Buttons do not work when using DataTable with ajax

[danielsbarros]

When initializing a DataTable using ajax and buttons at the same time, the buttons never show up on screen.

var table = $('#example').DataTable( {
    ajax: "data.json",
    buttons: ['copy', 'excel', 'pdf', 'print', 'csv']
} );

[AllanJard]

See this example. You need the dom parameter.