get user_name from List Collector (sys_user) and put user+user_name into hidden variable

[Community Alums]

I have a catalog item with a list collector that gathers multiple users. When that variable comes through on the ritm/task, it's just a list of names. What is desired is for their user_name to also appear. However, I don't want a separate field on the form that they see when they're filling this out; I only want it to be passed to the ritm/task after the form is submitted. I thought I'd make a multiline textbox variable that could fill in the users and their usernames in this format: 

    Bob User [bob123]

    Sally User [sally456]

by using a client script and script include. Neither is working and when I submit the form, I get 'Unhandled exception in GlideAjax'. Can you please look at what I have and help? 

Here is the client script (ui type=all; applies to cat item, ritm, task): 

function onSubmit() {
   //array of sys_ids from list collector variable 
    var usersToAdd = g_form.getValue('persons_requiring_access').toString().split(',');

    var ga = new GlideAjax('GetListCollectorVariables'); //call the script include
    ga.addParam('sysparm_name', 'UsersListCollector'); //name of function in script include
    ga.addParam('sysparm_users', usersToAdd); //pass array of users to SI
    ga.getXML(GetVariables);

    function GetVariables(response) {
        var answer = response.responseXML.documentElement.getAttribute('answer');
        g_form.setValue('persons_requiring_access_text', answer);
    }
   
}

Here is the script include (client callable = true; global scope) 

var GetListCollectorValues = Class.create();
GetListCollectorValues.prototype = Object.extendsObject(global.AbstractAjaxProcessor, {
    UsersListCollector: function() {
		var userInfo = '';
		var usersFromListCollector = this.getParameter('sysparm_users');
		var grUser = new GlideRecord('sys_user');
		grUser.addQuery('sys_id','IN',usersFromListCollector);
		grUser.query();
		while(grUser.next()) { 
			userInfo += grUser.name + ' [' + grUser.user_name + ']';
		}
		return info.toString();
    },
    type: 'GetListCollectorValues'
});

[Community Alums]

that's it!!!! thank you so much 🙂 

I only spent all day scripting hahah. A good lesson to learn though. 

[Harsh Vardhan]

hahah, np. glad it helped. 

Smash the helpful button , so I can get some extra points 😛

[vickysharland]

I am attempting this on a record producer catalog item. I can see the result is exactly what I want, but, when the form is submitted it only brings over the display name and not the scripted user name. Any ideas on how to get the formation to pass to the ticket?