[Zope] dynamically generated TAL not being interpreted
Wed, 5 Mar 2003 20:37:48 +0100
N. Thomas wrote at 2003-3-4 23:18 -0500:
> * Dieter Maurer <email@example.com> [2003-03-03 20:56:46 +0100]:
> > N. Thomas wrote at 2003-3-1 23:46 -0500:
> > > We have a script that generates TAL. The problem is that the content
> > > is not being interpeted as TAL by Zope, but rather as raw HTML.
> > You must make a Page Template object from your TAL source code, wrap
> > it in an appropriate context (--> "__of__") and return it (or call it
> > to let it render).
> > You can do this only in an External Method (or other filesystem based
> > code).
> Well, this was a start in the right direction. But after wading through
> the archives, the nearest solution I can cruft together is an external
> method like this:
> from Products.PageTemplates.ZopePageTemplate import ZopePageTemplate
> def talgen():
> zptstr = \
> If properlu rendered,
> this sentence <b tal:omit-tag="">should contain no tags.</b>
> zptid = 'foobar'
> z = ZopePageTemplate(id=zptid, text=zptstr, content_type="text/html")
> return z
> But this returns an error, probably because I'm stabbing in the dark.
Because, you did not do the "__of__" magic...
And, please remember, read error messages (Error Type, Error Values *AND*
traceback) carefully and report them, if you do not understand them.
> Also, I have no idea where exactly to stick the "__of__" method. (I did
> look at the relevant sections in
> http://www.dieter.handshake.de/pyprojects/zope/book/chap3.html though.)
Hm, you did not find the "__of__" mentioned in the "Name lookup section"?
You use "return z.__of__(self)"
> My questions:
> Where is the API for Products.PageTemplates.ZopePageTemplate
I am not sure, probably in the embedded online help.
*BUT* you need nothing than the constructor (you already used)
and the "__call__" method (that is trivial).
> In Products.PageTemplates, should I use PageTemplate, or
> PageTemplateFile, or ZopePageTemplate?
As it is not a file in the file system, you do not use "PageTemplateFile" ;-)
Almost surely, "ZopePageTemplate" is right. "PageTemplate" might
> In the code above, I see that ZopePageTemplate requires that an id
> be passed in, does that mean that I have to create a temporary ZPT
> object in the Zope filesystem, return that, and somehow make sure it
> is destroyed afterwards? I only passed in 'foobar' because it was
No, unless you use special operations (e.g. "template/absolute_url")
what you probably do not do.
> Also, if anyone could point me to a fragment of code that does something
> similar it would be much appreciated.
You are very near :-)
I trust you that you will write a HowTo about dynamic generation
of TAL code, once you solved your problem ;-)