Custom Dexterity Widgets

I'm trying to learn how to create custom widgets for dexterity fields. I started by reading this: http://wiki.zope.org/zope3/Z3cZcml

I haven't gotten all the way through it because it tries to import some modules that don't exist in my vanilla Plone 4 + http://good-py.appspot.com/release/dexterity/1.0b2?plone=4.0 Dexterity install, but before I continue, am I on the right track?

Is there a better set of instructions/demonstration I should use for developing a custom widget, and if not, are these modules missing because I need to install them, or because the instructions are out of date?

>>> from z3c.form.testing import TestRequestTraceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/michael/Plone/buildout-cache/eggs/z3c.form-2.3.3-py2.6.egg/z3c/form/testing.py", line 42, in <module>
    import lxml.html
ImportError: No module named lxml.html

...

>>> from z3c.template.interfaces import IPageTemplate
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named template.interfaces

Thanks,
Michael A. Smith
Web & Digital / Academic Technologies Manager
Nazareth College
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[Martin Aspeli]

Hi,

On 2 October 2010 16:53, Michael Smith <[hidden email]> wrote:

I'm trying to learn how to create custom widgets for dexterity fields.

Correction: You want to learn how to make custom z3c.form widgets; There's nothing Dexterity-specific about widgets.

 

I started by reading this: http://wiki.zope.org/zope3/Z3cZcml

I haven't gotten all the way through it because it tries to import some modules that don't exist in my vanilla Plone 4 + http://good-py.appspot.com/release/dexterity/1.0b2?plone=4.0 Dexterity install, but before I continue, am I on the right track?

I suspect so. I did start writing some more in depth documentation on this, but I never got to the "custom widgets" part. I do want to pick it up again, I just need to get other projects out of the way again.

 

Is there a better set of instructions/demonstration I should use for developing a custom widget, and if not, are these modules missing because I need to install them, or because the instructions are out of date?

I suspect because the instructions are out of date.

You may want to look at something like plone.formwidget.namedfile, which is a pretty simple widget. The z3c.form docs on http://pypi.python.org/pypi/z3c.form are good for reference information as well.

 

>>> from z3c.form.testing import TestRequestTraceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/Users/michael/Plone/buildout-cache/eggs/z3c.form-2.3.3-py2.6.egg/z3c/form/testing.py", line 42, in <module>
   import lxml.html
ImportError: No module named lxml.html

Ah, OK. This is because lxml is a test-time (only) dependency of z3c.form testing stuff. You can add it to your buildout manually or depend on z3c.form [test], I believe.

 

>>> from z3c.template.interfaces import IPageTemplate
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ImportError: No module named template.interfaces

That looks like z3c.template is an optional dependency in this example; you'd need to add it as a dependency of your package, although I'm not aware that it's used in current widgets.

Martin 

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