willy.club/public/static/js/jarring.js

/**
 * Reloading the page can feel jarring!
 * Replace the content of the page without reloading the DOM
 */
onclick = (e) => {
    let element = e.target;
    if (element.tagName == 'A') {
        navigate(element.href).then(function(url) {
            window.history.pushState('', '', url);
        });
        return false; // prevent default action and stop event propagation
    }
};

onpopstate = () => {
    navigate(document.location);
};

function navigate(href) {
    document.body.className = 'leaving';
    return new Promise((resolve) => {
        fetch(href)
            .then(async (response) => {
                html = await response.text();
                //var parser = new DOMParser();
                //var doc = parser.parseFromString(html, 'text/html');
                //document.getElementById('pageContent').innerHTML = doc.getElementById('pageContent').innerHTML;
                setTimeout(() => {
                    document.body.parentNode.innerHTML = html;
                    document.body.className = 'entering';
                }, 250);
                resolve(response.url);
            }).catch(function (err) {
                // There was an error
                console.warn('Something went wrong.', err);
            });
        }
    );
}