downloadHandler在tabPanel的其他面板执行失败

Question

我闪亮的应用程序的目的是让用户导入一个 excel 文件，该应用程序将显示 table（在一些数据操作之后）。用户还可以下载 table 并将其保存为他们提供的任何名称。

代码运行良好。但是，当我决定添加另一个 tabPanel 时，下载按钮在第一个面板中工作正常，但只下载第二个面板中的 HTML 而不是导入的 table。如果不清楚，可以复制代码ad试一下运行。第二个面板只下载页面的HTML。

为什么它在第二个面板中下载了 HTML，但相同的代码在第一个面板中运行得很好？

UI:

ui <- fluidPage(
  tabsetPanel(
    tabPanel("Panel1",
             sidebarLayout(
               sidebarPanel(fileInput("df1", "Import File", accept = ".xlsx"),
                            textInput('df1sheet', 'Sheet Name (Case-Sensitive)'),
                            actionButton("update", "Update")),
               mainPanel(tableOutput("table1"), 
                         useShinyjs(),
                         actionButton("download", "Download Table"),
                         conditionalPanel(
                           "false", 
                           downloadButton("downloadtable")
                         ),
                         useShinyalert())
             )),
    tabPanel("Panel2",
             sidebarLayout(
               sidebarPanel(fileInput("df2", "Import File", accept = ".xlsx"),
                            textInput('df2sheet', 'Sheet Name (Case-Sensitive)'),
                            actionButton("update2", "Update")),
               mainPanel(tableOutput("table2"), 
                         useShinyjs(),
                         actionButton("download2", "Download Table"),
                         conditionalPanel(
                           "false", 
                           downloadButton("downloadtable2")
                         ),
                        useShinyalert())
             ))
    )
)

服务器：

server <- function(input, output) {
  
  ## Code for Panel 1
  
  df1 <- eventReactive(input$update, {
    input$df1$datapath
  })
  
  df1sheet <- eventReactive(input$update, {
    input$df1sheet
  })
  
  data1 <- reactive({
    req(input$df1)
    req(df1sheet())
    read_excel(df1(), sheet = df1sheet())
  })
  
  output$table1 <- renderTable({data1()}) 
  
  ## User can press on actionButton (id: download), and shinyalert will pop up, asking 
  ## for a filename input. After pressing confirmButton, runjs will click on 
  ## downloadButton and trigger downloadHandler.

  observeEvent(input$download, {
    shinyalert("Save as:", 
               type = "input",
               size = "xs", 
               closeOnEsc = TRUE, 
               closeOnClickOutside = TRUE, 
               showConfirmButton = TRUE, 
               showCancelButton = TRUE,
               confirmButtonText = "Save", 
               confirmButtonCol = "#0075B8",
               animation = TRUE)
  })
  
  output$downloadtable <- downloadHandler(
    filename = function () {paste(input$shinyalert, ".csv", sep = "")}, 
    content = function(file) {write.csv(data1(), file)}
  )
  
  observeEvent(input$shinyalert, {
    if (input$shinyalert != FALSE) {
      shinyjs::runjs("$('#downloadtable')[0].click();")
    }
  })
  
  ## Code for Panel 2
  
  df2 <- eventReactive(input$update2, {
    input$df2$datapath
  })
  
  df2sheet <- eventReactive(input$update2, {
    input$df2sheet
  })
  
  data2 <- reactive({
    req(input$df2)
    req(df2sheet())
    read_excel(df2(), sheet = df2sheet())
  })
  
  output$table2 <- renderTable({data2()}) 
  
  ## User can press on actionButton (id: download), and shinyalert will pop up, asking 
  ## for a filename input. After pressing confirmButton, runjs will click on 
  ## downloadButton and trigger downloadHandler.

  observeEvent(input$download2, {
    shinyalert("Save as:", 
               type = "input",
               size = "xs", 
               closeOnEsc = TRUE, 
               closeOnClickOutside = TRUE, 
               showConfirmButton = TRUE, 
               showCancelButton = TRUE,
               confirmButtonText = "Save", 
               confirmButtonCol = "#0075B8",
               animation = TRUE,
               inputId = "shinyalert2")
  })
  
  output$downloadtable2 <- downloadHandler(
    filename = function () {paste(input$shinyalert2, ".csv", sep = "")}, 
    content = function(file) {write.csv(data2(), file)}
  )
  
  observeEvent(input$shinyalert2, {
    if (input$shinyalert2 != FALSE) {
      shinyjs::runjs("$('#downloadtable2')[0].click();")
    }
  })
}

Answer 1

您在 conditionalPanel 中的第二个 downloadButton 似乎是问题所在。

替换

                 conditionalPanel(
                   "false",
                   downloadButton("downloadtable2")
                 ),

有了这个

downloadButton("downloadtable2", "Download", style = "visibility: hidden;")

downloadHandler在tabPanel的其他面板执行失败

downloadHandler fails to execute in other panels of tabPanel

r

shiny

tabpanel