JSFiddle - React, Tailwind, and code Playground
HTML
<ul id = "qualquer">
<li id = "listitem1" class = "middle_item">
</li>
<li id = "listitem2">
</li>
<li id = "listitem3">
</li>
</ul>
JavaScript
var i = $("#qualquer .middle_item").attr("id");
alert(i);