JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="menu" class="sidebar">
    <li> <a href="#" class="clickme">Menu</a>
        <ul id="menu1">
            <li><a class="dropdown-class-name" href="#">Dropdown link1</a></li>
            <li><a class="dropdown-class-name" href="http://jsfiddle.net/hnxhcbgw/">Dropdown link2</a></li>
        </ul>
    </li>
</ul>

CSS

#menu1 li a.active{
    font-weight:bold;
}

JavaScript

var localURL = '[href="'+window.location.href+'"]'

$('#menu1 li a'+localURL).click(function(e) {
    $('a').removeClass('dropdown-class-name active');
    $(this).addClass('dropdown-class-name active');
});