jqPagination for ajax filtered products

Question

I'm trying to use jqPagination to paginate products which can be filtered using ajax. All works fine until this: let's say I have 20 products, 5 products per page, meaning 4 pages. Now, my issue comes up if I filter the products and get (ie) 2 pages only and I was on page 4 when I was applying the filter. The jqPagination input says Page 4 of 4. (if I were on page 1 or 2 when I was applying the ajax filter works fine). Here's the jquery code I use:

$(document).ready(function() {
  var records_per_page = 5;
  var records = $('#products div.productItem').length;
  var pages = Math.ceil(records/records_per_page);

  $('#products div.productItem').slice(records_per_page).hide();

  $('.pagination').jqPagination({
    max_page    : pages,
    page_string : '{current_page} of {max_page}',
    paged       : function(page) {

      var start_rec = records_per_page * (page-1);
      var stop_rec = start_rec+records_per_page;

      $('#products div.productItem').hide();
      $('#products div.productItem').slice(start_rec,stop_rec).show();
    }
  });
});

---

$.ajax({
        url: "modules/modules/_ajax-filters.php",
        data: { marke: selBrandStr, lieferung: selDeliveryStr, minPrice: minPriceFilter, maxPrice: maxPriceFilter, pag: pag },
        type:"post",
        async: false,
        cache: false,
        dataType: "html",
        success: function (html) {
            $('#products').html('');
            $('#products').html(html);

            var records_per_page = 5;
            var records = $('#products div.productItem').length;
            var pages = Math.ceil(records/records_per_page);

            $('.pagination').jqPagination('option', 'max_page', pages);
            $('.pagination').jqPagination('option', 'current_page', 1);
        }
});

Answer 1

I found myself the answer... I had to change between them the lines

$('.pagination').jqPagination('option', 'max_page', pages);
$('.pagination').jqPagination('option', 'current_page', 1);

and become:

$('.pagination').jqPagination('option', 'current_page', 1);
$('.pagination').jqPagination('option', 'max_page', pages);

and now works.