Custom filters don't work with ajax.data. Json created by django-datatables-views

mailman_shu

I use djando-datatables-view in order to create the json data.
My data is displayed fine. Sorting works either. I created additional <input> to search data only in the second column of my table. When I'm writing something in 'search-input-text' i can see the processing modal but table rows aren't filtered at all.
I can't find any information about how to do custom filters with ajax.data. I am a newbie and I've been spending three days to find the solution. Please. help:) My code:

      $(document).ready(function() {
        var dataTable = $('#datatabletest').DataTable({
          "processing": true,
          "serverSide": true,
          "ajax":{
      "url" :"http://...tojson",
      "type" : "get",
     error: function(){  // error handling
        $(".datatabletest-error").html("");
        $("#datatabletest").append('<tbody class="datatabletest-error"><tr><th colspan="3">ERROOOOR</th></tr></tbody>');
        $("#datatabletest_processing").css("display","none");
                            
                        }
}            
        });
        $("#datatabletest_filter").css("display","none"); 
        $('.search-input-text').on( 'keyup', function () { 
          var i =$(this).attr('data-column');
          var v =$(this).val();
          dataTable.columns(i).search(v).draw();
        } );
      });