JSFiddle - React, Tailwind, and code Playground

HTML

<ul id='listofpages'>
    <li id='item1'>First</li>
    <li id='item2'>Second</li>
    <li id='item3'>Third</li>
</ul>

JavaScript

$( "#listofpages" ).sortable({
  update: function( event, ui ) {
    alert(ui.item.attr("id"));
  }
});