Called Client Script Returning Undefined

[Marc D]

Hello, everyone.  I'm having an issue with an implementation of a solution for my client.

I have been tasked for a form to compare the company of a user on the form with another company listed on the form itself, and to make certain fields read-only if they are identical. This is in and of itself fairly simple - a GlideAjax call.

However, I have to use this same functionality multiple times over multiple Client Scripts, and to cut down on the same GlideAjax call being written repeatedly, I placed it within a function within a separate Client Script and had my main Client Scripts call this function.

This is how it looks:

Script Include:

getUserCompany: function() {
	var userID = this.getParameter('sysparm_userid');

        if (userID != "") {
            var userGr = new GlideRecord("sys_user");
            if (userGr.get(userID)) {
			   var res = userGr.company;
			   return res;
		    }
         }
     return "";
}

Callable Client Script:

userCompanyCheck = function() {
    var user = g_form.getValue('form_user');
    var company = g_form.getValue('form_company');

    var userCompany = new GlideAjax('<Script Include Name>');
    userCompany.addParam('sysparm_name', 'getUserCompany');
    userCompany.addParam('sysparm_userid', user);
    userCompany.getXML(compareCompany);

    function compareCompany(response) {
        var answer = response.responseXML.documentElement.getAttribute("answer");
        if (answer != company) {
            return 'false';
        } else {
            return 'true';
        }
    }
};

Main Client Script:

var userHasSameCompany = userCompanyCheck();
if (userHasSameCompany == 'true') {
        g_form.setValue('internal_comparison_flag', 'No');
} else {
        g_form.setValue('internal_comparison_flag', 'Yes');
}

But there's an issue with this: in the main Client Script, userHasSameCompany ALWAYS returns "undefined" from userCompanyCheck(), regardless of whether or not it returned "true" or "false", and I have checked - it has reached both.

What is the problem with my implementation? Did I do something wrong?