Add parameter to datatable ajax call before draw

Question

I am using DataTables 1.10

Does anyone know how to dynamically add a parameter to the ajax call before table.draw() so my request has new parameters? I've looked everywhere and cannot find an answer.

I have buttons that a person can press and based on that button send different parameters to the server.

$('#mytable').DataTable({
        iDisplayLength: 10,
        responsive: true,
        processing: true,
        serverSide: true,
        searching: false,
        bLengthChange: false,
        bProcessing: true,
        paging: true,
         ajax: {
            url: me.url,
            dataType: 'json',
            cache:false,
            type: 'GET',
            data: function ( d ) {
                $.extend( d, me.data);
                d.supersearch = $('.my-filter').val();
            }
        },
        columns: me.columns,
        columnDefs: me.renderer,
        initComplete: function() {

        }
    });

This all works fine but then I try to tie it to a button to pass new parameters.

$('.button').on('click', function(){
      var table  = $('#mytable').DataTable();
      table.ajax.params({name: 'test'}); <- I want to do something like this
      table.draw(); 
})

Answer 1

I have modified your code to do what you need.

Initialize a data table:

 $('#mytable').DataTable({
    iDisplayLength: 10,
    responsive: true,
    processing: true,
    serverSide: true,
    searching: false,
    bLengthChange: false,
    bProcessing: true,
    paging: true,
    ajax: {
       url: me.url,
       dataType: 'json',
       cache:false,
       type: 'GET',
       data: function ( d ) {
          $.extend(d, me.data);
          d.supersearch = $('.my-filter').val();

          // Retrieve dynamic parameters
          var dt_params = $('#mytable').data('dt_params');
          // Add dynamic parameters to the data object sent to the server
          if(dt_params){ $.extend(d, dt_params); }
       }
    },
    columns: me.columns,
    columnDefs: me.renderer,
    initComplete: function() {

    }
 });

Handle click event on a button:

NOTE: I'm assuming that this is the only place where you would be adding dynamic parameters for AJAX call.

 $('.button').on('click', function(){
    // Set dynamic parameters for the data table
    $('#mytable').data('dt_params', { name: 'test' });
    // Redraw data table, causes data to be reloaded
    $('#mytable').DataTable().draw();
 });

Answer 2

My way is not so pretty, but very simple and works great: when I want to pass custom parameters while redrawing the DataTable, first I simply change its URL:

$('#table_id').DataTable().ajax.url('/custom/path/with/custom/parameters/inside/');
$('#table_id').DataTable().draw();

Then, if necessary, as a first step of the "on draw.dt" event I change it back to the normal URL:

$('#table_id').on('draw.dt', function() {
    $('#table_id').DataTable().ajax.url('/normal/path/for/ajax/source/');
    // ...
)};

The only disadvantage of this approach that it needs some trick to squeeze those custom parameters into the alternative path. Besides, it needs some server-side work also to prepare that alternative route and to extract those custom parameters from it.