CODEWITHSUNDEEP
rshiny
SL42
SL42

Reputation: 221

How to get R shiny to download the data from my renderDataTable function?

So I have been having a hard time trying to get the data in my renderDataTable function to work with the downloadHandler function. So the problem that I am having is when I run the shiny application, hit the checkbox for the filter option, select the variable sex 0(female), and download the data, I get all of the observations as supposed to the filtered data.

Sample data:

"","age","sex","bmi","children","smoker","region","expenses"
"1",19,"0",27.9,0,"1","0",16884.92
"2",18,"1",33.8,1,"0","1",1725.55
"3",28,"1",33,3,"0","1",4449.46
"4",33,"1",22.7,0,"0","2",21984.47
"5",32,"1",28.9,0,"0","2",3866.86
"6",31,"0",25.7,0,"0","1",3756.62
"7",46,"0",33.4,1,"0","1",8240.59
"8",37,"0",27.7,3,"0","2",7281.51
"9",37,"1",29.8,2,"0","3",6406.41
"10",60,"0",25.8,0,"0","2",28923.14
"11",25,"1",26.2,0,"0","3",2721.32
"12",62,"0",26.3,0,"1","1",27808.73
"13",23,"1",34.4,0,"0","0",1826.84
"14",56,"0",39.8,0,"0","1",11090.72
"15",27,"1",42.1,0,"1","1",39611.76
"16",19,"1",24.6,1,"0","0",1837.24
"17",52,"0",30.8,1,"0","3",10797.34
"18",23,"1",23.8,0,"0","3",2395.17
"19",56,"1",40.3,0,"0","0",10602.39
"20",30,"1",35.3,0,"1","0",36837.47

ui.R:

      tabItem(tabName = "data",
          h2("Insurance Data Page"),
          checkboxInput("dataset","Filter option:"),
          conditionalPanel(
            condition = "input.dataset==true",
            selectInput("sex", "Variable sex:", levels(insurance_data_update$sex))
          ),
          dataTableOutput("data_read"),
          downloadButton("data_saved","Download this data")
      ),

server.R:

  #Filtering factor columns
  getData <- reactive({
  newData <- insurance_data_update #%>% filter(sex == input$sex)#, smoker==input$smoker, region==input$region)
  })

  # Reading in the data
  output$data_read = renderDataTable({
  #newData <- getData()
  if(input$dataset==TRUE){
     if(input$sex==0){
        #newData <- newData %>% filter(sex==input$sex)
        getData() %>% filter(sex==input$sex)
        getData()
       #newData
     }else{
       #newData <- newData %>% filter(sex==input$sex)
       #newData
       getData() %>% filter(sex==input$sex)
       getData()
     }
  }else{
     #newData
     getData()
  }
  output$data_saved = downloadHandler(
     filename="insurance.csv",
     content = function(file){
       write.csv(getData(), file)
     }
  )

I am not entirely sure what I am doing wrong.

Any help is greatly appreciated.

Upvotes: 0

Views: 454

Answers (2)

TTS
TTS

Reputation: 1928

I think this should work.

Edit: There are different inputs that can be taken from datatables, and this will export the data (getData()) as it appears in the datatable - meaning any filtering you do on the table will be reflected as well as filtering performed on the data fed to DT. The output for the datatable, output$data_read, is what feeds into the input value data_read_rows_all, which is basically DT ouput name+ _rows_all.

  output$data_saved = downloadHandler(
     filename="insurance.csv",
     content = function(file){
       write.csv(getData()[input[["data_read_rows_all"]], ], file)
     }

Check here for more info!

Upvotes: 1

MrFlick
MrFlick

Reputation: 206197

Create a new reactive element that just shows your table data and then use that for the table and for the download. For example

#Filtering factor columns
getData <- reactive({
  insurance_data_update
})

tableData <- reactive({
 if(input$dataset==TRUE){
     if(input$sex==0){
        getData() %>% filter(sex==input$sex)
     } else {
       getData() %>% filter(sex==input$sex)
     }
  }else{
     getData()
  }
})
 
output$data_read = renderDataTable({
  tableData()
})

output$data_saved = downloadHandler(
   filename="insurance.csv",
   content = function(file){
     write.csv(tableData(), file)
   }
)

Upvotes: 3

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