z3c.preference 2.0

UI for zope.preference using z3c.pagelet and z3c.form.

This packages provides a user interface for zope.preference using z3c.pagelet and z3c.form.

Contents

• Changes

  • 2.0 (2023-02-21)

  • 1.0 (2018-12-21)

  • 0.5 (2013-03-09)

  • 0.4 (2012-04-20)

  • 0.3 (2012-03-15)

  • 0.2 (2012-02-23)

  • 0.1.1 (2010-07-17)

  • 0.1.0 (2010-07-10)

• Overview

• Using z3c.preference

• Editing preferences

  • Set up for tests

  • Editing preferences using browser

• Editing preference group trees

  • Set up

  • Editing preference group trees using browser

• To do

Changes

2.0 (2023-02-21)

• Drop support for Python 2.7, 3.5, 3.6.

• Add support for Python 3.8, 3.9, 3.10, 3.11.

1.0 (2018-12-21)

• Update tests to zope.testbrowser >= 5.

• Add support for Python 3.6 and 3.7.

0.5 (2013-03-09)

• Sorting preferences in CategoryEditForm by their id to stabialize sort order.

0.4 (2012-04-20)

• Descriptions of preference groups are now rendered in the group-header slot of the form above the error messages for the group.

• Fixed description of version 0.3, it actually added descriptions for preference categories, not preference groups.

0.3 (2012-03-15)

• Descriptions of preference categories are now rendered in the extra-info slot of the form.

0.2 (2012-02-23)

• Added form for preference categories, see Editing preference group trees.

0.1.1 (2010-07-17)

• Documented preconditions to use this package, see Using z3c.preference.

0.1.0 (2010-07-10)

• Initial Release.

Overview

z3c.preference renders forms in the browser for the preference sets which were defined using zope.preference.

Using z3c.preference

There are some preconditions to use z3c.preference:

• The views for the ++preferences++ namespace are registered for the layer z3c.preference.interfaces.IPreferenceLayer. So you have to add this interface to the browser layer of your application.

• Only users having the permission z3c.preference.EditPreference are allowed to access the the preference views. So you have to add this permission to the users resp. roles which should be able to access the preferences views.

Editing preferences

Set up for tests

At first we have to define a preference interface:

>>> import zope.interface
>>> import zope.schema
>>> class IBackEndSettings(zope.interface.Interface):
...     """Backend User Preferences"""
...
...     email = zope.schema.TextLine(
...         title=u"E-mail Address",
...         description=u"E-mail address used to send notifications")
...
...     skin = zope.schema.Choice(
...         title=u"Skin",
...         description=u"The skin that should be used for the back end.",
...         values=['Hipp', 'Lame', 'Basic'],
...         default='Basic')
...
...     showLogo = zope.schema.Bool(
...         title=u"Show Logo",
...         description=u"Specifies whether the logo should be displayed.",
...         default=True)

The interface must be registered for preferences:

>>> from zope.configuration import xmlconfig
>>> import zope.preference
>>> context = xmlconfig.file('meta.zcml', zope.preference)

>>> context = xmlconfig.string('''
...     <configure
...         xmlns="http://namespaces.zope.org/zope"
...         i18n_domain="test">
...
...       <preferenceGroup
...           id="BackEndSettings"
...           title="Back End Settings"
...           schema="z3c.preference.README.IBackEndSettings"
...           />
...
...     </configure>''', context)

To access the forms a browser is needed, the user must be authorized as the preferences are stored in the principal annotations:

>>> from zope.testbrowser.wsgi import Browser
>>> browser = Browser()
>>> browser.addHeader('Authorization', 'Basic mgr:mgrpw')

Editing preferences using browser

There is a namespace to access the preferences. On the page a form is displayed which shows the default values:

>>> browser.open('http://localhost/++preferences++/BackEndSettings')
>>> browser.getControl('E-mail Address').value
''
>>> browser.getControl('Skin').displayValue
['Basic']
>>> browser.getControl('yes').selected
True
>>> browser.getControl('no').selected
False

The values can be changed and submitting the form makes them persistent:

>>> browser.getControl('E-mail Address').value = '[e-mail]'
>>> browser.getControl('Skin').displayValue = ['Hipp']
>>> browser.getControl('no').click()
>>> browser.getControl('Apply').click()

After submitting the form gets displayed again and shows the changed values:

>>> 'Data successfully updated.' in browser.contents
True
>>> browser.getControl('E-mail Address').value
'[e-mail]'
>>> browser.getControl('Skin').displayValue
['Hipp']
>>> browser.getControl('no').selected
True

Editing preference group trees

zope.preference has the concept of preference group trees and preference categories to group preferences.

If a preference category is displayed using z3c.preference automatically all preference groups belonging to the category are rendered as groups in the edit form (aka GroupForm).

Note: Currently only the preference category and its direct children are rendered in the tree.

Set up

At first we have to define some preference interfaces presenting the tree. In this example we think of a web application with some areas:

>>> import zope.interface
>>> import zope.schema
>>> class IGeneralSettings(zope.interface.Interface):
...     """General preferences"""
...
...     language = zope.schema.Choice(
...         title=u"Language",
...         description=u"The language which should be used for display.",
...         values=['German', 'English', 'Russian'],
...         default='German')

>>> class IRSSSettings(zope.interface.Interface):
...     """Preferences for the RSS area of the application."""
...
...     number = zope.schema.Int(
...         title=u"Item count",
...         description=u"Maximum number of items in each feed.")

>>> class ISearchSettings(zope.interface.Interface):
...     """Preferences for the search area of the application."""
...
...     store_searches = zope.schema.Bool(
...         title=u"Store searches?",
...         description=u"Should searches be kept for later use?",
...         default=True)

The interfaces must be registered for preferences:

>>> from zope.configuration import xmlconfig
>>> import zope.preference
>>> context = xmlconfig.file('meta.zcml', zope.preference)

>>> context = xmlconfig.string('''
...     <configure
...         xmlns="http://namespaces.zope.org/zope"
...         i18n_domain="test">
...
...       <preferenceGroup
...           id="app"
...           title="General Settings"
...           description="Settings for the whole app"
...           schema="z3c.preference.categories.IGeneralSettings"
...           category="true"
...           />
...
...       <preferenceGroup
...           id="app.search"
...           title="Search Settings"
...           schema="z3c.preference.categories.ISearchSettings"
...           category="false"
...           />
...
...       <preferenceGroup
...           id="app.rss"
...           title="RSS Settings"
...           description="Settings for the RSS feeds"
...           schema="z3c.preference.categories.IRSSSettings"
...           category="false"
...           />
...
...     </configure>''', context)

To access the forms a browser is needed, the user must be authorized as the preferences are stored in the principal annotations:

>>> from zope.testbrowser.wsgi import Browser
>>> browser = Browser()
>>> browser.addHeader('Authorization', 'Basic mgr:mgrpw')

The form displays the titles and descriptions of the categories:

>>> browser.open('http://localhost/++preferences++/app')
>>> print(browser.contents)
<!DOCTYPE ...
...General Settings...
...Settings for the whole app...
...RSS Settings...
...Settings for the RSS feeds...
...Search Settings...

Editing preference group trees using browser

There is a namespace to access the preferences. On the page a form is displayed which shows the default values:

>>> browser.open('http://localhost/++preferences++/app')
>>> browser.getControl('Language').displayValue
['German']
>>> browser.getControl('Item count').value
''
>>> browser.getControl('yes').selected
True
>>> browser.getControl('no').selected
False

The values can be changed and submitting the form makes them persistent:

>>> browser.getControl('Language').displayValue = ['English']
>>> browser.getControl('Item count').value = '20'
>>> browser.getControl('no').click()
>>> browser.getControl('Apply').click()

After submitting the form gets displayed again and shows the changed values:

>>> 'Data successfully updated.' in browser.contents
True
>>> browser.getControl('Language').displayValue
['English']
>>> browser.getControl('Item count').value
'20'
>>> browser.getControl('no').selected
True

To do

• Document how to use it in own projects. (ZCML and skin)