Faceted navigation filter for collection or contentlisting tiles.

This Plone 5 addon allows you to filter listing results for fields which are indexed in the catalog (Plones internal search tool). For example, you can add a subject filter, but also a filter for authors or portal types.

The filter types can be extended (see: collective.collectionfilter.vocabularies).

There are three portlets/tiles available for filtering:

Collection Filter

a list with values (select, radio, checkbox, link) you can filter on

Collection Search

a SearchableText input field to do a fulltextsearch on the collection results

Collection Maps

a LeafletJS map which shows and filters IGeolocatable items on it (this feature is available if collective.geolocationbehavior is installed and the behavior is activated on a contenttype. See installation notes below)

Collection Result Listing Sort

a list of indexes where the user can sort the filtered result listing

Add as many filter/search portlets directly to a collection.

When you select values from the filter the results are loaded asynchronously onto the page (no page refresh). Unless you turn off ajax loading in the registery or are using Plone 5.0. If you are using special theme or view template you can customize Content Selector and/or `View Template` to ensure ajax loading works correctly. Make sure the selector exists on the source collection template and on the target page which shows the filtered results.

It is also possible to use filter portlets that aren't directly on a collection by specifying a target collection. To use ajax loading you will need to ensure your content selector is visible on the page. If not using ajax loading selecting a filter option will redirect you to the collection.

Use the package extra to install the required dependencies:

[buildout]
...
eggs +=
    collective.collectionfilter[mosaic]
...

The three tiles can be added within the Mosaic editor multiple times. Just select them in the Insert menu and assign a collection to it. To show the results of the collection simply add a Content Listing tile.

It's possible to use multiple content listings and multiple filters on the same page by specifying additional unique classes in the listing tiles settings and then adding these classes to the Content Selector setting of the filter tile.

If you want to use filter tiles with a collection then add a content listing tile with the setting to use the query from the context. It is also possible to use the Embed content tile if there is a unique selector on your collection view.

If collective.geolocationbehavior is installed, this package provides a LeafletJS Maps tile/portlet which shows each item of a collection result if the IGeolocatable information is available. In addition you can activate the Narrow down results checkbox to narrow down the collection result and other available filter tiles/portlets if the user moves or zooms the map.

We provide a package extra to install all required dependencies with their according versions. Simply do this somewhere in your buildout:

[buildout]
...
eggs +=
    collective.collectionfilter[geolocation]
...

collective.collectionfilter.vocabularies.GroupByCriteria is a singleton, registered as global utility and used to provide a list of possible indices, which grouped values will provide your filter criteria.

It uses a data structure like this:

self._groupby = {
    it: {                   # Index name
        'index': it,             # Name of the index to use
        'metadata': it,          # Name of the metadata column to use
        'display_modifier': _ ,  # Function to prepare the metadata column value for displaying
        'index_modifier': None,  # Function to transform the index search value.
        'value_blacklist': [],   # Blacklist of index values, which should not included in the filter selection. Can be a callable.
        'sort_key_function': lambda it: it['title'].lower(),  # sort key function. defaults to a lower-cased title
    }
    for it in metadata
}

As you can see, the standard GroupByCriteriaVocabulary implementation implies, that the index name is the same as the metadata column name. Also, we use the collective.collectionfilter message catalog as standard display_modifier (you can register translations under the collective.collectionfilter domain to translate index values).

If you need a special display_modifier, or index or metadata columns do not have the same identifier, you can modify this data structure. For that, register an adapter for IGroupByModifier, which adapts to the GroupByCriteria utility. Within this adapter, you can modify the already populated _groupby attribute (do not use the groupby, which is a property method and at this point hasn't finished).

This is how.

Write an adapter:

# -*- coding: utf-8 -*-
from collective.collectionfilter.interfaces import IGroupByCriteria
from collective.collectionfilter.interfaces import IGroupByModifier
from zope.component import adapter
from zope.interface import implementer


sort_map = {
    'VALUE1': 3,
    'VALUE2': 1,
    'VALUE3': 2,
}


def subjectsort(it):
    # Sorts the value after a fixed sort map
    val = it['title']
    return sort_map.get(val, 0)


@implementer(IGroupByModifier)
@adapter(IGroupByCriteria)
def groupby_modifier(groupby):
    groupby._groupby['Subject']['display_modifier'] = lambda x, idx: x.upper()
    groupby._groupby['Subject']['sort_key_function'] = subjectsort
    groupby._groupby['my_new_index'] = {
        'index': 'my_new_index',
        'metadata': 'my_new_index_metadata_colum',
        'display_modifier': lambda it, idx: u'this is awesome: {0}'.format(it)
    }

Register the adapter:

<configure xmlns="http://namespaces.zope.org/zope">
  <adapter factory=".collectionfilter.groupby_modifier" name="modifier_1" />
</configure>

Done.

Your adapter is called by collective.collectionfilter.vocabularies.GroupByCriteria.groupby.

• Version 5.x is compatible with Plone 6.x+
• Version 4.x is compatible with Plone 5.2+
• Version 3.x is compatible with Plone 5.0.x and 5.1.x

If your theme doesn't work well with AJAX loading this can be overridden in the registery or via diazo.

• Johannes Raggam
• Peter Holzer

This package is based on collective.portlet.collectionfilter and collective.portlet.collectionbysubject.