Find chars/strings with a certain condition applied

Hello fellows,

I am writing an extendscript that is supposed to loop through all pgfs and find all characters/strings with a certain condition applied (let's say, Comment).

The problem is that in the scripting guide, I could not find a function that retrieves the condition property of a character. I tried using the JS "charAt(i)" function, but it does not seem to work in ES. Any idea how to implement such a function?

Below is the 1st draft of the script.

var doc = app.ActiveDoc;

if doc.ObjectValid() {

    checkCondFMt(doc);

}

else{

  Alert("No section open");

}

function checkCondFMt(doc) {

    var pgf = doc.MainFlowInDoc.FirstTextFrameInFlow.FirstPgf;

    var CondObj=doc.GetNamedObject("Comment");

     while (pgf.ObjectValid()){

               var textItems =pgf.GetText(Constants.FTI_String | Constants.FTI_LineEnd);

                var tr = new TextRange();            

                tr.beg.obj = tr.end.obj = textItems;

                tr.beg.offset = 0;

                 for (var i = 0; i < tr.len; i++ ) {

                  var c = tr.charAt(i);             

                  var PgfProps =doc.GetTextVal(c[i], Constants.FO_CondFmt);

                  alert (PgfProps.Name);

           }

        pgf=pgf.NextPgfInFlow;

    }

}

Thank you for your input in advance!