DataTables Processing Info does not show up

Question

I included my server-side processing DataTables in jQuery UI TABS but after integration the processing info does not show up anymore :(

This stackoverflow.com post writes something about a hidden "Processing..."-Div.
Is it possible that my case matches a "z-index" problem?

This is the DataTables code :

$(document).ready(function() {

    $('#example').DataTable( {
        "processing": true,
        "serverSide": true,
        "ajax": {
            "url": "ajax_ssp_class.php",
            "type": "GET"
        },
        "order": [ [0,'asc'] ],
        "paging":true,
        "pagingType": "simple_numbers",
        "pageLength": 50,
        "lengthMenu": [[50, 100, 250, -1], [50, 100, 250, "All"]],
        "lengthChange": true
    } );
});

The proof whether the div is existent is tested as true:

<div id="example_processing" class="dataTables_processing" style="display: block; z-index: 10000;">Processing...</div>

THE SOLUTION
I added the following line to the pre-drawing. Now it works.

"fnPreDrawCallback":function(){
    //alert("Pre Draw");
    $('#example_processing').attr('style', 'font-size: 20px; font-weight: bold; padding-bottom: 60px; display: block; z-index: 10000 !important');
}

Answer 1

I had a similar problem with the processing text not showing up when using server-side processing and then using search, re-order or changing the page size. The fix was to add the following CSS...

<style type="text/css">
    .dataTables_processing {
        top: 64px !important;
        z-index: 11000 !important;
    }
</style>

The key things here were the z-Index and top.

This also depends on having

"processing": true,

in your datatables initialisation

Answer 2

1. The ‘processing‘ option needs to be set to true and
2. In the ‘sDom‘ option the letter ‘r‘ was needed.

After making the amends, the final code looked something like so:

var options = {  
    "sDom": 'prtp',  
    "processing": true,  
    "serverSide": true,  
    "ajax": "/path/to/my/ajax.php"  
}  
var oTable = $('.datatables').dataTable(options);