JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
        <div class="sidebar">
            <a id="foryu" href="#">Login</a>
            <div id="div1" style="display: none">
                this will show
            </div><hr />
            <ul>
                <li onclick="location.href='#'"><a href="#">Home</a></li>
                <li onclick="location.href='#'"><a href="#">About</a></li>
                <li onclick="location.href='#'"><a href="#">Gallery</a></li>
                <li onclick="location.href='#'"><a href="#">Contact</a></li>
            </ul>
        </div>
    </div>

JavaScript

$('a#foryu').click( function() { slide('#div1'); return false; } );

function slide(div) {
            console.log("test");
            if ($(div).css('display') === 'none') {
                $(div).slideToggle(500);
                return false;
            } else {
                $(div).slideToggle(500);
                return false;
            }
        }