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))
               )
    })