuItem("Item 3", tabName = "item3", icon = icon("bolt"),
               menuSubItem("Subitem3", tabName = "subitem3"),
               menuSubItem("Subitem4", tabName = "subitem4")
               )
    )

在第一页我有四个操作按钮。我希望当单击任何操作按钮时，可以打开相应的“subitem#”页面。我无法做到这一点shinydashboard::updateTabItems。请帮忙。示例代码/应用程序是

library(shiny)
library(shinydashboard)

ui <- dashboardPage(
  dashboardHeader(title = "Dynamic Tab Example"),
  dashboardSidebar(
    sidebarMenu(
      menuItem("Item 1", tabName = "item1", icon = icon("dashboard")),
      menuItem("Item 2", tabName = "item2", icon = icon("th"),
               menuSubItem("Subitem1", tabName = "subitem1"),
               menuSubItem("Subitem2", tabName = "subitem2")),
      menuItem("Item 3", tabName = "item3", icon = icon("bolt"),
               menuSubItem("Subitem3", tabName = "subitem3"),
               menuSubItem("Subitem4", tabName = "subitem4")
               )
    )
  ),
  dashboardBody(
    tabItems(
      tabItem(
        "item1",
        actionButton("button1", "navigate to subitem1"),
        actionButton("button2", "navigate to subitem2"),
        actionButton("button3", "navigate to subitem3"),
        actionButton("button4", "navigate to subitem4")
      ),
      tabItem("subitem1",
              box(
                title = "Item 1",
                actionButton("button1", "Button 1")
              )
      ),
      tabItem("subitem2",
              box(
                title = "Item 2 Content",
                "This is the content for Item 2."
              )
      ),
      tabItem("subitem3",
              box(
                title = "Item 3 Content",
                "This is the content for Item 3."
              )
      ),
      tabItem("subitem4",
              box(
                title = "Item 4 Content",
                "This is the content for Item 4."
              )
      )
    )
  )
)

server <- function(input, output, session) {
  

}

shinyApp(ui, server)