static/js/pageview_timer.js


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/*
  Hi,

  If you are reading this, you have found this script in the referenced scripts
  for pages on this site. I know you're gonna have to take me at my word on this,
  but I'm literally using this to collect how much time people spend reading my
  webpages. See metrics here: https://christine.website/metrics

  If you have the "do not track" setting enabled in your browser, this code will
  be ineffectual.
*/

(function() {
    let dnt = navigator.doNotTrack;
    if (dnt === "1") {
        return;
    }

    let startTime = new Date();

    function logTime() {
        let stopTime = new Date();
        window.navigator.sendBeacon("/api/pageview-timer", JSON.stringify({
            "path": window.location.pathname,
            "start_time": startTime.toISOString(),
            "end_time": stopTime.toISOString()
        }));
    }

    window.addEventListener("pagehide", logTime, false);
})();