Unhandled exception in GlideAjax in Service Portal

[Farah5]

I am trying to pass an array from a script include to an onChange catalog client script, but no matter what I do, I keep getting the "Unhandled exception in GlideAjax" in my console. 

Here is my script include: 

fetchRoomNumber: function() {
		var building = this.getParameter('sysparm_building');
		var roomInfo = [];
		
		var rooms = new GlideRecord('x_nuvo_eam_elocation');
		rooms.addQuery('floor.building', building);
		rooms.query();
		
		while(rooms.next()) {
			roomInfo.push(rooms.getValue('building'));
			return roomInfo.toString();
		}
		return '';
	},

and my Client Script:

function onChange(control, oldValue, newValue, isLoading) {
   if (isLoading || newValue == '') {
      return;
   }
	
	var ga = new GlideAjax('NEIUtil');
      ga.addParam('sysparm_name', 'fetchRoomNumber');
      ga.addParam('sysparm_building', g_form.getValue("u_building"));
      ga.getXML(setRoomNumbers);
	
	function setRoomNumbers(response) {
		var answer = response;
		if(answer) {
			var arr = answer.split(',');
			alert(arr);
		}
	}
}

I've also tried using 

var arr = answer.evalJSON();

in my client script, but it throws the same error. 

If I try to log "answer", then I get [object object], but any attempt to manipulate the array after that throws the error. 

[Suseela Peddise]

Hi,

Try below

fetchRoomNumber: function() {
var building = this.getParameter('sysparm_building');
var roomInfo = [];

var rooms = new GlideRecord('x_nuvo_eam_elocation');
rooms.addQuery('floor.building', building);
rooms.query();

while(rooms.next()) {
roomInfo.push(rooms.getValue('building'));

}
return roomInfo.toString();

},

Client script:
function onChange(control, oldValue, newValue, isLoading) {
if (isLoading || newValue == '') {
return;
}

var ga = new GlideAjax('NEIUtil');
ga.addParam('sysparm_name', 'fetchRoomNumber');
ga.addParam('sysparm_building', g_form.getValue("u_building"));
ga.getXML(setRoomNumbers);

function setRoomNumbers(response) {
//var answer = response;
var answer = response.responseXML.documentElement.getAttribute("answer");
if(answer) {
var arr = answer.split(',');
alert(arr);
}
}
}

If I have answered your question, please mark my response as correct and/or helpful.

Thanks,

Suseela P.