JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css">
<script src="//code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
<ol id="selectable">
  <li class="ui-widget-content" data-my-attr="attr1">Item 1</li>
  <li class="ui-widget-content" data-my-attr="attr2">Item 2</li>
  <li class="ui-widget-content" data-my-attr="attr3">Item 3</li>
  <li class="ui-widget-content" data-my-attr="attr4">Item 4</li>
  <li class="ui-widget-content" data-my-attr="attr5">Item 5</li>
  <li class="ui-widget-content" data-my-attr="attr6">Item 6</li>
  <li class="ui-widget-content" data-my-attr="attr7">Item 7</li>
</ol>

CSS

#selectable .ui-selecting { background: #FECA40; }
  #selectable .ui-selected { background: #F39814; color: white; }
  #selectable { list-style-type: none; margin: 0; padding: 0; width: 60%; }
  #selectable li { margin: 3px; padding: 0.4em; font-size: 1.4em; height: 18px; }

JavaScript

$(function() {
  $("#selectable").selectable({
    selecting: function(event, ui) {
      console.log($(ui.selecting).data('my-attr'));
    }
  });
});