GWT is javascript. You can leverage all your Javascript code from the GWT framework. That being said, you're pretty much SOL on notifying the server on a page refresh. I believe, although not 100% sure, that you cannot do anything* while the page is closing (which is what happens from the perspective of Javascript).
The ONLY one that can detect the client closing is the server through a heartbeat (in other words, you can only approximate - and if you're wrong you've got to handle it gracefully on the client side by informing them their session timed out). * DOM manipulation & any kind of network communication. http://www.telerik.com/help/aspnet-ajax/ajxmozillacancelrequest.html On Wed, Apr 1, 2009 at 4:58 PM, bigtruckdriver <[email protected]>wrote: > > I do have some server-side cleanup functionality which is basically a > session expiry, but this application is going to be needing every > advantage it can get in terms of server memory, so I need this close > window cleanup to occur as well (even though it's not a guarantee that > it will work every time, as Luke mentioned). > I think the only solution here is to call some javascript outside GWT > that can detect a page refresh. > > On Mar 27, 3:58 pm, Vitali Lovich <[email protected]> wrote: > > The way I solve this is that a timer on the server cleans up sessions > > that haven't had activity in a while. > > > > It's a little bit simpler for me since I have a stateless setup with > > the session id simply being used for authentication purposes. > > > > I think that's the most robust approach - you don't need to maintain > > complicated state information in the server. You simply have a > > permissions based approach as to whether or not a user is allowed to > > modify global resources & the client-side takes care of state. > > > > On Fri, Mar 27, 2009 at 4:23 PM, lukehashj <[email protected]> wrote: > > > > > You can not rely on this event being raised before the browser is > > > closed. You can use the onunload="someJavascript()" on your body tag > > > and then some JSNI to call your google code. > > > > > Here's the problem: the event gets raised, and you start doing your > > > work. The window gets closed before you finish doing your work, and > > > your rpc never completes and the server never knows. > > > > > I'd say at best you get a 50% success rate with the window close > > > events :) > > > > > -luke > > > > > On Mar 26, 3:58 pm,bigtruckdriver<[email protected]> wrote: > > >> I'm in a similar predicament, perhaps you might have an idea of what > > >> to do. > > > > >> When the user closes the browser window, I want the application to > > >> logout his/her session automatically so as to free up memory on the > > >> server from their session. So I use the onWindowClosed() function to > > >> take care of this... But when the page is refreshed, the session gets > > >> logged out as well through the same function. This is something I want > > >> to stop from happening. Any suggestions? > > > > >> On Mar 15, 9:26 am, Rohit <[email protected]> wrote: > > > > >> > Hi > > >> > There is no way in GWT to distinguish betweenRefreshbuttonclick and > > >> > Window closebuttonclick. But you can trackrefreshbuttonwith a > > >> > little trick. You should use a time cookie which will expire after > > >> > some time. So whenrefreshbuttonis pressed, in on module load of > > >> > entry point , track the value of this cokkie, if this cookie is > still > > >> > alive, this meansrefreshbuttonis pressed. The time this cookie will > > >> > expired should be considered. It should be very little. > > > > >> > Second for history, you should save your information in Session on > > >> > window close and then ifrefreshbuttonis pressed, get your > > >> > information from this session. > > > > >> > Thanks and regards > > > > >> > Rohit > > > > >> > On Mar 14, 2:30 am, "levi.bracken" <[email protected]> wrote: > > > > >> > > You can restore state, but it's a bit more work than just using > GWT > > >> > > History. Basically you'll need to come up with some way of > modifying > > >> > > the url search parameter (stuff after the #) to include some info > so > > >> > > that you can bring the userbackinto the same state as they were > > >> > > before. For example, if your application has a number of screens > and > > >> > > they were on screen foo, which was loading with properties for an > item > > >> > > with id 10 then you'd need that information in the Url. > > > > >> > > ex: http://yourApp.com/gwtHostPage.html#screen=foo_id=10 > > > > >> > > You could also put a conversation id in the url param and then > keep > > >> > > the fine details cached on the server, but that makes the > state/data > > >> > > more transient. If you go with an option like this though it can > help > > >> > > make your pages open and work in other tabs and even make points > in > > >> > > your application bookmark'able'. > > > > >> > > Now for the easy answer, yes you can just prevent the user from > > >> > > carelessly clickingrefresh. Fortunately there isn't a way to trap > > >> > > somebody on a webpage (think about how bad the web would be). > But, > > >> > > you can use the WindowCloseListener to present a user with a > > >> > > confirmation before they close the window, navigate to a new page, > or > > >> > > hitrefresh. It'd look something like this (not tested): > > > > >> > > ///////////////////////// > > >> > > Window.addWindowCloseListener( > > >> > > new WindowCloseLisener(){ > > > > >> > > public String onWindowClosing(){ > > >> > > return "Are you sure you want to leave this application?"; > > >> > > } > > > > >> > > public void onWindowClosed(){ > > >> > > // Cleanup if need be > > >> > > }}); > > > > >> > > //////////////////////////////// > > > > >> > > On Mar 13, 2:52 pm, dodo <[email protected]> wrote: > > > > >> > > > GWT provides History.onHistoryChange event to handle history but > how > > >> > > > can we restore application state when a user clicks > onRefreshbutton? > > >> > > > For example the user performed multiple actions on the web site > and > > >> > > > then clickedrefreshbutton. Now how using GWT History class we > can > > >> > > > restore the same state? > > > > >> > > > Another question, is there a way to trap "Refresh" click before > > >> > > > actually the app refreshes and can be cancel the event? > > > > >> > > > Rajesh- Hide quoted text - > > > > >> > > - Show quoted text - > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~----------~----~----~----~------~----~------~--~---
