RShiny- Sortable- DT::renderDataTable works on server environment console (No Error Logs) but disconnect when someone using link

[MaheshKumbhar]

I am facing issues with DT::renderDataTable with reactive function (which I am using to select Drag and Drop columns to filter selected columns to show on UI). It works on server local environment console but disconnect when I am running on RServer using link. It breaks when it was trying to populate dataframe on UI. All package versions are same and I am using R 3.6.1. There are no Error logs in console while running on locally.

This was working fine few days back, but not working now.

Below is the snippet of code.

library(dplyr)
library(shiny)
library(shinyBS)
library(sortable)
library(shinyWidgets)
library(tidyr)
library(tidyverse)
library(tidyselect)

rv <- reactiveValues(data = NULL)  

      bsModal(id = "modalExample",title =  'Select Features and Re-Arrange ', 
      trigger =  "tabBut", size = "large",

      radioButtons('radio', 'Select Action', choices = 
                      list('Default' = 'Default', 'Custom' = 'Custom'),
                      selected = 'Default', inline = T),
      bucket_list(
        header = "Select Features and Re-Arrange", group_name = "bucket_list_group",
            add_rank_list(
              text = "Drag from here",
              labels =
                c("Code","To", "Name", "From","Desc","Distance"),input_id = "rank_list_1"
            ),
            add_rank_list(
              text = "To here", labels = NULL,
              input_id = "rank_list_2"),orientation = 'horizontal')
        )

main_df <- reactive({
  selected_action = input$radio

  if(selected_action == 'Custom' ){
    result <- rv$df %>%
              select(all_of(input$rank_list_2))
  }
  else{result <- rv$df}
  return(as.data.frame(result))
})

output$content <- DT::renderDataTable({
  if(is.null(main_df())) return()      
  DT::datatable(main_df(),
    selection = 'none', filter = 'top', editable = FALSE, options = list(autoWidth = TRUE)) 
}) 

[andrie]

It's not clear to me whether this is an issue on sortable or with your shiny app.

Please can you provide a minimal reproducible example, in the form of a minimal, self-contained shiny app that displays this behaviour?

[MaheshKumbhar]

Here is the minimal code. I am using mtcars as Ref dataset to upload the file, as I mentioned the column names in bucket_list.

library(dplyr)
library(shiny)
library(shinyBS)
library(sortable)
library(shinyWidgets)
library(tidyr)
library(tidyverse)
library(tidyselect)
ui = fluidPage(

  sidebarPanel(
    fileInput("file", "Choose CSV File",  accept = c(".csv"))
  ),
  mainPanel(

    actionButton(inputId = "tabBut", label = "Customize"),

    bsModal(id = "modalExample",title =  'Select Features and Re-Arrange ', #"Data Table",
            trigger =  "tabBut", size = "large",

            radioButtons( 'radio', 'Select Action', choices = 
                            list( 'Default' = 'Default', 'Custom' = 'Custom'),
                          selected = 'Default', inline = T ),

            bucket_list(
              header = "",
              group_name = "bucket_list_group",
              add_rank_list(
                text = "Drag from here",
                labels = 
                  c("mpg","cyl", "disp",
                    "hp",'drat','wt','qsec','vs','am','gear','carb'),
                input_id = "rank_list_1"
              ),
              add_rank_list(
                text = "To here", labels = NULL,input_id = "rank_list_2"
              ),orientation = 'horizontal'
            )

    ),
    DT::dataTableOutput('data')
  ))  

server = function(input, output, session) {

  rv <- reactiveValues(data=NULL)

  df <- reactive({
    infile <- input$file
    if(is.null(infile))
      return(NULL)
    infile <- read.csv(infile$datapath,header = TRUE)
    return(infile)
  })

  main_df <- reactive({
    selected_action = input$radio

    if(selected_action == 'Custom' ){
      result <- df() %>%
        select(all_of(input$rank_list_2))

    }
    else{
      result <- df()
    }
    return(as.data.frame(result))
  })

  output$data <- DT::renderDataTable({
    if(is.null(main_df())) return()
    DT::datatable(main_df(),                    
                  filter = 'top', editable = FALSE, options = list(autoWidth = TRUE))

  })
}
shinyApp(ui, server)

[andrie]

I have simplified your code example (see below) and ran the code. It seems to me that everything works as expected.

Can you please clarify your question?

You said:

It works on server local environment console but disconnect when I am running on RServer using link

What do you mean by "RServer"? What do you mean by "using link"?

library(shiny)
library(sortable)
library(shinyBS)
library(dplyr)

ui = fluidPage(

  mainPanel(

    actionButton(
      inputId = "tabBut", 
      label = "Customize"
    ),

    bsModal(
      id = "modalExample",
      title =  'Select Features and Re-Arrange ', 
      trigger =  "tabBut", 

      radioButtons(
        'radio', 
        'Select Action', 
        choices = c('Default', 'Custom'),
        selected = 'Default', 
        inline = TRUE 
      ),

      bucket_list(
        header = "",
        group_name = "bucket_list_group",
        add_rank_list(
          text = "Drag from here",
          labels = 
            c("mpg","cyl", "disp",
              "hp",'drat','wt','qsec','vs','am','gear','carb'),
          input_id = "rank_list_1"
        ),
        add_rank_list(
          text = "To here", 
          input_id = "rank_list_2"
        ),
        orientation = 'horizontal'
      )

    ),
    DT::dataTableOutput('data')
  ))  

server = function(input, output, session) {

  df <- reactive({ mtcars })

  main_df <- reactive({
    selected_action = input$radio

    if(selected_action == 'Custom' ){
      df() %>%
        select(all_of(input$rank_list_2))

    }
    else{
      df()
    }
  })

  output$data <- DT::renderDataTable({
    req(main_df())
    DT::datatable(
      main_df(),                    
      filter = 'top'
    )

  })
}
shinyApp(ui, server)

[MaheshKumbhar]

I am having Server where R is hosted which is responsible for all applications. If I am using my development window (hosted on Server) of RStudio to modify my code, the above code works fine, if I click button of Run App. But after I saved the changes and ran from URL (link) of application the application disconnect when this particular DT::renderDataTable steps triggered.