Each page of application have to check if the system is idle for 10 minutes, and if then have to refresh the oAuth access token with new refresh token. I have done like below. But I don't know how to get the username and refresh token stored in GlobalVariableclass in ajax.  In code behind of aspx I used to get it as below.

 GlobalVariables obj_GlobalVariables = (GlobalVariables)HttpContext.Current.Session["objGlobalVariableClass"];
 string refesh_token=obj_GlobalVariables.login_refresh_token;

Below is my Global variable class. When login success, stores the login details in GlobalVariables class as below

public class GlobalVariables
{
    public  int login_user_role = 0;
    public  string login_user_name = string.Empty;
    public  string login_user_id = string.Empty;
    public  string login_token = string.Empty;
    public string login_refresh_token = string.Empty;
    public int login_token_expires_in = 0;//1799 sec; 29.9833 minute//1799000
}
GlobalVariables obj_GlobalVariables = new GlobalVariables();
obj_GlobalVariables.login_token = result.access_token;
obj_GlobalVariables.login_token_expires_in = Convert.ToInt32(result.expires_in*1000);//seconds to millisec
obj_GlobalVariables.login_refresh_token=result.refresh_token;
obj_GlobalVariables.login_user_name =result.login_user_name;

Below is my javascript. I want to get login_refrsh_token and login_user_name from GlobalVaribaleclass here.

<script type="text/javascript">
        var interval;
        var IdealTimeOut = 0;
        var idleSecondsTimer = null;
        var idleSecondsCounter = 0;
        var current_time_in_seconds = 0;
        document.onclick = function () { idleSecondsCounter = 0; };
        document.onmousemove = function () { idleSecondsCounter = 0; };
        document.onkeypress = function () { idleSecondsCounter = 0; };

        /*have to get below two values from global class.*/
        var username = null;
        var refresh_token = null;

        function SessionExpireAlert() {
        
            IdealTimeOut = 10;
            idleSecondsTimer = window.setInterval(CheckIdleTime, 1000);
        };
        function CheckIdleTime() {
            idleSecondsCounter++;

             current_time_in_seconds = new Date().getTime() / 1000;
             if (idleSecondsCounter >= IdealTimeOut) {
              window.clearInterval(idleSecondsTimer);
                callAJAXrefreshToken();
            }
        }
            
        function callAJAXrefreshToken() {
            $.ajax({
                type: "POST",
                url: "webservice.aspx/GetLoginTokenWithRefreshToken",
                data: "{ username: '" + username + "', refresh_token: " + refresh_token + "}",
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (r) {
 
                },
                error: function (r) {
                    alert(r.responseText);
                },
                failure: function (r) {
                    alert(r.responseText);
                }
            });
            return false;
        }
</script>