So the problem is that you are trying to
#include templateName
where templateName is a runtime variable.
This is only a guess, use cheetah-compile to verify:
The template is compiled in awake.
The included code gets compiled into the cheetah template instance.
By default the cheetah template instance only changes if you edit a
template file and the template recompiles.
chaging the value of T.body changes the instance variable of the current
template, BUT THE TEMPLATE ITSELF is still the original include.
dynamic #includes are a PHP type hack. Cheetah provides templates as
classes so you should do something like
siteMain.template
<head>...
#block body
I am a default page - listing
#end block
moduser.template
#from siteMain import siteMain
#extends siteMain
#implements body
Template inheritence or nested templates are the way to go for your issue.
-Aaron
ps: I could be wrong so I am cc'ing the Cheetah Template list, since
this is a Cheetah issues, not Webware.
"Webware is not responsible for this issue, you need to contact the
Cheetah vendor for support, If then can't help then just reformat and
try again"
Leith Parkin wrote:
Hi Aaron,
The base template contains a stanza #include $body to determine the
body of the page. I do this because i would like to keep the amount of
code in the template defininations as minimal as possible, limited to
simple #if's and #for's.
The page's are rendering correctly - to a point. The problem is that
when serverlet.process() is called, logging the values in
self.transaction() shows that process() is being called correctly, and
following the desired code path, however the output appears to be cached.
In the code below, calling the servlet "view" without any GET
parameters results in T.body using the template
templates/users/list.template, which is correct. Click a link
generated by that page, of the form view?uid=username should then use
T.body as templates/users/moduser.template. The code path followed is
correct, but VivaSite.respond() rendering gives the same output as if
uid= was never passed (eg renders list.template).
Leaving the webpage alone for roughly 5 minutes and hitting refresh
results in the correct template being rendered. I assume this
correlates roughly to VivaSite.awake() being called (which is really
Page.awake() in this case). Is there some kind of behind the scenes
cheetah caching going on?
Sorry if this all sounds a bit confusing. The current system's
templates all work in this manner, but it is all cgi based, and i am
trying to unify it into some kind of application.
Thanks
Leith Parkin
Aaron Held wrote:
I am not sure what should be happening when at the line:
self.T.body = 'templates/users/moduser.template'
if you have something like
$body
in your cheetah template then this will just expand to that string,
not the contents of the template moduser.templet.
check the source of the generated HTML.
You may need to either build the moduser.template in your servlet and
assing the rendered version to T.body
or let moduser.template inherit from basetemplate.
Templates are full object, and moduser.template should inherit from
site.template
(
http://cheetahtemplate.org/docs/users_guide_html_multipage/howWorks.objoriented.html
)
This is what got me into Cheetah to begin with (and the fact that I
was using java velocity at the time)
In theory its great, but in use I got tired of manually recompiling
my templates and restarting webware every time I made a change to a
base template.
Another approach I use it the assing the results of a function to a
template variable.
T.contentBox = self.pageContents()
Then each sub-servlet can just override pageContents.
-Aaron
Leith Parkin wrote:
Hi Aaron,
Thanks for the great tips and urls. Im pretty much on my way now,
however i am getting some strange? behavior, is this the correct
behaviour?
i have a "site" class parent defined as
--- code ---
from pyPgSQL import PgSQL
from mx.DateTime.Parser import DateTimeFromString
from Viva.User import User
from Viva.DBCache import DBCache
from MiscUtils.DBPool import DBPool
# global datapool
datapool = DBPool(PgSQL, 5, database='proptrak', user='leith')
class VivaSite(Page):
def __init__(self):
Page.__init__(self)
self.T = Template(file='templates/base.template')
self.DBCache = DBCache(self.getDBConn())
def respond(self, transaction):
user = User(self.request().remoteUser())
self.T.user = user
self.process(self.request(), self.transaction())
self.write(str(self.T))
#overridden by subclasses
def process(trans):
pass
def getDBConn(self):
return datapool.getConnection()
-- end code --
Then in a servlet i have
-- code --
from VivaSite import VivaSite
from Viva.User import User
class view(VivaSite):
def __init__(self):
VivaSite.__init__(self)
def process(self, request, transaction):
self.T.title = "Viewing users"
self.T.menu = True
# check passwords match
f = request.fieldStorage()
if f.has_key('uid'):
self.T.mod = User(f['uid'].value)
self.T.body = 'templates/users/moduser.template'
self.T.roles = self.DBCache['all_roles']
print f['uid'].value
else:
db = self.getDBConn()
sql = db.cursor()
sql.execute('SELECT * FROM users ORDER BY username ASC')
self.T.body = 'templates/users/list.template'
self.T.results = sql.fetchall() -- end code --
Obviously there is a sitewide template called base.template, which
has a couple of hooks in for pages, such as $body, $title and $menu
to define page rendering. Each servlet sets these vars on
self.T.varname = "value". This has worked flawlessly when the site
was first designed using straight cgi files for each "servlet".
When i call http://server/users/view I get the output generated
of the list.template, even when i call as
http://server/users/view?uid=username. Is this some kind of caching
behaviour? a log call in the view class shows that the transaction
has the properties i would expect. Please let me know if I am
approaching this all from the wrong angle.
Thanks
Leith
Aaron Held wrote:
Anything that the Browser sends comes in via the Request object.
You can access this from a servlet via self.request()
If you check the limited docs (
http://webware.sourceforge.net/Webware-0.8.1/WebKit/Docs/Source/Summaries/HTTPRequest.py.html
)
you will see a method called field.
so to get the value of page out of ShowPage?page=somefile.template
you would have some code like
def writeContent(self):
templateName =
self.request().field('page','default.template')
templateFile=os.path.join(os.path.dirname(os.path.dirname(self.serverSidePath()))
,r'templates',templateName')
#templates are in AppWorkDir\templates
t = Template(file=templateFile,
searchList=[self.getPageData()])
self.write(t)
By the same token anything that you would like to send back to the
browser is in the Response object.
http://webware.sourceforge.net/Webware-0.8.1/WebKit/Docs/Source/Summaries/HTTPResponse.py.html
Calling self.write(t)
causes python to evaluate t as a string, and then pass that
string to the write method and send
it to the browser
A nice Cheetah trick it to pass the servlets Response object to the
cheetah templates respond method.
t.respond(trans=self.transaction())
This causes the results to be sent diretly from the template to the
browser, rather then buffering it up in ram.
-Aaron
Read:
http://webware.sourceforge.net/Papers/Python10.pdf
http://webware.colorstudy.com/twiki/bin/view/Webware/TransactionAnatomy
http://webware.sourceforge.net/Papers/IntroToWebware.html
Leith Parkin wrote:
G'day all,
Ive recently installed webware and have been having a play with
it. I have managed to create a very very simple app that uses
Cheetah templates to produce a static output. I would really love
to extend this futher to handle forms and query string parameters.
Reading the docs that come with the 0.8.1 (basically the class
list) i am a little confused. Once i get a good handle on webware
i intend to replace a intranet system at my workplace which
currently runs as a lot of cgi scripts into some sort of unified
application.
I dont have a overly strong grasp on pythons OO, and am quite new
to this idea of application servers, so am i little confused as to
what methods one needs to override to provide functionality for
say a servelet that is called as ShowPage?page=somefile.template .
A quick search on google has given a few pages, but they seem to
jump over what seems to me a pretty basic concept?
Could someone please point me to a beginners guide that explains
simple concepts like this?
Thanks
Leith
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--
-Aaron
http://www.MetroNY.com/
"I don't know what's wrong with my television set. I was getting
C-Span and the Home Shopping Network on the same station.
I actually bought a congressman."
- Bruce Baum
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