How to watermark image in pdf exported in datatable

pratima7

I am using datatables to display data in table format and have given export option , to export data into csv , pdf . Now i want to add a watermark image into pdf that gets downloaded from button in data table.
Here is code i tried but it didnt work for me,
var table = $('#holiday').DataTable( {
"dom": '<"nav" B>lfrtip',
"buttons": [
'excelHtml5',
'csvHtml5',
{
extend: 'pdfHtml5',
customize: function ( doc ) {
doc.content.splice( 1, 0, {
margin: [ 20, 20, 20, 20 ],
alignment: 'center',
image:'data:image/png;base64,abcdddd'
}] });
I also tried using watermark in place of image , but i didnt get result. Please help me regarding this. Thanks in advance

allan

Please follow the forum rules and do not post duplicates. Closing this discussion in favour of this thread.

Allan