从Shiny中的renderDataTable()下载过滤后的数据

时间:2018-01-29 03:08:41

标签: r shiny

我正在尝试允许用户从Shiny中的renderDataTable()下载过滤后的数据。例如,在下面的MWE中,用户应该能够转到“查看整个数据表”选项卡,例如,只为Variable2选择“蓝色”值。然后,他们应该能够点击“下载过滤后的数据”按钮并查看过滤后的数据。

但是,由于代码如下,当用户点击“下载过滤数据”按钮时,他们会下载整个(未过滤的)数据。我已经看到了其他示例(例如R - Download Filtered Datatable)并尝试将它们合并到我的代码中,但仍然卡住了。任何建议都会很有帮助。谢谢。

# Load packages
library(shiny)
library(tidyr)
library(dplyr)

# Load data
data_table <- data.frame(Variable1 = sample(LETTERS, 1000, replace=TRUE), Variable2 = sample(c("Orange","Green","Blue","Pink"), 1000, replace=TRUE), Variable3 = sample(c("Square","Triangle","Circle"), 10000, replace=TRUE))

# Define UI
ui <- fluidPage(
  tabsetPanel(type = "tabs", id="tabs",
    tabPanel("Column Summary", value=2,
       sidebarPanel(uiOutput("sidebar_summary")),
       verbatimTextOutput("summary")),
    tabPanel("See Whole Data Table", value=5,
       downloadButton('downLoadFilter',"Download the filtered data"),
       verbatimTextOutput("Raw"),
       DT::dataTableOutput('ex1'))
  )
)

# Define server logic
server <- function(input, output) {

  output$sidebar_summary <- renderUI({
    if (input$tabs == 2){
    print("This is a tab with information.")
    }
  })

  thedata <- reactive(data_table)

  output$Raw <- renderPrint({
    if(input$tabs == 5){
      output$ex1 <- DT::renderDataTable(DT::datatable(thedata(), filter = 'top',escape = FALSE, options = list(pageLength = 10, scrollX='500px',autoWidth = TRUE)))
    }
  })

  output$downLoadFilter <- downloadHandler(
    filename = function() {
      paste('Filtered data-', Sys.Date(), '.csv', sep = '')
    },
    content = function(file){
      write.csv(thedata(),file)
    }
  )
}

# Create Shiny object
shinyApp(ui = ui, server = server)

1 个答案:

答案 0 :(得分:3)

从您提供的link复制示例似乎有效。

您只需要替换

output$downLoadFilter <- downloadHandler(
    filename = function() {
      paste('Filtered data-', Sys.Date(), '.csv', sep = '')
    },
    content = function(file){
      write.csv(thedata(),file)
    }
  )
使用

在服务器中

 output$downLoadFilter <- downloadHandler(
    filename = function() {
      paste('Filtered data-', Sys.Date(), '.csv', sep = '')
    },
    content = function(file){
      write.csv(thedata()[input[["ex1_rows_all"]], ],file)
    }
  )

这就是诀窍。希望它有所帮助!