POS-Server/app/views/product_wastes/create.js.erb

var table = $('#products_table').DataTable();
var newRow = $('<%= j render (@product_waste) %>');
x = $('#products_table').dataTable();
newRow.find('td:eq(0)').html(newRow.find('td:eq(0)').html().replace('#', x.fnGetData().length + 1));
table.row.add(newRow).draw();