Re: setPageRefreshOnBacktrackEnabled problem?

Chuck Hill <[email protected]> Thu, 26 Apr 2012 12:18:31 -0700
Newsgroups	gmane.comp.web.webobjects.devel
Message-ID	<[email protected]>
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Hi Ondra!

On 2012-04-26, at 6:17 AM, Ond=C5=99ej =C4=8Cada wrote:

> Hello there,
>=20
> either setPageRefreshOnBacktrackEnabled does not work, or I am missing =
something fundamental.

It works.  :-P


> In my "class Application extends ERXApplication" I do =
"setPageRefreshOnBacktrackEnabled(true)". All the HTTP headers are =
generated all right, far as I can say:
>=20
> =3D=3D=3D
> 12 ~P/WebObjects> curl -D - <my app URL>
> HTTP/1.1 200 Apple
> Date: Thu, 26 Apr 2012 13:05:20 GMT
> Server: Apache/2.2.21 (Unix) mod_ssl/2.2.21 OpenSSL/0.9.8r
> cache-control: private
> cache-control: no-cache
> cache-control: no-store
> cache-control: must-revalidate
> cache-control: max-age=3D0
> expires: Sun, 22-Apr-2012 20:37:15 GMT
> pragma: no-cache
> set-cookie: wosid=3DYCGjnZm0l4GhkbB33k27C0; version=3D"1"; =
path=3D/cgi-bin/WebObjects/CEBOIS.woa
> set-cookie: woinst=3D1; version=3D"1"; =
path=3D/cgi-bin/WebObjects/CEBOIS.woa
> connection: close
> content-length: 5452
> MS-Author-Via: DAV
> Content-Type: text/html; charset=3DUTF-8
>=20
> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" =
"http://www.w3.org/TR/html4/loose.dtd">
> ...
> =3D=3D=3D
>=20
> In my session there is "SomeClass foo".
>=20
> In one of my pages, there is (essentially) this:
>=20
> =3D=3D=3D
> <wo:if condition=3D$session.foo> OK <wo:str value=3D$session.foo.title/>=
 </wo>
> <wo:else>
>  <wo:hyperlink action=3D$selectFoo1>Foo1</wo>
>  <wo:hyperlink action=3D$selectFoo2>Foo2</wo>
> </wo>
> =3D=3D=3D
>=20
> with the actions trivial "WOComponent selectFoo1() { =
session().foo=3Dfoo1; return null; }" and similar with Foo2. (There is =
also a "select Foo" action in the OK part which does session().foo=3Dnull,=
 but that's not important here, it works perfectly.)
>=20
> It works perfectly -- till I use backtrack. With backtrack, it goes =
all wrong :(
>=20
> 1. page is opened, shows "Foo1 Foo2"
> 2. "Foo1" is clicked, shows correctly the "OK Foo1.title" contents
> 3. back button is used --> oops, shows again "Foo1 Foo2"!
>=20
> Here I probably am missing something -- given I have set =
pageRefreshOnBacktrackEnabled=3Dtrue, it should show still OK, since my =
session still contains non-null foo, should it not?

Probably.  Is this the first access to your application?  If so, it =
could be making a new page instance each time.


> Anyway, seems no part of my application gets activated at this moment; =
not even appendToResponse logs anything.

Is anything getting to application.dispatchRequest()?


>=20
> 4. "Foo2" is clicked --> oops, shows again "OK Foo1.title"
>=20
> whilst none of the selectFoo1/selectFoo2 actions is ever called. =
appendToResponse is called, though.

That is consistent with setPageRefreshOnBacktrackEnabled(true).

> What am I missing, and, more important, how to fix the problem? I =
don't care whether
> (a) back keeps showing the "OK Foo1.title" contents (
> (b) back goes to "Foo1 Foo2" AND selection works all right.
>=20
> I've googled out a trick based on contextID comparation, but that one =
fails with automatic refresh (which it considers to be same as "back") =
:(


Check what is happening to the contextID when this is going on.


Chuck


--=20
Chuck Hill             Senior Consultant / VP Development

Practical WebObjects - for developers who want to increase their overall =
knowledge of WebObjects or who are trying to solve specific problems.   =20=

http://www.global-village.net/gvc/practical_webobjects









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