Carousels
^^^^^^^^^
This feature fully integrates the creation and management of book carousels
into Evergreen, allowing for the display of book cover images on a library’s
public catalog home page.  Carousels may be animated or static.  They can be
manually maintained by staff or automatically maintained by Evergreen.  Titles
can appear in carousels based on newly cataloged items, recent returns,
popularity, etc.  Titles must have copies that are visible to the public
catalog, be circulating, and holdable to appear in a carousel.  Serial titles
cannot be displayed in carousels.  

Administration
++++++++++++++
This feature introduces the concepts of Carousel Types, Carousels, and Carousel
Library Mappings. The first can be administered in Server Administration
while the latter two can be administerd in Local Administration.

Carousel Types define the attributes of a carousel, such as whether it is
automatically managed and how it is filtered.  A carousel must be associated
with a carousel type to function properly.    

There are five stock Carousel Types:

  * Newly Cataloged Items - titles appear automatically based on the active date of the title’s copies
  * Recently Returned Items - titles appear automatically based on the mostly recently circulated copy’s check-in scan date and time  
  * Top Circulated Titles - titles appear automatically based on the most circulated copies in the Item Libraries identified in the carousel definition; titles are chosen based on the number of action.circulation rows created during an interval specified in the carousel definition and includes both circulations and renewals
  * Newest Items by Shelving Location - titles appear automatically based on the active date and shelving location of the title’s copies 
  * Manual - titles are added and managed manually by library staff

While additional Carousel Types can be added using the administration
interface, new automatic types currently require additional Perl code
to be recognized.

Carousel definitions allow the operator to specify the type, owner,
name and, for automatically-maintained types, the item libraries and
shelving locations to look for titles to populate the carousels as
well as how far back to look for titles.

Carousel Library Mappings specify the libraries that the carousel
should be displayed out. The visibility of a carousel at a given organizational
unit is not automatically inherited by the descendants of that unit.  The
carousel’s owning organizational unit is automatically added to the list of
display organizational units.

A server-side job, refresh_carousels.srfsh, is available to periodically
refresh the contents of automatic carousels.

Staff Interface
+++++++++++++++
Each carousel has a record bucket associated with it. Library staff can
add titles to a carousel's bucket, and for the manual Carousel Type, that
is the only way to populate the carousel. Records added to an automatic
carousel's bucket will be removed whenever the carousel is next
refreshed.

Public Catalog
++++++++++++++
A new Template Toolkit macro called “carousels” allows the Evergreen
administrator to inject the contents of one or more carousels into any point in
the OPAC.  The macro will accept the following parameters:

  * carousel_id
  * dynamic (Boolean, default value false)
  * image_size (small, medium, or large)
  * width (number of titles to display on a “pane” of the carousel)
  * animated (Boolean to specify whether the carousel should automatically cycle through its panes)
  * animation_interval (the interval (in seconds) to wait before advancing to the next pane)

If the carousel_id parameter is supplied, the carousel with that ID will be
displayed.  If carousel_id is not supplied, all carousels visible to the public
catalog’s physical_loc organizational unit is displayed.