R闪亮的conditionalPanel显示两个条件 [英] R shiny conditionalPanel displaying both conditions

问题描述

我正在尝试使用多标签应用，我希望第二个标签的页面布局以第一个面板的输入为条件。基本上，如果第一个面板中的值为1，我希望第二个面板显示一组文件输入（如果用户在第一个面板中输入值2，那么我希望第二个面板显示2个文件输入）。目前，我的代码同时显示了这两种情况，但我不确定为什么。参见下面的可复制代码。

I am trying to a multi tab app, I want the the second tab's page layout to be conditional on an input from the first panel. Basically if the value in the first panel is 1 I want the second panel to display 1 set of file inputs if the user puts in the value 2 in the first panel then I want the second panel to display 2 file inputs. Currently my code displays both conditions, and I am unsure why. See the reproducible code below.

ui = 
navbarPage("Page Title",
  tabPanel("Panel 1",
    sidebarPanel(
        ## Add Name,
        ## Number of surveys analysising
        numericInput("n_values", "Number of columns in next panel:", 1, min = 1, max = 2)
    ),
    mainPanel(
      tags$div(
        h2("Home Page") 
      )
    )
   ),
    tabPanel("Panel 2",
      conditionalPanel(condition = "input.n_values == 1",
        fixedPage(theme = "flatly",
          fixedRow(
            column(2,"First Column",
              fileInput("File1", "Choose a CSV files",accept = c("text/csv","text/comma-separated-values",".csv"), multiple = F),
              p("Click the button to check the data was read in correctly")
            ),
            fixedRow(
              column(12,
                verbatimTextOutput("errorText")
              )
            )    
          )
        )
      ),
      conditionalPanel(condition = "input.n_values == 2",
        fixedPage(theme = "flatly",
          fixedRow(
            column(2,"First Column",
              fileInput("File1", "Choose a CSV files",accept = c("text/csv","text/comma-separated-values",".csv"), multiple = F),
              p("Click the button to check the data was read in correctly")
            ),
            column(2,"Second Column",
              fileInput("File2", "Choose a CSV files",accept = c("text/csv","text/comma-separated-values",".csv"), multiple = F),
              p("Click the button to check the data was read in correctly")
            ),          
            fixedRow(
              column(12,
                verbatimTextOutput("errorText")
              )
            )    
          )
        )
      )      
    )  
  )

server = function(input, output,session) {
  ## Call the error message function and print
  output$errorText <- renderText({
    validate(
      need(!is.null(input$File1)
             , 'You need to input the files before we can validate the data. Please select all the necessary files.')
      )
  })
} 

shinyApp(ui, server)

推荐答案

这是因为您有 verbatimTextOutput（ errorText）在您的用户界面中两次。您无法在Shiny中做到这一点。输出只能包含在一个地方。

That's because you have verbatimTextOutput("errorText") twice in your UI. You can't do that in Shiny. An output must be included at one place only.

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