Need help totaling a table column

[MaDmiX]

Hi All,

I have the following function that calls a function to calculate time and then writes the result to a table cell. I need to sum the results at the bottom row of the table. For some reason I am getting NaN. I tried using parseFloat() to make sure my variable was being interpreted as a number but no luck. Any help is appreciated.

function outageLength() {
  var rows=document.getElementById("vari").getElementsByTagName("tr");

  for (var x = 1; x < rows.length-1; x++) { //start at 1 to skip the header cells
    var start=rows[x].cells[0].innerHTML;
    var end=rows[x].cells[1].innerHTML;
    var rowTotal=calculateTime(start,end);
    rows[x].cells[4].innerHTML=rowTotal;

    var rowSecs=TimeToSecs(rowTotal);
    rowSecs=parseFloat(rowSecs);
    var totalSecs;
    totalSecs += rowSecs;
  }
  var grandTotalElem = window.document.getElementById("grandTotal");
  grandTotalElem.innerHTML=totalSecs;
}

Thanks in advance,

Ken

[MaDmiX]

function outageLength() {
  var rows=document.getElementById("vari").getElementsByTagName("tr");
  var result=0;

  for (var x = 1; x < rows.length-1; x++) { //start at 1 to skip the header cells
    var start=rows[x].cells[0].innerHTML;
    var end=rows[x].cells[1].innerHTML;
    var rowTotal=calculateTime(start,end);
    rows[x].cells[4].innerHTML=rowTotal;

    var rowSecs=TimeToSecs(rowTotal);
    totalSecs=parseFloat(rowSecs);

  if (!isNaN(totalSecs))
    result += rowSecs;
  }
  var grandTotalElem = window.document.getElementById("grandTotal");
  grandTotalElem.innerHTML=SecsToTime(result);
}