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Templates
=========
A *template* is a file on disk which can be used to render data
provided by a *view*.
Default Templating With z3c.pt Page Templates
------------------------------------------------
Like Zope, :mod:`repoze.bfg` uses Zope Page Templates (ZPT) as its
default templating language. However, :mod:`repoze.bfg` uses a
different implementation of the ZPT specification: the :term:`z3c.pt`
templating engine. This templating engine complies with the `Zope Page
Template <http://wiki.zope.org/ZPT/FrontPage>`_ template
specification. While :term:`z3c.pt` doesn't implement the *METAL*
specification (feature or drawback, depending on your viewpoint), it
is significantly faster.
Given a template named ``foo.html`` in a directory in your application
named "templates", you can render the template in a view via::
from repoze.bfg.template import render_template_to_response
return render_template_to_response('templates/foo.html', foo=1, bar=2)
You associate a view with a URL by adding information to your ZCML.
.. sourcecode:: xml
<bfg:view
for=".models.IMapping"
view=".views.contents_view"
name="contents.html"
/>
:mod:`repoze.bfg` loads the template and keeps it in memory between
requests. This means that modifications to the ZPT require a restart
before you can see the changes.
Templating with XSLT
------------------------
:mod:`repoze.bfg` also supports XSLT as an optional templating
language. Like ZPT, an XSLT template is loaded once and re-used
between requests.
Given a template ``foo.xsl`` in the templates directory, you can render
an XSLT as follows::
from repoze.bfg.template import render_transform_to_response
from lxml import etree
node = etree.Element("root")
return render_transform_to_response('templates/foo.xsl', node)
As shown, the second argument to ``render_transform_to_response`` is
the element (and children) that you want as the top of the data for
the XSLT.
You can also pass XSLT parameters in as keyword arguments::
from repoze.bfg.template import render_transform_to_response
from lxml import etree
node = etree.Element("root")
value1 = "'app1'"
return render_transform_to_response('templates/foo.xsl', node, param1=value1)
This would then assign 'app1' as the value of an ``<xsl:param
name="param1"/>`` parameter in the XSLT template.
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