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Posted to user@struts.apache.org by Peter Neu <pe...@gmx.net> on 2007/01/19 15:09:32 UTC
Timed Java Script Request & Struts?
Hello,
in one of my endless attempts to fight the evil browser backward button
mechanism I was thinging about this:
Can I make a periodic java script (ajax) request to determine when a user
hit the evil button and tries to work
a page that is not current anymore? Say the user hit the back button and now
resides on the "wrong" page
I make a hidden ajax request and determine he is in the wrong pace. Then I
give him a notice and send him back
to the right place.
Is this possible? How would I make the periodic request?
Cheers,
Pete
Re: Timed Java Script Request & Struts?
Posted by Nuwan Chandrasoma <my...@gmail.com>.
Hi,
I will give a answer for your periodic request call.
you have to use the java script setTimeout() function and do the call
periodically.
eg:-
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title></title>
<script type="text/javascript">
function updateOrderList(){
// write you XHP call here..
setTimeout('updateOrderList()',5000);
}
</script>
<script>
setTimeout('updateOrderList()',5000);
</script>
</body>
</html>
when the pages loads, the scripts tag in the bottom of the pages fires the
setTimeout method which would call the updateOrderList() function in 5000
mili seconds, and in the function you do your ajax call, after this also you
call the you call the same method.. this would spawn a never ending loop
until this page is goes out of the browser window.
Thanks,
Nuwan.
----- Original Message -----
From: "Peter Neu" <pe...@gmx.net>
To: "'Struts Users Mailing List'" <us...@struts.apache.org>
Sent: Friday, January 19, 2007 2:09 PM
Subject: Timed Java Script Request & Struts?
> Hello,
>
>
>
> in one of my endless attempts to fight the evil browser backward button
> mechanism I was thinging about this:
>
>
>
> Can I make a periodic java script (ajax) request to determine when a user
> hit the evil button and tries to work
>
> a page that is not current anymore? Say the user hit the back button and
> now
> resides on the "wrong" page
>
> I make a hidden ajax request and determine he is in the wrong pace. Then I
> give him a notice and send him back
>
> to the right place.
>
>
>
> Is this possible? How would I make the periodic request?
>
>
>
> Cheers,
>
> Pete
>
>
>
>
>
>
>
>
---------------------------------------------------------------------
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Re: AW: Timed Java Script Request & Struts?
Posted by "Frank W. Zammetti" <fz...@omnytex.com>.
Well, I'm first of all not sure the "evil back button" is something you
should be fighting in the first place... there is a whole group of
developers who believe messing with what the button does in any way is bad
design. Their reasons are sound IMO: users expect their browsers to work
a certain way, the back button especially, and trying to defeat that
provides a confusing user experience at best, and an experience they don't
want to stick with at worst (i.e, you'd hate for your client to lose sales
because you somehow disabled the back button!)
Now, that being said, I've historically for one not been in that group,
but that's a consequence of the type of development I've typically done:
very complex back-office applications. The goal with those apps has been
to more or less give a fat-client experience with web technologies (one
could ask why we didn't just do fat clients in the first place, but that's
a debate for another day). In these types of cases, I think you can, and
have to really, get away with a lot more. Popping a new window that
doesn't have a back button for example (which doesn't mean the back
functionality is disabled, it's still accessible via keyboard shortcut,
but at that point it becomes a trainig issue).
So, I think that you first want to make sure you really want to do what
your talking about in the first place. You may instead want to design
your app in such a way that what your trying to eliminate doesn't cause a
problem in the first place.
If you decide you still want to do it, I think you were probably on the
right track... I would probably off the top of my head think of doing like
your saing, fire an AJAX request onLoad of the page. The server part
could be as simple as storing some sort of page ID in session. Return a
response code that indicates whether it is OK for the user to be on that
particular page at that point in time, and redirect or alert if not.
Then again, you probably don't have to even get the server involved: why
not just store the ID in a cookie and check that? Then again, doing it
server-side would allow you to have some more complex logic for determing
when a page is valid or not. It would also have the side benefit of
allowing you to confirm the server is still available... might be nice pop
a message if it goes down, or redirect them to an alternate site,
something like that. Oh yeah, and you'll need to ensure they can't do
anything on the page before the request returns. A transparent GIF sized
to the page with a higher z-index than everything else does the trick,
albeit simplistically.
Now, all of this presupposes Javascript is available, so if there's a
possibility it won't be, your hosed.
So, when all is said and done, is any of this really worth it? That's the
important question to ask I think... I'm pretty sure I wouldn't implement
anything like this in the first place, I'd instead figure out how to make
my app more tolerant of user navigation. Probably less work in the long
run, and almost certainly a better user experience too.
Frank
--
Frank W. Zammetti
Founder and Chief Software Architect
Omnytex Technologies
http://www.omnytex.com
AIM/Yahoo: fzammetti
MSN: fzammetti@hotmail.com
Author of "Practical Ajax Projects With Java Technology"
(2006, Apress, ISBN 1-59059-695-1)
Java Web Parts - http://javawebparts.sourceforge.net
Supplying the wheel, so you don't have to reinvent it!
On Mon, January 22, 2007 4:03 am, Peter Neu wrote:
> Hi Frank,
>
> I just read your post. What would you suggest as a clean solution for the
> backward problem? As suggested before the reload does not happen in all
> browsers when the user hits the backward button.... So what to do?
>
> Cheers,
> Pete
>
>> -----Ursprüngliche Nachricht-----
>> Von: Frank W. Zammetti [mailto:fzlists@omnytex.com]
>> Gesendet: Freitag, 19. Januar 2007 17:50
>> An: Struts Users Mailing List
>> Cc: 'Struts Users Mailing List'
>> Betreff: Re: Timed Java Script Request & Struts?
>>
>> I'm not sure what your suggesting is architecturally a good idea, but
>> that's for you to decide :) I'm all about helping you make it happen
>> regardless, so...
>>
>> In addition to the options others have mentioned, another to consider is
>> the AjaxParts Taglib (APT), a part of Java Web Parts (JWP):
>>
>> http://javawebparts.sourceforge.net/
>>
>> More specifically:
>>
>> http://javawebparts.sourceforge.net/javadocs/javawebparts/ajaxparts/taglib
>> /package-summary.html
>>
>> This will allow you to fire an AJAX request on a timer, without having
>> to
>> write any Javascript. It will work with Struts 1.x, 2.x, or any other
>> (java-based) framework.
>>
>> Frank
>>
>>
>> --
>> Frank W. Zammetti
>> Founder and Chief Software Architect
>> Omnytex Technologies
>> http://www.omnytex.com
>> AIM/Yahoo: fzammetti
>> MSN: fzammetti@hotmail.com
>> Author of "Practical Ajax Projects With Java Technology"
>> (2006, Apress, ISBN 1-59059-695-1)
>> Java Web Parts - http://javawebparts.sourceforge.net
>> Supplying the wheel, so you don't have to reinvent it!
>>
>> On Fri, January 19, 2007 9:09 am, Peter Neu wrote:
>> > Hello,
>> >
>> >
>> >
>> > in one of my endless attempts to fight the evil browser backward
>> button
>> > mechanism I was thinging about this:
>> >
>> >
>> >
>> > Can I make a periodic java script (ajax) request to determine when a
>> user
>> > hit the evil button and tries to work
>> >
>> > a page that is not current anymore? Say the user hit the back button
>> and
>> > now
>> > resides on the "wrong" page
>> >
>> > I make a hidden ajax request and determine he is in the wrong pace.
>> Then
>> I
>> > give him a notice and send him back
>> >
>> > to the right place.
>> >
>> >
>> >
>> > Is this possible? How would I make the periodic request?
>> >
>> >
>> >
>> > Cheers,
>> >
>> > Pete
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
>> For additional commands, e-mail: user-help@struts.apache.org
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
>
---------------------------------------------------------------------
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AW: Timed Java Script Request & Struts?
Posted by Peter Neu <pe...@gmx.net>.
Hi Frank,
I just read your post. What would you suggest as a clean solution for the
backward problem? As suggested before the reload does not happen in all
browsers when the user hits the backward button.... So what to do?
Cheers,
Pete
> -----Ursprüngliche Nachricht-----
> Von: Frank W. Zammetti [mailto:fzlists@omnytex.com]
> Gesendet: Freitag, 19. Januar 2007 17:50
> An: Struts Users Mailing List
> Cc: 'Struts Users Mailing List'
> Betreff: Re: Timed Java Script Request & Struts?
>
> I'm not sure what your suggesting is architecturally a good idea, but
> that's for you to decide :) I'm all about helping you make it happen
> regardless, so...
>
> In addition to the options others have mentioned, another to consider is
> the AjaxParts Taglib (APT), a part of Java Web Parts (JWP):
>
> http://javawebparts.sourceforge.net/
>
> More specifically:
>
> http://javawebparts.sourceforge.net/javadocs/javawebparts/ajaxparts/taglib
> /package-summary.html
>
> This will allow you to fire an AJAX request on a timer, without having to
> write any Javascript. It will work with Struts 1.x, 2.x, or any other
> (java-based) framework.
>
> Frank
>
>
> --
> Frank W. Zammetti
> Founder and Chief Software Architect
> Omnytex Technologies
> http://www.omnytex.com
> AIM/Yahoo: fzammetti
> MSN: fzammetti@hotmail.com
> Author of "Practical Ajax Projects With Java Technology"
> (2006, Apress, ISBN 1-59059-695-1)
> Java Web Parts - http://javawebparts.sourceforge.net
> Supplying the wheel, so you don't have to reinvent it!
>
> On Fri, January 19, 2007 9:09 am, Peter Neu wrote:
> > Hello,
> >
> >
> >
> > in one of my endless attempts to fight the evil browser backward button
> > mechanism I was thinging about this:
> >
> >
> >
> > Can I make a periodic java script (ajax) request to determine when a
> user
> > hit the evil button and tries to work
> >
> > a page that is not current anymore? Say the user hit the back button and
> > now
> > resides on the "wrong" page
> >
> > I make a hidden ajax request and determine he is in the wrong pace. Then
> I
> > give him a notice and send him back
> >
> > to the right place.
> >
> >
> >
> > Is this possible? How would I make the periodic request?
> >
> >
> >
> > Cheers,
> >
> > Pete
> >
> >
> >
> >
> >
> >
> >
> >
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org
Re: Timed Java Script Request & Struts?
Posted by "Frank W. Zammetti" <fz...@omnytex.com>.
I'm not sure what your suggesting is architecturally a good idea, but
that's for you to decide :) I'm all about helping you make it happen
regardless, so...
In addition to the options others have mentioned, another to consider is
the AjaxParts Taglib (APT), a part of Java Web Parts (JWP):
http://javawebparts.sourceforge.net/
More specifically:
http://javawebparts.sourceforge.net/javadocs/javawebparts/ajaxparts/taglib/package-summary.html
This will allow you to fire an AJAX request on a timer, without having to
write any Javascript. It will work with Struts 1.x, 2.x, or any other
(java-based) framework.
Frank
--
Frank W. Zammetti
Founder and Chief Software Architect
Omnytex Technologies
http://www.omnytex.com
AIM/Yahoo: fzammetti
MSN: fzammetti@hotmail.com
Author of "Practical Ajax Projects With Java Technology"
(2006, Apress, ISBN 1-59059-695-1)
Java Web Parts - http://javawebparts.sourceforge.net
Supplying the wheel, so you don't have to reinvent it!
On Fri, January 19, 2007 9:09 am, Peter Neu wrote:
> Hello,
>
>
>
> in one of my endless attempts to fight the evil browser backward button
> mechanism I was thinging about this:
>
>
>
> Can I make a periodic java script (ajax) request to determine when a user
> hit the evil button and tries to work
>
> a page that is not current anymore? Say the user hit the back button and
> now
> resides on the "wrong" page
>
> I make a hidden ajax request and determine he is in the wrong pace. Then I
> give him a notice and send him back
>
> to the right place.
>
>
>
> Is this possible? How would I make the periodic request?
>
>
>
> Cheers,
>
> Pete
>
>
>
>
>
>
>
>
---------------------------------------------------------------------
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Re: Timed Java Script Request & Struts?
Posted by Nuwan Chandrasoma <my...@gmail.com>.
Wow.., I need to start a S2 project ASAP. This is really cool.
Thanks,
Nuwan.
----- Original Message -----
From: "Musachy Barroso" <mb...@wfscorp.com>
To: "Struts Users Mailing List" <us...@struts.apache.org>
Sent: Friday, January 19, 2007 2:42 PM
Subject: Re: Timed Java Script Request & Struts?
> If you are using S2, you can also use Dojo's Timer:
>
> http://dojotoolkit.org/api/#dojo.lang.timing.Timer
>
> regards
> musachy
>
> Peter Neu wrote:
>> Hello,
>>
>>
>> in one of my endless attempts to fight the evil browser backward button
>> mechanism I was thinging about this:
>>
>>
>> Can I make a periodic java script (ajax) request to determine when a
>> user
>> hit the evil button and tries to work
>> a page that is not current anymore? Say the user hit the back button and
>> now
>> resides on the "wrong" page
>>
>> I make a hidden ajax request and determine he is in the wrong pace. Then
>> I
>> give him a notice and send him back
>>
>> to the right place.
>>
>> Is this possible? How would I make the periodic request?
>>
>> Cheers,
>>
>> Pete
>>
>>
>>
>>
>>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
---------------------------------------------------------------------
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AW: Timed Java Script Request & Struts?
Posted by Peter Neu <pe...@gmx.net>.
I'm Using Struts 1.x.
So if there is no guaranteed reload of the page there is no
way to implement a timer? Meaning: I would have to test validity
prior to each submitted request. :o(
-Pete
> -----Ursprüngliche Nachricht-----
> Von: Musachy Barroso [mailto:mbarroso@wfscorp.com]
> Gesendet: Freitag, 19. Januar 2007 15:42
> An: Struts Users Mailing List
> Betreff: Re: Timed Java Script Request & Struts?
>
> If you are using S2, you can also use Dojo's Timer:
>
> http://dojotoolkit.org/api/#dojo.lang.timing.Timer
>
> regards
> musachy
>
> Peter Neu wrote:
> > Hello,
> >
> >
> >
> > in one of my endless attempts to fight the evil browser backward button
> > mechanism I was thinging about this:
> >
> >
> >
> > Can I make a periodic java script (ajax) request to determine when a
> user
> > hit the evil button and tries to work
> >
> > a page that is not current anymore? Say the user hit the back button and
> now
> > resides on the "wrong" page
> >
> > I make a hidden ajax request and determine he is in the wrong pace. Then
> I
> > give him a notice and send him back
> >
> > to the right place.
> >
> >
> >
> > Is this possible? How would I make the periodic request?
> >
> >
> >
> > Cheers,
> >
> > Pete
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
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Re: Timed Java Script Request & Struts?
Posted by Musachy Barroso <mb...@wfscorp.com>.
If you are using S2, you can also use Dojo's Timer:
http://dojotoolkit.org/api/#dojo.lang.timing.Timer
regards
musachy
Peter Neu wrote:
> Hello,
>
>
>
> in one of my endless attempts to fight the evil browser backward button
> mechanism I was thinging about this:
>
>
>
> Can I make a periodic java script (ajax) request to determine when a user
> hit the evil button and tries to work
>
> a page that is not current anymore? Say the user hit the back button and now
> resides on the "wrong" page
>
> I make a hidden ajax request and determine he is in the wrong pace. Then I
> give him a notice and send him back
>
> to the right place.
>
>
>
> Is this possible? How would I make the periodic request?
>
>
>
> Cheers,
>
> Pete
>
>
>
>
>
>
>
>
>
---------------------------------------------------------------------
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