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How to Implement jQuery slideToggle() in Vanilla JavaScript

on in JavaScript DOM
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If you use jQuery for a handful of effects/animations, here’s a quick JavaScript replacement for jQuery slideToggle(). With small changes, it can be adapted to replace fadeToggle() or simply toggle().

HTML

<a href="#" id="toggle">Slide Toggle</a>

<div id="toggleMe">
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
    <p>Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
</div>

JavaScript

let container = document.getElementById('toggleMe');

document.getElementById('toggle').addEventListener('click', function (event) {
    event.preventDefault();

    if (!container.classList.contains('active')) {
        container.classList.add('active');
        container.style.height = 'auto';

        let height = container.clientHeight + "px";

        container.style.height = '0px';

        setTimeout(function () {
            container.style.height = height;
        }, 0);
    } else {
        container.style.height = '0px';

        container.addEventListener('transitionend', function () {
            container.classList.remove('active');
        }, {
            once: true
        });
    }
});

CSS

#toggleMe {
    transition: height .25s ease;
    overflow: hidden;
}
#toggleMe:not(.active) {
    display: none;
}

See a JSFiddle demo.

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