JSFiddle - React, Tailwind, and code Playground

HTML

<div id="main_category_field" class="fields">
    <div class="cat_list">
        <ul>
            <li class=""><a rel="1866" href="#1866">Sports Cards &gt;</a></li>
            <li class=""><a rel="1867" href="#1867">Gaming Cards &gt;</a></li>
            <li class=""><a rel="1868" href="#1868">Non-Sport Cards &gt;</a></li>
            <li class=""><a rel="1869" href="#1869">Supplies &amp; Storage &gt;</a></li>
            <li class=""><a rel="1940" href="#1940">Video Games </a></li>
        </ul>
    </div>
    <div class="contentClear"></div>
</div>

JavaScript

$(document).on("click", "#main_category_field", function(e){
        var rel = e.target.rel;
        alert(rel);
    });