Firstly, I need to send attribute data-name with sorting like this:
/sorting?firstname=0&lastname=1&email=2&country=3
Here is my code:
$("#sortable").sortable({
    revert: true,
    axis: 'y',
    stop: function(event, ui) {
        var data = $(this).sortable('toArray', {
            attribute: 'data-name'
        });
        $.ajax({
            data: data,
            type: 'GET',
            url: '/sorting'
        });
    }
});
$("#draggable").draggable({
    connectToSortable: "#sortable",
    helper: "clone",
    revert: "invalid"
});
How to do that?
And secondly, when i dragged item "Drag empty" to the list, I need to send sorting without them. I need to skip them, for. ex.:
/sorting?firstname=0&lastname=1&email=3&country=4
"Drag empty" is after lastname, then email and country have sorting +1.
Here code sample: