1 Apr
2006
1 Apr
'06
9:26 a.m.
Hi,
I'm new to smalltalk, seaside and pier. I want to
use pier to host
a small
site, and if possible, I'd like to change the way internal links to
other
pages are rendered, so that the wiki text:
*Introduction>introduction*
produces the link:
http://localhost:9090/seaside/pier/information/introduction
instead of:
http://localhost:9090/seaside/pier/information/introduction?
view=PRDefaultView&command=PRViewCommand&_k=jFcQckKB&25&_s=lEBbpcqiBRM
HlTFF
this is simple to do, have a look #goto: in WAAnchorTag. However I
strongly discourage you doing this, since ...
- it will start a new session every time you click a link.
- you will loose all the state of your application when clicking a
link, e.g. most widgets won't work anymore.
- waste a lot of memory and cpu-time on the server, because the url
has to be parsed and all Seaside components have to be rebuild and
reinitialized on every click.
Both links return the same URL when typed into the
browser, so clearly
view is the default command. I've tried searching around for
information
about this but I couldn't find anything obvious to me. While
browsing the
source code, I came across WAUrl adaptToContext: and WAAnchorTag
goto:,
which look potentially relevant, but I'm honestly not sure if I'm
on the
right track. I'd appreciate it if someone could point me in the right
direction. Also, if this is a really bad idea for some reason, that
would
also be good to know.
Yes, these two methods [1,2] are definitely the ones your are
interested in. Let me try to explain the background of these methods:
Seaside only parses the URL on the first request, else it will only
perform the callback (as defined in [1] by #registerActionCallback:)
and ignore all the rest.
So why the heck I am doing so many thing with the generated URL, if
Seaside is not using it at all? It basically makes it possible to
preserve some state when bookmarking the URL, when opening the URL
within a new window, or when sending it to friends. If the argument
'_s' (Session) is invalid (mostly because of a timeout, or maybe
because of a session-protector), Pier will try to restore the state
from the URL and bring back the user at the right place.
To conclude, you cannot shorten the URL in the anchors without
scarifying functionality.
That's life,
Lukas
[1] WAAnchorTag>>goto: aContext
"Initialize the receiver to properly activate aContext when being
clicked. This includes a callback and a human-readable and
bookmarkable url."
| actionUrl |
aContext isValid
ifFalse: [ ^ self class: 'protected'; url: '#' ].
actionUrl := canvas context actionUrl withParameter: (canvas callbacks
registerActionCallback: [ PRCurrentContext value: aContext ]).
self url: (actionUrl adaptToContext: aContext) displayString
[2] WAUrl>>adaptToContext: aContext
path := aContext session application baseUrl path copy.
aContext structure parents allButFirst
do: [ :each | self path add: each name ].
aContext command isView
ifTrue: [ self addParameter: 'view' value: aContext command
viewComponentClass name asString ].
self addParameter: 'command' value: aContext command class name
asString
--
Lukas Renggli
http://www.lukas-renggli.ch