JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="sortable">
  <li id="order_0" class="ui-state-default">1</li>
  <li id="order_1" class="ui-state-default">2</li>
  <li id="order_3" class="ui-state-default">3</li>
  <li id="order_4" class="ui-state-default">4</li>
  <li id="order_5" class="ui-state-default">5</li>
  <li id="order_6" class="ui-state-default">6</li>
  <li id="order_7" class="ui-state-default">7</li>
  <li id="order_8" class="ui-state-default">8</li>
</ul>

<p></p>

CSS

#sortable { list-style-type: none; margin: 0; padding: 0; width: 450px; }
  #sortable li { margin: 3px 3px 3px 0; padding: 1px; float: left; width: 100px; height: 90px; font-size: 4em; text-align: center; }

JavaScript

$(function() {
    $( "#sortable" ).sortable();
    $( "#sortable" ).disableSelection();

    $( "#sortable li" ).droppable({
        drop: function( ) {
            var order = $("#sortable").sortable("serialize", {key:'order[]'});
            $( "p" ).html( order );
        }
    });
});