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jQuery UI Sortable で位置を取る

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jQuery UI Sortable で、ドラックしたアイテムが何番目になったのか取得する。
update のタイミングで親まで遡って自分が何番目か index() で取得する。

$('#mylist').sortable({
  update: function( e, ui ) {
    let index = ui.item.closest('ul').find('li').index(ui.item[0]);
  }
});
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