an introduction to zope page templates and their use outside of zope (+audio)
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30th June 2009 Europython 2009, Birmingham, UK 1
Zope Page Templates
An introduction to Zope Page Templates and their use outside of Zope
Matt Hamiltonmatth@netsight.co.uk
30th June 2009 Europython 2009, Birmingham, UK 2
Who Am I
● Technical Director of Netsight→ Web development fi rm in Bristol, UK
● 10 years experience with Zope/Plone● More of an integrator than core developer
→ I get involved in all those sticky projects of merging Plone in with other systems in an enterprise
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The Irony of this talk...
Most of it was taken from a talk on PHPTAL!
Thanks to Kornel Lesiński who did a talk on it at the Web Standards conference 2008 in London
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What is ZPT/TAL
TAL – Template Attribute LanguageZPT – Zope Page Templates
ZPT = an implementation of TAL
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Zope?! I don't DO Zope!
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TAL is a standard (sort of)
Of� cial speci� cation http://wiki.zope.org/ZPT/TAL
Multiple implementations http://en.wikipedia.org/wiki/Template_Attribute_Language
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The Idea of Templating
Data XML/TALTemplate
ZPT
XHTML
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The Idea of Templating
Data XML/TALTemplate
ZPT
XHTML XML RSSPlaintext
or or not
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Why use templates?
●Separate Presentation and Logic●Keeping code clean●Multiple presentations of same data (RSS, JSON, REST, XML)
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But, why TAL?
<ul> % for name in row: <li>${name}</li> % endfor </ul>
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But, why TAL? <ul> % for name in row: <li>${name}</li> % endfor </ul>
<ul> <li tal:repeat=”name row” tal:content=”name” /> </ul>
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But, why TAL?
<ul> <li tal:repeat=”name row” tal:content=”name”> Dummy data </li> </ul>
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But, why TAL?
<ul> <li tal:repeat=”name row” tal:content=”name”> Dummy data </li> </ul>
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Makes well-formed XHTML easy
<ul> <li> % if foo = 'bar': ${name} </li> % endif </ul>
Nesting Error!
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Makes well-formed XHTML easy
<ul> <li tal:condition=”python:foo='bar'”tal:content=”name” /> </ul>
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Makes well-formed XHTML easy
• Ensures that you close all elements and quote attributes
• Escapes all ampersands by default & -> &
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So, how do I use it?
Create virtualenv
% virtualenv zptdemo
Install zope.pagetemplate in virtualenv
% cd zptdemo% bin/easy_install zope.pagetemplate
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So, how do I use it?
In mycode.py:
from zope.pagetemplate.pagetemplatefile \ import PageTemplateFile
my_pt = PageTemplateFile('mytemplate.pt')context = {'row': ['apple', 'banana', 'carrot'], 'foo':'bar'}
print my_pt.pt_render(namespace=context)
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So, how do I use it?
In mytemplate.py:
<html><body><h1>Hello World</h1>
<div tal:condition=”python:foo == 'bar'”><ul><li tal:repeat="item rows" tal:content="item" /></ul></div>
</body></html>
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So, how do I use it?
End result:
<html><body><h1>Hello World</h1>
<ul><li>apple</li><li>banana</li><li>carrot</li></ul></div>
</body></html>
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Some TAL niceties
<a href=”href” tal:omit-tag=”not:href”> Optionally linked text</a>
Omit the tag if there is href variable evaluates false
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Some TAL niceties
<title tal:content=”page/title | site/title | default”> My Website </title>
If there is no page title or site title, then use the default text
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Some TAL niceties
<option tal:repeat=”c countries” tal:content=”c” tal:attributes=”selected python:c==’UK’” />
Create an option for each country, and if the UK then set selected
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Some advanced features
( but not too many )
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METAL macros
A master template:
<html metal:define-macro=”main”> <head><title>My Site</title></head> <body> <div metal:define-slot=”body”> Dummy body </div> </body></html>
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METAL macros
A sub-template for a page:
<html metal:use-macro= ”template/macros/main”> <head><title>My Site</title></head> <body> <div metal:fill-slot=”body”> This is my real body text </div> </body></html>
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METAL macros
Internationalisation:
<h1 i18n:translate=””>Some text</h1>
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Questions?
matth@netsight.co.uk
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We are looking for Developers!
Come chat to me or drop an email to
careers@netsight.co.uk
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