闪亮文档中的rPivotTable:CSV下载失败

时间:2017-02-09 16:24:34

标签: r download shiny pivot-table flexdashboard

这是我的第一次堆栈溢出问题,如果您认为我没有正确完成,请告诉我。

我正在使用flexdashboard和闪亮的模块来创建交互式文档,我想要包含一个rPivotTable和一个下载按钮,它将数据透视表下载为csv。此csv应包含用户更改rPivotTable输入时创建的数据表。

我已经使用了其他堆栈溢出答案(例如这里的那个:download rpivotTable ouput in shiny)来编写代码,我觉得我很接近。但是,当我运行下面的代码时,请在我的Chrome浏览器中打开交互式文档,然后单击“下载”按钮,发生错误。 Chrome上页面底部弹出的小下载栏不显示csv文件,而是显示消息“失败 - 服务器问题”。要查看是否生成了aSummaryTable,我在UI中包含了输出(DT::dataTableOutput(ns("aSummaryTable"))),但是当我运行Rmd时,生成的文档只显示rPivotTable和下载按钮。

我很擅长闪亮而且从未使用过java脚本,所以我真的不理解代码的onRefresh部分:

onRefresh = htmlwidgets::JS("function(config) { 
                   Shiny.onInputChange('myData', document.getElementById('pivot').innerHTML); 
                   }")

这是我完整的(希望可重现的)Rmarkdown代码。 (如果您有任何想法,我可能会收到此错误以及如何解决此问题,我将非常感激)

---
title: "Report"
output: 
  flexdashboard::flex_dashboard:
    theme: simplex
    orientation: rows
social: menu
source_code: embed
runtime: shiny
---

```{r setup, include=FALSE}

## Installing packages if not already installed & require(package)
usePackage <- function(p) {
  if (!is.element(p, installed.packages()[,1]))
    install.packages(p, dep = TRUE)
  require(p, character.only = TRUE)
}

usePackage('flexdashboard')
usePackage('plotly')
usePackage('data.table')
usePackage('rpivotTable')
usePackage('knitr')
usePackage('Rcpp')
usePackage('stringi')
usePackage('tidyr')
usePackage('chron')
usePackage('DT')
usePackage('caroline')
usePackage('rvest')
usePackage('htmlwidgets')

```


Demo
=========================

### Demo

```{r, include=FALSE}

# UI function
demoUI <- function(id) {
  ns <- NS(id)
  fillCol(height = 600, flex = c(NA, 1),

        DT::dataTableOutput(ns("aSummaryTable")),
        rpivotTableOutput(ns("pivot"))

       ,
       inputPanel(
         downloadButton(ns('downloadData'), 'Download ')
       )
  )
}

# Server function
demoServer <- function(input, output, session) {

  output$pivot <- renderRpivotTable({
   library(htmlwidgets)
   library(rpivotTable)
   rpivotTable(data = datasets::mtcars, aggregatorName = "Count", rendererName = "Bar Chart",
                onRefresh = htmlwidgets::JS("function(config) { 
                           Shiny.onInputChange('myData', document.getElementById('pivot').innerHTML); 
                           }"))

   })

  # Clean the html and store as reactive
  summarydf <- eventReactive(input$myData,{
    library(htmlwidgets)
    input$myData %>% 
       read_html %>% 
       html_table(fill = TRUE) %>% 
        .[[2]]

  })

  # show df as DT::datatable
  output$aSummaryTable <- DT::renderDataTable({
      DT::datatable(summarydf(), rownames = FALSE)
  })


  output$downloadData <- downloadHandler(
    filename <- "rpivottable_mtcars.csv",
    # This function should write data to a file given to it by
    # the argument 'file'.
    content = function(file) {
      # Write to a file specified by the 'file' argument
      write.csv(summarydf(), file,
        row.names = FALSE)
    }
  )

}
```

```{r}
demoUI("demo")
callModule(demoServer, "demo")
```
编辑:我自己设法解决了这个问题。在使用Shiny Modules时,似乎无法将rPivotTable切片的数据从客户端发送回服务器。但是,当使用内联应用程序或外部应用程序时,它确实有效。 这是一个可重现且最终正常工作的代码(以防任何人遇到此问题):

---
title: "Report"
output: 
  flexdashboard::flex_dashboard:
    theme: simplex
    orientation: rows
social: menu
source_code: embed
runtime: shiny
---

```{r setup, include=FALSE}

## Installing packages if not already installed & require(package)
usePackage <- function(p) {
  if (!is.element(p, installed.packages()[,1]))
    install.packages(p, dep = TRUE)
  require(p, character.only = TRUE)
}

usePackage('flexdashboard')
usePackage('plotly')
usePackage('data.table')
usePackage('rpivotTable')
usePackage('knitr')
usePackage('Rcpp')
usePackage('stringi')
usePackage('tidyr')
usePackage('chron')
usePackage('DT')
usePackage('caroline')
usePackage('rvest')
usePackage('htmlwidgets')

```


Demo
=========================

### Demo

```{r}
shinyApp(
  ui = fillPage(
    fillCol(flex = c(NA, 1), 
        DT::dataTableOutput("aSummaryTable"),
        rpivotTableOutput("pivotTab")
       ,
       inputPanel(
         downloadButton('downloadData', 'Download ')
    )
  )),


  server = function(input, output, session) {

  output$pivotTab <- renderRpivotTable({
    rpivotTable(data = datasets::mtcars, aggregatorName = "Count", rendererName = "Table",
                onRefresh = htmlwidgets::JS("function(config) {Shiny.onInputChange('myData', document.getElementById('pivotTab').innerHTML);}")
    )
  })

  # Clean the html and store as reactive
  summarydf <- eventReactive(input$myData,{
    input$myData %>% 
       read_html %>% 
       html_table(fill = TRUE) %>% 
        .[[2]]

  })

    # show df as DT::datatable
  output$aSummaryTable <- DT::renderDataTable({
      DT::datatable(summarydf(), rownames = FALSE)
  })


  output$downloadData <- downloadHandler(
    filename <- "rpivottable_mtcars.csv",
    content = function(file) {
      write.csv(summarydf(), file,
                row.names = FALSE)
    }
  )

}

)
```

0 个答案:

没有答案