An introduction to Zope Page Templates and their use outside of Zope (+Audio)
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This document discusses Zope Page Templates (ZPT), which is an implementation of the Template Attribute Language (TAL). ZPT allows separating presentation from logic by using XML/TAL data and templates to generate XHTML or other formats. Some key features of TAL mentioned include making well-formed XHTML easy, optional tag omission, conditional inclusion, and internationalization support. The document provides examples of basic template usage and more advanced features like macros.
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An introduction to Zope Page Templates and their use outside of Zope (+Audio)
- 1. Zope Page Templates file:///home/pptfactory/temp/20090701114008/stencil.jpg An introduction to Zope Page Templates and their use outside of Zope Matt Hamilton matth@netsight.co.uk 30th June 2009 Europython 2009, Birmingham, UK 1
- 2. Who Am I Technical Director of Netsight Web development firm 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 30th June 2009 Europython 2009, Birmingham, UK 2
- 3. The Irony of this talk... Most of it was taken from a talk on PHPTAL! Thanks to Kornel Lesiński who did a file:///home/pptfactory/temp/20090701114008/kornel.jpg talk on it at the Web Standards conference 2008 in London 30th June 2009 Europython 2009, Birmingham, UK 3
- 4. What is ZPT/TAL TAL – Template Attribute Language ZPT – Zope Page Templates ZPT = an implementation of TAL 30th June 2009 Europython 2009, Birmingham, UK 4
- 5. Zope?! I don't DO Zope! file:///home/pptfactory/temp/20090701114008/2512086374_5da1610fc9.jpg 30th June 2009 Europython 2009, Birmingham, UK 5
- 6. TAL is a standard (sort of) Official specification http://wiki.zope.org/ZPT/TAL Multiple implementations http://en.wikipedia.org/wiki/Template_Attribute_Language 30th June 2009 Europython 2009, Birmingham, UK 6
- 7. The Idea of Templating XML/TAL Data Template ZPT XHTML 30th June 2009 Europython 2009, Birmingham, UK 7
- 8. The Idea of Templating XML/TAL Data Template ZPT or or not Plain XHTML XML RSS text 30th June 2009 Europython 2009, Birmingham, UK 8
- 9. Why use templates? Separate Presentation and Logic Keeping code clean Multiple presentations of same data (RSS, JSON, REST, XML) 30th June 2009 Europython 2009, Birmingham, UK 9
- 10. But, why TAL? <ul> % for name in row: <li>${name}</li> % endfor </ul> 30th June 2009 Europython 2009, Birmingham, UK 10
- 11. But, why TAL? <ul> % for name in row: <li>${name}</li> % endfor </ul> <ul> <li tal:repeat=”name row” tal:content=”name” /> </ul> 30th June 2009 Europython 2009, Birmingham, UK 11
- 12. But, why TAL? <ul> <li tal:repeat=”name row” tal:content=”name”> Dummy data </li> </ul> 30th June 2009 Europython 2009, Birmingham, UK 12
- 13. But, why TAL? <ul> <li tal:repeat=”name row” tal:content=”name”> Dummy data </li> </ul> 30th June 2009 Europython 2009, Birmingham, UK 13
- 14. Makes well-formed XHTML easy <ul> <li> % if foo = 'bar': ${name} </li> Nesting % endif Error! </ul> 30th June 2009 Europython 2009, Birmingham, UK 14
- 15. Makes well-formed XHTML easy <ul> <li tal:condition=”python:foo='bar'” tal:content=”name” /> </ul> 30th June 2009 Europython 2009, Birmingham, UK 15
- 16. Makes well-formed XHTML easy Ensures that you close all elements and quote attributes Escapes all ampersands by default & -> & 30th June 2009 Europython 2009, Birmingham, UK 16
- 17. So, how do I use it? Create virtualenv % virtualenv zptdemo Install zope.pagetemplate in virtualenv % cd zptdemo % bin/easy_install zope.pagetemplate 30th June 2009 Europython 2009, Birmingham, UK 17
- 18. 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) 30th June 2009 Europython 2009, Birmingham, UK 18
- 19. 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> 30th June 2009 Europython 2009, Birmingham, UK 19
- 20. 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> 30th June 2009 Europython 2009, Birmingham, UK 20
- 21. 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 30th June 2009 Europython 2009, Birmingham, UK 21
- 22. 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 30th June 2009 Europython 2009, Birmingham, UK 22
- 23. 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 30th June 2009 Europython 2009, Birmingham, UK 23
- 24. Some advanced features file:///home/pptfactory/temp/20090701114008/ninja.jpg ( but not too many ) 30th June 2009 Europython 2009, Birmingham, UK 24
- 25. 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> 30th June 2009 Europython 2009, Birmingham, UK 25
- 26. 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> 30th June 2009 Europython 2009, Birmingham, UK 26
- 27. METAL macros Internationalisation: <h1 i18n:translate=””>Some text</h1> 30th June 2009 Europython 2009, Birmingham, UK 27
- 28. Questions? matth@netsight.co.uk 30th June 2009 Europython 2009, Birmingham, UK 28
- 29. We are looking for Developers! Come chat to me or drop an email to careers@netsight.co.uk 30th June 2009 Europython 2009, Birmingham, UK 29