Bootbox Confirm Not Working

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Javascript

jQuery

Hello, any boude know how to fix this. I have this code to show bootbox.confirm when deleting a file, but it's not working.

$('#fileupload').fileupload({
    destroy: function (e, data) {
       var that = $(this).data('fileupload');  
          if (bootbox.confirm("Delete this file(s) ?") == true ) {
            if (data.url) {
                $.ajax(data)
                    .success(function () {
                          $(this).fadeOut(function () {
                            $(this).remove();
                        });
                    });
            } else {
               data.context.fadeOut(function () {
                 $(this).remove();
               });
            }
        }
    }
});