Shiny DT: How to type page number manually?

Question

I have a long table with more than 100 pages. I need to add some functionality so that the user may type the number of page, for example 50, and go to this page easily. This problem arises with very long tables when it is necessary to open some page which is in the middle of the interval. In this case the user have to click several times on the 'Previous' or 'Next' button.

In the example below I can't open on one click 8'th page.

if (interactive()) {
  library(shiny)
  library(DT)
  shinyApp(
    ui = fluidPage(fluidRow(column(12, DTOutput('tbl')))),
    server = function(input, output) {
      output$tbl = renderDT(
        iris, options = list(lengthChange = FALSE)
      )
    }
  )
}

Answer 1

library(shiny)
library(DT)

shinyApp(
  ui = fluidPage(
    fluidRow(
      div(style = "display:inline-block;", 
          numericInput("page", "Go to page:", value = 1, min = 1)),
      div(style = "display:inline-block;", 
          actionButton("gotopage", "Go"))
    ),
    fluidRow(
      column(12, DTOutput('tbl'))
    )
  ),
  server = function(input, output) {
    output$tbl = renderDT({
      datatable(
        iris, 
        callback = JS(c(
          "$('#gotopage').on('click', function(){",
          "  var page = parseInt($('#page').val())-1;",
          "  table.page(page).draw('page');",
          "});"
        ))
      )
    })
  }
)

---

Another option:

library(shiny)
library(DT)

shinyApp(
  ui = fluidPage(
    tags$head(tags$style(".pagination {float: right;}")),
    fluidRow(
      div(id="pagination", 
          div(style = "display:inline-block;", 
              tags$a(id = "first", style = "cursor: pointer;", "First")),
          div(style = "display:inline-block;", 
              tags$a(id = "previous", style = "cursor: pointer;", " Previous")),
          div(style = "display:inline-block;", 
              tags$input(id="page", type="number", class="input-sm", value="1", min="1")
          ),
          div(style = "display:inline-block;", 
              tags$span(id = "of")),
          div(style = "display:inline-block;", 
              tags$a(id = "next", style = "cursor: pointer;", "Next ")),
          div(style = "display:inline-block;", 
              tags$a(id = "last", style = "cursor: pointer;", "Last"))
      )
    ),
    fluidRow(
      column(12, DTOutput('tbl'))
    )
  ),
  server = function(input, output) {
    output$tbl = renderDT({
      datatable(
        iris, options = list(
          dom = "lfrti<'pagination'>", 
          initComplete = JS(c(
            "function(settings, json){",
            "  var table = settings.oInstance.api();",
            "  var pageinfo = table.page.info();",
            "  $('#of').text('of ' + pageinfo.pages);",
            "}"
          ))
        ),
        callback = JS(c(
          "$('div.pagination').append($('#pagination'));",
          "$('#first').on('click', function(){", 
          "  table.page('first').draw('page');",
          "  $('#page').val(1);",
          "});",
          "$('#previous').on('click', function(){", 
          "  table.page('previous').draw('page');",
          "  $('#page').val(table.page.info().page + 1);",
          "});",
          "$('#next').on('click', function(){", 
          "  table.page('next').draw('page');",
          "  $('#page').val(table.page.info().page + 1);",
          "});",
          "$('#last').on('click', function(){", 
          "  table.page('last').draw('page');",
          "  $('#page').val(table.page.info().pages);",
          "});",
          "$('#page').on('change', function(){",
          "  var page = parseInt($('#page').val());",
          "  if(!isNaN(page)){ table.page(page-1).draw('page'); }",
          "});"
        ))
      )
    })
  }
)