How to make the horizontal scrollbar visible in DT::datatable

Question

Using R shiny & DT package, I am creating certain tables. The number of columns vary as per user input & is not fixed. I have included the following code snippet to

Answer 1

I would have done this way also:

datasetInput1 <- reactive({
      infile <- input$file1
      if(is.null(infile))
        return(NULL) 
      else
        m <- read.csv(infile$datapath, header = input$header)
        return ( DT::datatable(m, extensions = 'Scroller', options = list(deferRender = F, dom = 't',
                                                                      columnDefs = list(list(className = 'dt-center',
                                                                                             targets = 5)),
                                                                     scrollY = 300, scroller = TRUE, scrollX = T,
                                                                     pageLength = 5))
               )
    })

Answer 2

Try this:

DT::datatable(sta, options = list(
  pageLength=50, scrollX='400px'), filter = 'top')

Answer 3

I don't think you can (or should) force a scrollbar easily if you don't need one, but the above code works fine for me, it shows a scrollbar when the page initializes. Maybe the problem is with the data or something else.

Here's a minimal example that has a horizontal scrollbar on page load

runApp(shinyApp(
  ui = fluidPage(
    DT::dataTableOutput("results", width = 300)
  ),
  server = function(input, output, session) {
    output$results <- DT::renderDataTable(
      mtcars,
      options = list(scrollX = TRUE)
    )
  }
))