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Difficult exercise :( I was convinced that we should use data: null or columnDefs: but I'm going to look at the problem today :)

columns you can set columnDefs.targets to an array, like this: "columnDefs": [ { "targets": [ 0, 1, 5,

render if I do "columnDefs":[ { "targets": 1, "data": {nome

dom: 'Bfrtip', buttons: [ 'excel','print' ], columnDefs: [{ "orderable": false, "targets": 3

data: "forex.rate" }, { data: "forex.update_time" } ], columnDefs: [ // targets may be classes

You don't need to set the class in the HTML, just use columns or columnDefs https://datatables.net/reference/option/columns.className You can also use column names for the same purpose https://datatables.net/reference/option/columns.name I can't see how else you would target a cell.

sort: true, "columns": columns_all, "columnDefs": [ {"className": "dt-center", "targets": "_all"}

Either in the columnDefs, or columns. C

btn-icon-toggle btn-primary"><i class="md md-delete"></i></button>' } ], columnDefs: [{ targets: -2, render: function

You can use columnDefs and set the columnDefs.targets as your column indexes.