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collective.z3cform.norobots provides a "human" captcha widget based on a list of questions/answers.
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collective.z3cform.norobots provides a "human" captcha widget based on a list of question/answer(s).

This captcha can be used :

  • as a (Plone Discussions) captcha plugin
  • as a z3c form field
  • as a PloneFormGen field with collective.pfg.norobots

The widget is based on z3c.form.TextWidget.

Since version 1.4, questions configuration uses a dedicated control panel (using instead of a simple properties sheet. An upgrade step provides migration from earlier versions.

Interface is translated in the following languages: Czech [cs], Danish [da], German [de], Basque [eu], Spanish [es], Suomeksi [fi], French [fr], Dutch [nl], Simplified Chinese [zh_CN] and Italian [it].


I have tested this release with Plone 4.3, Plone 4.2.5 and Plone 4.1.6 (

See previous releases for Plone 4.0.




Getting the module

Add collective.z3cform.norobots to your plone.recipe.zope2instance buildout section e.g.:

eggs =


zcml =

Or, you can add it as a dependency on your own product


Enabling the module

In the Addons control panel, install "Norobots captcha field (collective.z3cform.norobots)".

Add a new question

In the "Norobots widget settings" control panel, add a new line in the field "Norobots question::answer":


Example : What is 10 + 12 ?::22

Answer can contain multiple values delimited by semicolon:


Example : What is 5 + 5 ?::10;ten

Quickly test ?

Download collective.z3cform.norobots and use virtualenv and buildout to test the module:

easy_install virtualenv
cd collective.z3cform.norobots
virtualenv .
source bin/activate
(collective.z3cform.norobots) easy_install zc.buildout
!!! check the buildout config file ``test-plone-base.cfg`` before running !!!
(collective.z3cform.norobots) ln -s test-plone-4.2.x.cfg buildout.cfg
(collective.z3cform.norobots) python
(collective.z3cform.norobots) bin/buildout
[...] be patient... [...]
(collective.z3cform.norobots) ./bin/instance fg

Go to http://localhost:8080, add a new Plone Site and install collective.z3cform.norobots (see above).

Launch tests:

(collective.z3cform.norobots) ./bin/test -s collective.z3cform.norobots

Launch code coverage:

(collective.z3cform.norobots) bin/coverage
(collective.z3cform.norobots) bin/report
And open with a browser htmlcov/index.html

Usage in a z3c form

You can use this widget setting the "widgetFactory" property of a form field:

from zope import interface, schema
from z3c.form import interfaces, form, field, button, validator
from import wrap_form

from collective.z3cform.norobots.i18n import MessageFactory as _
from collective.z3cform.norobots.widget import NorobotsFieldWidget
from collective.z3cform.norobots.validator import NorobotsValidator

class INorobotsForm(interface.Interface):
    norobots = schema.TextLine(title=_(u'Are you a human ?'),
                               description=_(u'In order to avoid spam, please answer the question below.'),

class NorobotsForm(form.Form):
    fields = field.Fields(INorobotsForm)
    fields['norobots'].widgetFactory = NorobotsFieldWidget

# wrap the form with's Form wrapper
NorobotsFormView = wrap_form(NorobotsForm)

# Register Norobots validator for the correponding field in the IContactInfo interface
validator.WidgetValidatorDiscriminators(NorobotsValidator, field=INorobotsForm['norobots'])

for more information see in the plone_forms directory.

Possible problems


Source code

Source code is hosted on Github.

How to contribute and submit a patch ?

Source code and an issue tracker is hosted on Github.


  • Sylvain Boureliou [sylvainb]
  • Mikel Larreategi [erral]
  • Aijun Jian
  • Radim Novotny [naro]
  • Thomas Clement Mogensen [tmog]
  • Peter Mathis [petschki]
  • Petri Savolainen [petri]
  • Helmut Toplitzer
  • Luca Fabbri [keul]
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