Calling Script Include from catalog client script

[chidanandadhath]

I have below Catalog client script which calls the script include. I'm getting the answer as null

function onChange(control, oldValue, newValue, isLoading) {
	
	if(newValue == oldValue) {
		return;
	}
	var answer_json = [];
	var gaj = new GlideAjax('x_113476_managed_c.getCiClass');
	gaj.addParam('sysparm_name','getPrimaryCiClass');
	gaj.getXML(ajaxResponse);
	function ajaxResponse(response) {
		var answer = response.responseXML.documentElement.getAttribute("answer");
		alert(answer);
		if(answer) {
			answer_json = answer.evalJSON();
			//alert(answer_json);
		}
		
	}
	
	var collectorName = 'CIs';
	var filterString = 'sys_class_nameIN'+answer_json;
	
	try{
		var myListCollector = g_list.get(collectorName);
		myListCollector.reset();
		myListCollector.setQuery(filterString);
	}
	
	catch(e){
		
		window[collectorName + 'g_filter'].reset();
		window[collectorName + 'g_filter'].setQuery(filterString);
		window[collectorName + 'acRequest'](null);
	}
}
//}

Script include

var getCiClass = Class.create();
getCiClass.prototype = Object.extendsObject(global.AbstractAjaxProcessor, {
	
	initialize: function() {
	},
	
	getPrimaryCiClass : function()
	{
		gs.addInfoMessage('calling script include');
		var strCiClass = '';
		var arrConfigItemClass = [];
		var grPrimaryCiClass = new GlideRecord('x_113476_managed_c_managedciclass');
		grPrimaryCiClass.addActiveQuery();
		grPrimaryCiClass.addQuery('primary_ci_class',true);
		grPrimaryCiClass.query();
		while (grPrimaryCiClass.next())
			{
			strCiClass = grPrimaryCiClass.ci_class;
			arrConfigItemClass.push(strCiClass.toString());
			
			
		}
		return arrConfigItemClass;
	},
	
	type: 'getCiClass'
});

[chidanandadhath]

I have the below script 

function onChange(control, oldValue, newValue, isLoading) {

if(newValue == oldValue) {
return;
}

var gaj = new GlideAjax('x_113476_managed_c.getCiClass');
gaj.addParam('sysparm_name','getPrimaryCiClass');
//gaj.getXML(ajaxResponse);
gaj.getXMLWait();

var strAnswer = gaj.getAnswer().toString();
var getAnswer=strAnswer.split(',');
alert(getAnswer);
var filterString = [];
filterString = 'sys_class_name=' + getAnswer[0];

if(getAnswer.length > 1){

for (var i=1; i<getAnswer.length;i++){

filterString += '^ORsys_class_name=' + getAnswer[i];

}

var collectorName = 'CIs';

try{
var myListCollector = g_list.get(collectorName);
myListCollector.reset();
myListCollector.setQuery(filterString);
}

catch(e){

window[collectorName + 'g_filter'].reset();
window[collectorName + 'g_filter'].setQuery(filterString);
window[collectorName + 'acRequest'](null);
}
}
}



//}

But on change I'm not getting the value