Cells containing custom functions return “NaN'” when spreadsheet is not open. (Apps Script webapp accessing google spreadsheet)

Question

As a high school teacher, I record all of my grading in a Google spreadsheet. I have written custom functions within that spreadsheet that are accessed in the spreadsheet. T

Answer 1

With Eric's advice, I implemented the following function (which runs early on in my app):

function refreshSheet(spreadsheet, sheet) {
  var dataArrayRange = sheet.getRange(1,1,sheet.getLastRow(),sheet.getLastColumn());
  var dataArray = dataArrayRange.getValues(); // necessary to refresh custom functions
  var nanFound = true;
  while(nanFound) {
    for(var i = 0; i < dataArray.length; i++) {
      if(dataArray[i].indexOf('#N/A') >= 0) {
        nanFound = true;
        dataArray = dataArrayRange.getValues();
        break;
      } // end if
      else if(i == dataArray.length - 1) nanFound = false;
    } // end for
  } // end while
}

It basically keeps refreshing the sheet (using .getValues()) until all of the #N/A's disappear. It works fabulously but does add a small lag.

Answer 2

Just to add my own comment:

I've found a similar effect where using Google App Scripts to get values from cells populated by sheet functions such as INDEX() and QUERY().

Eric's comment of using getValues() instead of getValue() may do the trick. But I haven't checked.

A link to my question is here: https://stackoverflow.com/questions/32519900/check-if-google-sheet-query-returned-rows?noredirect=1#comment53128587_32519900.