how to write python code in the zope page template

Question

I am very new to Zope and Plone. I am trying to write python code in the index_html page. I have the list of objects of type person, now I want to reorder them. So, what I had before was:

<ul tal:define="persons python: context.portal_catalog(portal_type='Person');">
<tal:listing repeat="p persons">

Now I have this python code before the <tal:listing...

<?python
  order=[0,2,1]
  persons = [persons[i] for i in order]
?>

But somehow the order of the person remains the same. Also, I also don't like this way of writing python code in the view. Is there any way I could use this code for changing the order of the list?

The ` ?>` syntax is not supported at all by Zope page templates. Where did you find that syntax? — Martijn Pieters, Jul 25 '12 at 13:44
I found it from www.mail-archive.com/zpt@zope.org/msg00046.html . I realized that if i change the persons to new_persons in python code and try to access it in , it doesn't know about this new_person! I think I should write this python code somewhere else. Currently I am writing it in the browser template! Where should I write this code and how do I access this code on the template? — Sadiksha Gautam, Jul 25 '12 at 13:47
Ah, that is someone *asking* for a feature, not describing what ZPT can do. :-) — Martijn Pieters, Jul 25 '12 at 13:49
but is there anyway i can change the order of the list person? — Sadiksha Gautam, Jul 25 '12 at 13:50

Martijn Pieters · Accepted Answer · 2012-07-25T13:53:19.670

4

Zope pagetemplates do not support a <? ?> syntax at all.

However, you can loop over your python list in the tal:repeat just fine:

<ul tal:define="persons python: context.portal_catalog(portal_type='Person');">
    <tal:listing repeat="i python:[0, 2, 1]">
        <li tal:define="p python:persons[i]" tal:content="p/name">Person name</li>
    </tal:listing>
</ul>

I suspect however, that you want to let the portal_catalog do the sorting instead, using the sort_on parameter (see the Plone KB article on the catalog):

<ul tal:define="persons python: context.portal_catalog(portal_type='Person', sort_on='sortable_title');">
    <tal:listing repeat="p persons">
        <li tal:content="p/name">Person name</li>
    </tal:listing>
</ul>

If you want to do anything more complex, use a browser view to do the list massaging for you.

edited Jul 25 '12 at 13:53

answered Jul 25 '12 at 13:48

Martijn Pieters

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But is it a good practice to handle logic in the view? And where do you define the "sortable_title" in the class Person.py? – Sadiksha Gautam Jul 25 '12 at 14:08
It's better to push logic to views, but small amounts of ordering and such can be handled in the template. – Martijn Pieters Jul 25 '12 at 14:12
'sortable_title' is an index defined by Plone in the portal_catalog, you have nothing to declare for using it. – Jihaisse Jul 25 '12 at 14:30
But when I use the same thing and run it it gives me error saying that "sortable_title" is not defined anywhere! – Sadiksha Gautam Jul 25 '12 at 14:32
Sounds like you are forgetting to put quotes around `sortable_table`; it is a python string, not a variable name. – Martijn Pieters Jul 25 '12 at 18:51

how to write python code in the zope page template

1 Answers1