Assistance would be appreciated if I can address the below.

I'm trying to get the value from a datatable column ([8]) and pass it to the input form value within "defaultContent".

<script type="text/javascript" class="init">    
    
$(document).ready(function() {

    //var table = $('#carddetails').DataTable();
    
    $('#carddetails').DataTable( {
        "processing": true,
        "serverSide": true,
        "ajax": "../test/processing.php",
        "columnDefs": [ 
        { "bVisible": false, 
          "aTargets": [8] 
        },
            {
            "targets": -1,
            "data": null,
            "defaultContent": '<div class="btn-group"> <form action="../cardman/cardDetails?is=yes" method="post"><input name="cPan" type="text" id="cPan" value=""/><button type="submit" id="search" class="btn btn-info btn-xs dt-view" style="margin-right:16px;"><span class="glyphicon glyphicon-eye-open glyphicon-info-sign" aria-hidden="true"></span></button></form>  <form><button type="button" class="btn btn-primary btn-xs dt-edit" style="margin-right:16px;"><span class="glyphicon glyphicon-print" aria-hidden="true"></span></button></form></div>'
        }
        ],
        //"aoColumnDefs": [{ "bVisible": false, "aTargets": [8] }]
        "dom": 'Bfrtip',
        "buttons": [
                          /* {
                               "extend": 'copy',
                               "text": '<i class="fa fa-files-o" style="color: green;"></i>',
                               "titleAttr": 'Copy',                               
                               "action": newexportaction
                           },*/
                           {
                               "extend": 'excel',
                               "text": '<i class="fa fa-file-excel-o" style="color: green;"></i>',
                               "titleAttr": 'Excel',                               
                               "action": newexportaction
                           },
                           {
                               "extend": 'csv',
                               "text": '<i class="fa fa-file-text-o" style="color: green;"></i>',
                               "titleAttr": 'CSV',                               
                               "action": newexportaction
                           },
                           {
                               "extend": 'pdf',
                               "text": '<i class="fa fa-file-pdf-o" style="color: green;"></i>',
                               "titleAttr": 'PDF',                               
                               "action": newexportaction
                           }/*,
                           {
                                "extend": 'print',
                                "text": '<i class="fa fa-print" style="color: green;"></i>',
                                "titleAttr": 'Print',                                
                                "action": newexportaction
                           }*/
                        ]
    } );
} );
</script>

Edited by Kevin:  Syntax highlighting. Details on how to highlight code using markdown can be found in this guide