issue.xpub.nl/12/liveplayer.js

function liveplayer (elt) {
  var last_timestamp,
      DELAY_TIME_SECS = 5;

  async function poll () {
      var rows = await (await fetch("/cgi-bin/radioimplicancies.cgi")).json();
      // console.log("rows", rows);
      if (rows) {
        // get the last (most recent) item
        var d = rows[rows.length-1];
        if (d.time && d.time != last_timestamp) {
          last_timestamp = d.time;
          console.log("liveplayer: current metadata", d);
          window.setTimeout(function () {
            var old_nowplaying = elt.querySelector(".now_playing");
            if (old_nowplaying) {
              old_nowplaying.classList.remove("now_playing");
            }
            var nowplaying = elt.querySelector("#"+d.title);
            if (nowplaying) {
              console.log("liveplayer: nowplaying", nowplaying);
              nowplaying.classList.add("now_playing");
            } else {
              console.log("liveplayer: warning no div matching title " + d.title);
            }
          }, DELAY_TIME_SECS*1000);
        }
      }
  }

  window.setInterval(poll, 5000);
}