Question

我正在开发一个闪亮的应用程序，我试图根据复选框的输入来过滤数据框，就是，如果单击复选框，则过滤数据框，否则数据框保持不变。如果选中此复选框，则只能在“ CANONICAL”列中选择值为“ YES”的那些行

我读过类似的问题（例如：Condition Filter in dplyr based on Shiny input），但我无法解决我的问题。

我的代码如下：

library(shiny)
library(DT) 
library(dplyr)
library(shinyWidgets)

options(shiny.maxRequestSize = 100*1024^2)

ui <- fluidPage(

  sidebarLayout(

    sidebarPanel(
      fileInput("file1", "Upload your File",
                multiple = FALSE,
                accept = c("text/csv",
                           "text/comma-separated-values,text/plain",
                           ".csv")),

      pickerInput("Consequence", "Consequence:",   
                  choices = c( "x", "y","z"), 
                  options = list(`actions-box` = TRUE),
                  multiple = TRUE ),
      prettyCheckbox(inputId= "CANONICAL", label = "CANONICAL", value =              FALSE, outline= TRUE, fill = TRUE, bigger = TRUE, status = 'success',width = NULL),

    mainPanel(
      dataTableOutput("contents")
    )

  ))

server <- function(input, output) {

  output$contents <- renderDT({
    req(input$file1)
    df <- read.delim(input$file1$datapath,
                     header = TRUE,
                     sep = '\t') 

    # Apply filters 
    df <- df %>% 
    filter(Consequence == input$Consequence ) %>%
    { if (input$CANONICAL) filter( CANONICAL == 'YES') }

return(df)

shinyApp(ui, server)

如果条件为(input$CANONICAL)，(input$CANONICAL == TRUE)或(!is.null(input$CANONICAL))，则最后一个过滤器也不起作用。我也尝试过在一个单独的反应函数中定义条件，但是似乎没有任何作用。

Answer 1

请下次尝试添加带有清晰r代码的可重现示例。

在当前形式中，您不能在管道运算符之后使用if条件。

我通常在过滤器语句中添加if条件。请参见下面的代码。在这种情况下，您必须提供else条件，否则代码将无法工作。

请注意，我已更改您的示例以使其可重现。

library("shiny")
library(DT)
library(dplyr)
library(shinyWidgets)

## Only run examples in interactive R sessions

shinyApp(

    # options(shiny.maxRequestSize = 100*1024^2)

    ui = fluidPage(

        sidebarLayout(

            sidebarPanel(

                pickerInput("Consequence", "Consequence:",   
                            choices = c( "x", "y","z"), 
                            options = list(`actions-box` = TRUE),
                            selected = "x",
                            multiple = TRUE ),

                prettyCheckbox(inputId = "CANONICAL",
                               label = "CANONICAL",
                               value = FALSE,
                               outline = TRUE,
                               fill = TRUE,
                               bigger = TRUE,
                               status = 'success',width = NULL)),


            mainPanel(
                dataTableOutput("contents")
            )

            )
        ),

        server = function(input, output) {

            df <- data.frame(Consequence = c(rep("x",4),rep("y",4),rep("z",4)),
                          CANONICAL = rep(c("YES","NO"),6),
                             x1 = c(5,6,7,3,4,5,2,3,4,2,1,7),
                             x2 = c(1,2,3,2,3,2,1,4,6,7,3,4),
                             x3 = c(12,43,64,34,93,16,32,74,84,89,45,67)
                          )


            output$contents <- renderDT({

                print(input$CANONICAL)

            df <- df %>% 
                filter(Consequence == input$Consequence ) %>%
                filter(if (input$CANONICAL == TRUE) CANONICAL == "YES" else !is.na(CANONICAL))

            return(df)
            })
        }
)

如何根据闪亮应用程序中复选框的输入来对数据框进行子集设置？

1 个答案: