JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li data-nodeid="1">
        <div><a href="#child1">child1</a></div>
        
    </li>
    <li data-nodeid="2">
        <div><a href="#child2">child2</a></div>
    </li>
</ul>
<div id="result"></div>

JavaScript

var nodeValue = $('a[href="#child1"]').parents("li").attr("data-nodeid");

document.getElementById('result').innerHTML = nodeValue;