Now I see that I can make with web2py templates almost everything :).
Massimo, I really think, You should add this recipes to howto :)
@yarko:
sometimes there is no staight way to modify something in controller.
But ok, I modify it, and then i loop them again in template -> so
there are two loops. One more than using filter in template ;)
How to write multiline python code in filter ?? I cannot find real
example for this momemt...
but maybe, replacing something in part of list/dictionary etc.
On 12 Paź, 23:49, yarko <[EMAIL PROTECTED]> wrote:
> This looks like only a stylistic discussion to me....
>
> Django has this too, and Jinja you say have a "shell like" syntax of
> "pipes" --- that is output of one operation feeds input of another.
> n
> {{ car | prime | paint }} is equivalent to {{ paint(prime(car)) }},
> or for that matter {{ car.paint().prime() }}
>
> Functionally, I don't see anything you can do one way over the
> other..... it's a matter of style, convenience, what your used to,
> what you like reading.
>
> I like the "pipeline" syntax, but I learned on UNIX in the mid-70's,
> so it's almost "genetic" for me to just read that. The downside to
> that is that you can get lulled into putting too much processing in
> the template ... precisely because it's so readable.
>
> Having a utility function in a module, or a application local function
> in a controller is - as you say - doable.
>
> But the more worthwhile thing is thinking about what you want to do,
> and putting it in a good place. And making the template as concise
> as makes sense.
>
> re: one loop more on contoller side - not sure I follow you on that.
> Wherever you write the filters, they are running (in these examples)
> on the server, applied similarly, and when they are done, the
> resulting output is rendered into something sent out over the
> network... You could look at how many "calls" you have when snippets
> are in the template vs. explicitly defined utility functions, but I
> think this is more about the patterns of code maintenance (and
> reading) than anything...
>
> I think it probably would not be hard to apply a transform to
> templates so that you can pile up calls with the "pipeline" flavor of
> showing transfer of control. But, other than end user reading - and
> what it might encourage about development steps - I don't think it
> materially changes anything.
>
> Am I missing something?
>
> Kind regards,
> Yarko
>
> On Oct 12, 4:30 pm, pigmej <[EMAIL PROTECTED]> wrote
>
> > massimo,
>
> > filters... ok but what if I need to make more operations with strings
> > etc, python operations, imports, parsing something ?
> > More lines of code.
>
> > For example I need to operate on dictionaries ( defining new, parsing
> > etc )
>
> > Theoretically, I can apply filters on controller side... but then
> > there is one ( or more ) loop more.
>
> > On 12 Paź, 23:01, mdipierro <[EMAIL PROTECTED]> wrote:
>
> > > You can do both:
>
> > > 1) Example of passing variables to parent.
> > > Here is layout.html
>
> > > <html><body><h1>{{=title}}</h1><p>{{include}}</p></body></html>
>
> > > and here is an example of index.html
>
> > > {{title='something'}}
> > > {{extend 'layout.html'}}
> > > Hello World
>
> > > Also are variables returned by the action and defined in models are
> > > also passed to the parent.
>
> > > 2) Example of a filter.
> > > You cannot filter HTML (because it does not make sense since you write
> > > it) but you can filter TEXT (coming from a variable for example) and
> > > the output of helpers. For example the following filter replaces
> > > newlines with <br />, sanitize everything else and wraps everything in
> > > a <p>.
>
> > > {{def myfilter(s):}}
> > > <p>{{=XML(str(s).replace('\n','<br />),sanitize=False)}}</p>
> > > {{return}}
>
> > > {{=myfilter("""Any<span>html code that
> > > you</span> like.""")
> > > {{=myfilter(H1(SPAN('Hello\nWorld')))}}
>
> > > Massimo
>
> > > On Oct 12, 3:42 pm, pigmej <[EMAIL PROTECTED]> wrote:
>
> > > > thanks for reply.
>
> > > > Python is templating engine - thats really good.
>
> > > > But I can only include file in one place and there is no way to change
> > > > anything in parrent file. That's a minus, and the minor problem for
> > > > mine.
>
> > > > The same thing with filters/macros. I need to use the same macro/
> > > > filter in many files. I cannot find this "option" in web2py
> > > > templates...
>
> > > > On 12 Paź, 22:11, yarko <[EMAIL PROTECTED]> wrote:
>
> > > > > Also - if you want to use Genshi Templates (or try to do something
> > > > > similar for Jinja2), see the Genshi4web2py.py file and instructions
> > > > > here:
>
> > > > >http://mdp.cti.depaul.edu/AlterEgo/default/show/162
>
> > > > > On Oct 12, 2:59 pm, yarko <[EMAIL PROTECTED]> wrote:
>
> > > > > > There have been several discussions on this list on the topic - for
> > > > > > example, look
> > > > > > throughhttp://groups.google.com/group/web2py/browse_thread/thread/1ef4eea826...
>
> > > > > > I think a raesonable summary is:
>
> > > > > > - web2py's templating, being very close to just being Python, is
> > > > > > likely to continue to be default for some time;
> > > > > > - some people have written tools to convert skins for other
> > > > > > templates
> > > > > > to convert to web2py, so if it's available graphic designs you want,
> > > > > > that's one way to go
> > > > > > - there has been talk about still allowing an interface for other
> > > > > > engines.
>
> > > > > > I think interest (beyond one of discussion) has not been strong
> > > > > > enough
> > > > > > for someone to identify all the core web2py things that would have
> > > > > > to
> > > > > > be moved into a module, and rewritten for another template engine.
> > > > > > This has spurned talk and work about modules for web2py, T2 being
> > > > > > one
> > > > > > example. It has not yet spurned a design analysis of where all the
> > > > > > boundaries are, and what it would take to implement that.
>
> > > > > > As for documentation, there's Chapter 5 of the web2py book... but
> > > > > > basically, the template language is python, the helper functions are
> > > > > > named after HTML, so you can discover them and use them as you would
> > > > > > expect (<h2>This Heading</h2> ==> H2('This Heading') ) with all the
> > > > > > named paramteres that w3c defines to h2 (for example) mirrored in
> > > > > > H2(). There is a genshi translator (search these forums) and there
> > > > > > is also Massimo's quick demonstraton of a layout builder - see the
> > > > > > link onhttp://www.web2py.com. The builder has a link on it to
> > > > > > download the result of your layout experimentation.
>
> > > > > > Those are probably good starting places.
>
> > > > > > Hope this was helpful.
>
> > > > > > Regards,
> > > > > > Yarko
>
> > > > > > On Oct 12, 2:27 pm, pigmej <[EMAIL PROTECTED]> wrote:
>
> > > > > > > Is there any way to change default template engine in web2py?
>
> > > > > > > I would like to change it to something better with more features
> > > > > > > like
> > > > > > > Jinja2
>
> > > > > > > Or maybe there is a lot of undocumented things in default template
> > > > > > > engine ?
>
>
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