Question

这里有新亮点。我正在创建一个仪表板，并有不同的类别和子类别。我想做的是如下：

当屏幕加载时，我希望所有类别和子类别都可供选择，但如果我选择类别＆＃39; 1＆＃39;，那么只有＆＃39; sub1＆＃39;和＆＃39; sub2＆＃39;应该可供选择。所以就像它被类别过滤一样。我如何在闪亮的服务器文件中实现这一点？我的代码的一个简短示例如下:(服务器是sudo代码）

UI -->     
    dashboardSidebar(
        sidebarMenu(
          menuItem("CSF2", tabName = "CSF2", icon=icon("bar-chart")),
            selectInput("category", "Select a category", c("1", "2"),
            selectInput("subcategory", "Select a subcategory",       c("sub1", "sub2", "sub3" "sub4"),
        )),


server--->
shinyServer(function(input,output){
    if (category_selected == 1){subcategoryOptions= c(sub1,sub2)}
    if (category_selected == 2){subcategoryOptions= c(sub3,sub4)}

}

Answer 1

library(shiny)
library(shinydashboard)

UI <- dashboardSidebar(
  sidebarMenu(
    menuItem("CSF2", tabName = "CSF2", icon = icon("bar-chart")),
    selectInput("category", "Select a category", c("1", "2")),
    selectInput("subcategory", "Select a subcategory",       
                c("sub1", "sub2", "sub3", "sub4"))
  )
)


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

  observe({
    updateSelectInput(
      session, "subcategory", "Select a subcategory",
      choices = switch(input$category,
        "1" = c("sub1", "sub2"),
        "2" = c("sub3", "sub4"))
    )
  })

}

shinyApp(UI, server)

R闪亮仪表板中的反应下拉菜单

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