Re: T5 - Catching user leaving a page
Since your problem is similar to serverpush functionality you might also take a look into dwr. They have a chat example which you might use in your Tapestry app. Look here: http://directwebremoting.org/dwr/reverse-ajax
Re: T5 - Catching user leaving a page
Got the onbeforeunload call to work. On the off chance that someone is doing
something similar here's my .tml head.
I'm using jQuery to do an ajax call with a onActionFromLink(String name)
method in my page to remove the user from my trusty singleton. Interesting
gotcha, ie 6 caches all ajax calls by default hence the cache: false. This
works in firefox 3 and ie 6.
chatroom Start Page
var userName = '${currentUserName}';
<!-- //
$(document).ready(function(){
window.onbeforeunload = removeUser
});
function removeUser(){
$.ajax({
type: "GET",
url: "chatroom.link/" +
userName,
cache: false
});
}
// -->
--
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Re: T5 - Catching user leaving a page
Thanks for the posts, I'm going to try using the onbeforeunload method, it seems to have support in most recent browsers. I'd if it works it seems less error prone than a polling system. Is it possible to call methods on one of my tapestry page's methods from a piece of custom javascript? Thanks also for the pointers on the system design, this is really just a simple tech demo to play with tapestry at the moment so I'm not too concerned with how it all hangs together. Barry dhning-2 wrote: > > Hi, > > Maybe T5 would not have any solution for such case, I think this is a > client browser issue, for server doesn't know user has changed > url(SessionListener may know closing browser). > > Maybe you can handle window event 'window.onbeforeunload'(it will be fired > if closing browser, changing url, click lick and so on happen -- leaving > current page), in IE it works, but I am not sure about others. > > Thanks! > > DH > > > - Original Message - > From: "BarryDev" <[EMAIL PROTECTED]> > To: > Sent: Wednesday, October 22, 2008 12:16 AM > Subject: T5 - Catching user leaving a page > > >> >> Hi all, >> >> I've completed the hi/lo and address tutorial and I'm not trying to write >> a >> simple chatroom to learn some more about tapestry. >> >> My basic chatroom currently has a login page which forwards to a chatroom >> which lists the usernames of all logged in users. I'm currently using a >> singleton to store all the users who are logged in and fetch them when >> rendering the chatroom. >> >> What I would like to do next is catch a user leaving the chatroom no >> matter >> what they're do (closing broswer, typing in new url, clicking a link in >> the >> app, hitting back button in browser) so I can remove them from the list >> of >> logged in users. >> >> What's the best mechanism to do this with Tap5, is there a page detached >> event I can register to that will get thrown in all cases? Is it better >> to >> have a bit of javascript on the page which polls another page doing an >> async >> I'm still alive? (I'll probably need to do something like this for >> polling >> for new messages from other users) >> >> Or is there a more elegant solution hidden within T5? I've searched here >> and the docs but haven't been able to find anything. >> >> Regards >> Barry >> -- >> View this message in context: >> http://www.nabble.com/T5---Catching-user-leaving-a-page-tp20093965p20093965.html >> Sent from the Tapestry - User mailing list archive at Nabble.com. >> >> >> - >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] >> >> > -- View this message in context: http://www.nabble.com/T5---Catching-user-leaving-a-page-tp20093965p20110310.html Sent from the Tapestry - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: T5 - Catching user leaving a page
Forgot to mention that I think that the chat system should be a service or series of services that probably keep the state of the chat room via db back end (using suitable amount of on memory cache). Then there would be the still alive poll page that would only signal the service that user is still there, then a page where the actual chat would be. The chat page could be also broken to smaller chunks to improve performance. (One page could supply the contents of currently active chat members etc, and the other could supply the incoming / outgoing messages.) Haven't done anything like that, but that would be the path that I would take. No guarantees though :D - Ville BarryDev wrote: > > Hi all, > > I've completed the hi/lo and address tutorial and I'm not trying to write > a simple chatroom to learn some more about tapestry. > > My basic chatroom currently has a login page which forwards to a chatroom > which lists the usernames of all logged in users. I'm currently using a > singleton to store all the users who are logged in and fetch them when > rendering the chatroom. > > What I would like to do next is catch a user leaving the chatroom no > matter what they're do (closing broswer, typing in new url, clicking a > link in the app, hitting back button in browser) so I can remove them from > the list of logged in users. > > What's the best mechanism to do this with Tap5, is there a page detached > event I can register to that will get thrown in all cases? Is it better > to have a bit of javascript on the page which polls another page doing an > async I'm still alive? (I'll probably need to do something like this for > polling for new messages from other users) > > Or is there a more elegant solution hidden within T5? I've searched here > and the docs but haven't been able to find anything. > > Regards > Barry > -- View this message in context: http://www.nabble.com/T5---Catching-user-leaving-a-page-tp20093965p20104801.html Sent from the Tapestry - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: T5 - Catching user leaving a page
This is more a limitation or the nature of the http and other protocols than a defect in T5. The polling scheme is only possibility that comes to my mind. If the user has not been heard of for a certain amount of time, he/she will be regarded as absent and removed from the room. Of course, what ever the user does to the client to move to another page stops the javascript that is sending the "still alive messages". You're going to have to write some custom js to do this, there isn't needed functionality in T5 that would do this AFAIK. - Ville BarryDev wrote: > > Hi all, > > I've completed the hi/lo and address tutorial and I'm not trying to write > a simple chatroom to learn some more about tapestry. > > My basic chatroom currently has a login page which forwards to a chatroom > which lists the usernames of all logged in users. I'm currently using a > singleton to store all the users who are logged in and fetch them when > rendering the chatroom. > > What I would like to do next is catch a user leaving the chatroom no > matter what they're do (closing broswer, typing in new url, clicking a > link in the app, hitting back button in browser) so I can remove them from > the list of logged in users. > > What's the best mechanism to do this with Tap5, is there a page detached > event I can register to that will get thrown in all cases? Is it better > to have a bit of javascript on the page which polls another page doing an > async I'm still alive? (I'll probably need to do something like this for > polling for new messages from other users) > > Or is there a more elegant solution hidden within T5? I've searched here > and the docs but haven't been able to find anything. > > Regards > Barry > -- View this message in context: http://www.nabble.com/T5---Catching-user-leaving-a-page-tp20093965p20104676.html Sent from the Tapestry - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: T5 - Catching user leaving a page
Hi, Maybe T5 would not have any solution for such case, I think this is a client browser issue, for server doesn't know user has changed url(SessionListener may know closing browser). Maybe you can handle window event 'window.onbeforeunload'(it will be fired if closing browser, changing url, click lick and so on happen -- leaving current page), in IE it works, but I am not sure about others. Thanks! DH - Original Message - From: "BarryDev" <[EMAIL PROTECTED]> To: Sent: Wednesday, October 22, 2008 12:16 AM Subject: T5 - Catching user leaving a page > > Hi all, > > I've completed the hi/lo and address tutorial and I'm not trying to write a > simple chatroom to learn some more about tapestry. > > My basic chatroom currently has a login page which forwards to a chatroom > which lists the usernames of all logged in users. I'm currently using a > singleton to store all the users who are logged in and fetch them when > rendering the chatroom. > > What I would like to do next is catch a user leaving the chatroom no matter > what they're do (closing broswer, typing in new url, clicking a link in the > app, hitting back button in browser) so I can remove them from the list of > logged in users. > > What's the best mechanism to do this with Tap5, is there a page detached > event I can register to that will get thrown in all cases? Is it better to > have a bit of javascript on the page which polls another page doing an async > I'm still alive? (I'll probably need to do something like this for polling > for new messages from other users) > > Or is there a more elegant solution hidden within T5? I've searched here > and the docs but haven't been able to find anything. > > Regards > Barry > -- > View this message in context: > http://www.nabble.com/T5---Catching-user-leaving-a-page-tp20093965p20093965.html > Sent from the Tapestry - User mailing list archive at Nabble.com. > > > - > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > >
T5 - Catching user leaving a page
Hi all, I've completed the hi/lo and address tutorial and I'm not trying to write a simple chatroom to learn some more about tapestry. My basic chatroom currently has a login page which forwards to a chatroom which lists the usernames of all logged in users. I'm currently using a singleton to store all the users who are logged in and fetch them when rendering the chatroom. What I would like to do next is catch a user leaving the chatroom no matter what they're do (closing broswer, typing in new url, clicking a link in the app, hitting back button in browser) so I can remove them from the list of logged in users. What's the best mechanism to do this with Tap5, is there a page detached event I can register to that will get thrown in all cases? Is it better to have a bit of javascript on the page which polls another page doing an async I'm still alive? (I'll probably need to do something like this for polling for new messages from other users) Or is there a more elegant solution hidden within T5? I've searched here and the docs but haven't been able to find anything. Regards Barry -- View this message in context: http://www.nabble.com/T5---Catching-user-leaving-a-page-tp20093965p20093965.html Sent from the Tapestry - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
