How can I get a list of selections in a select box? (Script on Page 387 of Acrobat JavaScript Scripting Refence not Working)

I am trying to use the well known code on page 387 of Acrobat JavaScript Scripting Reference:

var f = this.getField("myList");

var a = f.currentValueIndices;

if (typeof a == "number") // a single selection

console.println("Selection: " + f.getItemAt(a, false));

else {// multiple selections

console.println("Selection:");

for (var i = 0; i < a.length; i ++)

console.println(" " + f.getItemAt(a, false));

}

However, in my code, it is not working (please see: <ACRO_source>Room:Keystroke</ACRO_source> at the bottom of the listing).  Most of the time it just produces the text:

Selection: FIRST_ELEMENT

Sometimes it produces a short list, but never the correct list of the selected elements in the select box.

//<Document-Level>

//<ACRO_source>Main</ACRO_source>

//<ACRO_script>

/*********** belongs to: Document-Level:Main ***********/

var buildingRoom = {};

var oFile = this.getDataObjectContents("export.csv");

var cFile = util.stringFromStream(oFile, "utf-8");

var arr = cFile.replace(/\r\n/g, ",").split(",");

var building;

var room;

for(var i = 0; i < arr.length-1; i++)

{

   building = arr.replace(/\r?\n|\r|"/g,'');

   if(!(building in buildingRoom))

        buildingRoom[building]=[];

   room = arr[++i].replace(/\r?\n|\r|"/g,'');

   buildingRoom[building].push([room,room]);

}

var buildingArr = Object.keys(buildingRoom);

var buildingArrItems = [];

for(var i = 0; i < buildingArr.length; i++)

    buildingArrItems.push([buildingArr,buildingArr]);

this.getField("Room").setItems(buildingRoom[Object.keys(buildingRoom)[0]]);

this.getField("Building").setItems(buildingArrItems);

var f = this.getField("Room");

//</ACRO_script>

//</Document-Level>

//<AcroForm>

//<ACRO_source>Building:Keystroke</ACRO_source>

//<ACRO_script>

/*********** belongs to: AcroForm:Building:Keystroke ***********/

if(event.willCommit)

{

//console.println("buildingEvent");

//console.println(event.value);

//console.println(buildingRoom[event.value]);

this.getField("Room").clearItems();

this.getField("Room").setItems(buildingRoom[event.value]);

}

//</ACRO_script>

//</AcroForm>

//<AcroForm>

//<ACRO_source>Room:Keystroke</ACRO_source>

//<ACRO_script>

/*********** belongs to: AcroForm:Room:Keystroke ***********/

var a = f.currentValueIndices;

if (typeof a == "number") // a single selection

console.println("Selection: " + f.getItemAt(a, false));

else {// multiple selections

console.println("Selection:");

for (var i = 0; i < a.length; i ++)

console.println(" " + f.getItemAt(a, false));

}

//</ACRO_script>

//</AcroForm>