function fillStats() {
  var tbl = document.getElementById('statstable');
  if (tbl.rows.length > 1) {
    for (let i = 0; i < 6; i++) {
      console.log("Table Update row: " + i + " state " + pState[i] + " is " + linkS[pState[i] +1]);
      tbl.rows[i+1].cells[1].innerHTML = `${linkS[pState[i]+1]}`;
      tbl.rows[i+1].cells[2].innerHTML = `${txG[i]} pkts`;
      tbl.rows[i+1].cells[3].innerHTML = `${txB[i]} pkts`;
      tbl.rows[i+1].cells[4].innerHTML = `${rxG[i]} pkts`;
      tbl.rows[i+1].cells[5].innerHTML = `${rxB[i]} pkts`;
    }
  } else {
    for (let i = 0; i < 6; i++) {
      console.log("Table row: " + i);
      const tr = tbl.insertRow();
      let td = tr.insertCell(); td.appendChild(document.createTextNode(`Port ${i+1}`));
      td = tr.insertCell(); td.appendChild(document.createTextNode(`${linkS[pState[i]+1]}`));
      td = tr.insertCell(); td.appendChild(document.createTextNode(`${txG[i]} pkts`));
      td = tr.insertCell();td.appendChild(document.createTextNode(`${txB[i]} pkts`));
      td = tr.insertCell();td.appendChild(document.createTextNode(`${rxG[i]} pkts`));
      td = tr.insertCell();td.appendChild(document.createTextNode(`${rxB[i]} pkts`));
    }
  }
}

function getCounts() {
  for (let port = 1; port <= numPorts; port++) {
    var xhttp = new XMLHttpRequest();
    xhttp.onreadystatechange = function() {
      if (this.readyState == 4 && this.status == 200) {
        const s = JSON.parse(xhttp.responseText);
        console.log("Counters: ", JSON.stringify(s));
      }
    }
    xhttp.open("GET", `/counters.json?port=${port}`, true);
    xhttp.send();
  }
}

window.addEventListener("load", function() {
  const iCount = setInterval(getCounts, 1000);
});
const stat = setInterval(fillStats, 500);