How do I add extra fields (custom captcha) to the registration form in Plone 4.1

问题

I am trying to add a custom captcha to the registration form for my Plone site. I recently upgraded from 3.1.x to 4.1.3 and this broke my existing customizations to the join_form template and validation script.

I have been trying to follow the collective.examples.userdata example to make my customization. I think I have followed the example correctly but the new field is not being rendered into the registration form.

How do I figure out why the extra fields are not showing up and is there a better way to add a custom captcha to the form?

Note that I did try looking at one of the captcha packages for Plone 4 but the the ones I looked at seemed really complicated (one had parts strewn across 3 packages).

Update: Apparently using the stock collective.examples.userdata doesn't work for me either. I add the collective.examples.userdata and I don't get any additional fields on the @@register form.

Also, I am using the old plone 3 fallback template if it makes a difference.

回答1:

This example uses the excellent quintagroup.formlib.captcha widget, but the general approach can apply to many other situations.

Basically, you do not want to define a captcha field in your user data schema; rather, you want to temporarily add it to the form schema when you render the form, in this way:

browser/interfaces.py

from zope.interface import Interface
from quintagroup.formlib.captcha import Captcha
from my.package import myMessageFactory as _


class IMyRegistrationForm(Interface):
    """Marker interface for my custom registration form
    """


class ICaptchaSchema(Interface):
    captcha = Captcha(
        title=_(u'Verification'),
        description=_(
            u'Type the code from the picture shown below.'
        ),
    )

browser/forms.py

from zope.formlib import form
from plone.app.users.browser.register import RegistrationForm
from quintagroup.formlib.captcha import CaptchaWidget
from my.package.browser.interfaces import IMyRegistrationForm, ICaptchaSchema


class MyRegistrationForm(RegistrationForm):
    """ Subclass the standard registration form
    """

    implements(IMyRegistrationForm)

    @property
    def form_fields(self):
        # Get the fields so we can fiddle with them
        myfields = super(MyRegistrationForm, self).form_fields

        # Add a captcha field to the schema
        myfields += form.Fields(ICaptchaSchema)
        myfields['captcha'].custom_widget = CaptchaWidget

        # Perform any field shuffling here...

        # Return the fiddled fields
        return myfields

Finally, register your custom registration form in browser/configure.zcml:

<configure
    xmlns="http://namespaces.zope.org/zope"
    xmlns:browser="http://namespaces.zope.org/browser"
    i18n_domain="my.package">

  <browser:page
      name="register"
      for="Products.CMFPlone.Portal.PloneSite"
      class=".forms.MyRegistrationForm"
      permission="zope.Public"
      />  

</configure>

Tested using collective.examples.userdata and Plone 4.1

回答2:

I don't know the best answer, but it's been discussed at http://comments.gmane.org/gmane.comp.web.zope.plone.user/115264 if you've not already found that.

来源：https://stackoverflow.com/questions/8897730/how-do-i-add-extra-fields-custom-captcha-to-the-registration-form-in-plone-4-1

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