Tracking internal links using custom events

internal-links.js

function addLinks() {
    const links = document.getElementsByTagName("a");

    for (const link of links) {
        if (!link.hasAttribute("pirsch-ignore") && !link.classList.contains("pirsch-ignore")) {
            addInternalLink(link);
        }
    }
}

function addInternalLink(link) {
    const url = getURL(link.href);

    if (url !== null && url.hostname === location.hostname) {
        link.addEventListener("click", () => pirsch(outboundLinkEventName, {meta: {url: url.href}}));
        link.addEventListener("auxclick", () => pirsch(outboundLinkEventName, {meta: {url: url.href}}));
    }
}

function getURL(href) {
    try {
        return new URL(href);
    } catch {
        return null;
    }
}

addLinks();