GlideAjax - return a value from callBack

[poyntzj]

I have a script in a catalog item that calls a function

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

	checkNameSpace();
   
}

the function is another Client script that runs onload and allows the function to be called - see below

Right now I am passing the variable strField to the callback and doing some processing there - which works, but it would be a lot easier for what I am doing to use some code like the below where I simply return a true/false and do something from the calling script.
(so this is a shared function and editing this for a number of target fields is quite simply bonkers when the calling script above, can get a true/false and do the work.  It keeps the script below simple and quicker)

I am however stumped at how to get that true / false from the callBack

function onLoad() {
}

checkNameSpace = function() {
	var strField = 'tenant_namespace';	
	g_form.hideFieldMsg(strField,true);
	var strName = g_form.getValue(strField)+'-' +g_form.getValue('tenant_environment')+'';
	if(strName.length < 6) {
             return true;
	}

	var ga = new GlideAjax('ValidationsAjax');
	ga.addParam('sysparm_name','checkNameSpace');
	ga.addParam('sysparm_environment',g_form.getValue('tenant_environment')+'');
	ga.addParam('sysparm_namespace',g_form.getValue(strField)+'');
	ga.getXMLAnswer(function(response){processNS(response,strField);});


	function processNS(response,strField) {
		try {
			var answer = response;
			if(answer =='true' || answer == true) {
				// Right now, I am doing some more work here on the strField  - I want to remove
				return true;
			} else {
				return false;
				// Right now, I am doing some more work here on the strField  - I want to remove
			}

		} catch(e) {
			console.log('check ns error : ' + e);
		}
	}

};

Any ideas if it can be done. I have not found anything

[poyntzj]

Just been trying and keep n getting a unhandled exception in GlideAjax - I'll leave for now and have another look when I get more time

[Willem]

Ok thanks for the update. Feel free to share the script include when you want to continue work on this