OK...HOLD ON!!!!  Time for me to eat a bit of crow on this one for a moment. My previous example only worked because of some other code I had in the background of my app that was forcing a ?logout if it detected a condition where an idle session timeout occoured, deleting the DomAuthSessID cookie. SO, my previous example would not work under normal circumstances. I have updated the code below to do an ajax call to see if the session has timed out, and if so, then do the redirect.

My Apologies....

 

Here's a little gem that can be used to watch for a session that has timed out due to inactivity (Idle Session).  This gets handy if you are using a lot of partial refreshes in XPages. If the user returns to the application after the Idle Timeout has occured, and performs an action that results in a partial refresh, you can get very bad results because the partial refresh will re-direct to the server login page, embedding itself partially in the refreshed section. The login may not work, and overall, it can do very bad things to your application's perceived "integrity".

Hence, this code snipet.  It uses a javascript setInterval to check the contents of the page's cookie for the DomAuthSessID, if it finds it with the server via an ajax call to see if the session has expired. If it hasn't, it happily moves on and wil get called again in 16 mins, if not, it redirects to a login page, with a RedirectTo= set back to this page.

The code below checks every 16 mins (16 mins * 60 secs per minute * 1000 milliseconds = 960000). You'll probably want to play with the timeout interval to get a good balance of not checking too frequently, and not letting the session idle out before redirecting.

Also, if you use multi-server single sign on, you'll want to change it from checking for DomAuthSessID to lptatoken....

function checkLogin() {
   dojo.xhrGet({
     url : window.location.href.split('.nsf')[0] + ".nsf?opendatabase",
     handleAs : 'text',
     preventCache : true,
     load : function(response, ioArgs) {
       if (response.indexOf('action="/names.nsf?Login"')!=-1){
         clearInterval();
         window.location.href = window.location.href.split('.nsf')[0] + ".nsf?Login&RedirectTo=" + window.location.href
       }
     },
     error : function(response, ioArgs) {
        // Do any custom error handling here that you want to.
     }
  })
};

dojo.addOnLoad(function(){
    setInterval("checkLogin()", 960000);
});