Editing Adding new views

[[Category:Manual]]
[[Category:Browse Views]]


Browse views provide a way for visitors to your site to discover relevant content without a specific item in mind (for example, browsing all the content associated with a particular topic). Visitors arriving directly at the page for a specific item in the repository (for example, via a search engine) also use views you have defined to discover related content. 

There are two default views in EPrints - '''By Year''' and '''By Subject'''. This guide describes how to add additional views to your repository. 
Instead with this link you can read a [http://wiki.eprints.org/w/Views.pl complete list of all options] avaible for views.

__TOC__

===The basics===

The views for your repository are defined in the views configuration file:

 /opt/eprints3/archives/ARCHIVEID/cfg/cfg.d/views.pl

Open this file and find the browse_views configuration setting:

 $c->{browse_views} = [
        {
                id => "year",
                fields => "-date;res=year",
                ...
        },
        {
                id => "subjects",
                fields => "subjects",
                ...
        },
 ];

The views are defined using a special (Perl) syntax: the view definition consists of a pair of curly braces (''note the comma after each closing brace'') enclosing a list of property/value pairs (note ''the comma'' after each line).

The key part of the view definition is the '''fields''' property. This names the metadata field (or fields) that EPrints will use to construct the view. For example, for the '''By Year''' view, EPrints groups the records in the repository according to their '''date''' (note that the '''res=year''' suffix tells EPrints to only consider the year part), and constructs a Web page for each date listing the records. Similarly, the '''Browse by Subjects''' view, groups the records according to the ''subjects'' they have been assigned to (a record may appear in more than one group!).

Both the '''Browse by Year''' and '''Browse by Subject''' views are constructed using the values of a single field ('''date''' and '''subjects''' respectively).

It is also possible to construct a view using the ''combined'' values of two or more fields (eg. group records by author '''and''' editor), or even using a sequence of two or more fields (eg. group records by journal title '''and then''' by volume number).

===Worked example: browse by organisational structure===

By default, EPrints has a ''divisions'' metadata field which allows authors to associate their deposits with the divisions (units, faculties, schools, departments, institutes, centres..) that were involved in producing their item (for example, the author's department, and the departments of any co-authors). This worked example allows visitors to browse the repository content by division.

Open the views configuration file:

 /opt/eprints3/archives/ARCHIVEID/cfg/cfg.d/views.pl

Add the following definition to the browse_views setting:

 $c->{browse_views} = [
        {
                id => "year",
                ...
        },
        {
                id => "subjects",
                ...
        },
        {
                id => "divisions",
                fields => "divisions",
                order => "-date/title",
                hideempty => 1,
        },
 ];

Save the file and generate the new view pages (this will also re-generate any existing views defined in the views configuration file):

 bin/generate_views ARCHIVEID --verbose

Open the view page in a Web browser:

 http://your.repository.url/view/

The view page lists all the available views. You should see your new views on the list:

[[Image:View_page2.png|frame|none|The view page lists available views]]

'''Fixing the undefined phrase warning''' The new view may appear on the views page with an ''undefined phrase'' warning (you may also notice a similar warning message when running generate_views):

 ["viewname_eprint_divisions" not defined]

Each view you create needs to be assigned a ''human-readable'' name, which EPrints will use on the view Web pages.

Edit the language-specific phrases file for view names:

 /opt/eprints3/archives/ARCHIVEID/cfg/lang/en/phrases/views.xml

Add an appropriate phrase which describes the new view, for example:

 <epp:phrase id="viewname_eprint_divisions">Division</epp:phrase>

Save the phrases file and regenerate the view pages:

 bin/generate_views ARCHIVEID --verbose

===Example view definitions===

====Browse by type (3.3.8)====

Every deposit in EPrints has a type (article, book, thesis...). To allow visitors to browse your repository content by type, add the following definition to the browse_views setting:

 {
    id=>"doctype", 
    menus => [ 
    { 
      fields => [ "type" ], 
    },], 
    order=>"-date",
 },

====Browse by author====

===Example views (combined fields)===

====Browse by author and editor====

===Example views (multiple fields)===

====Browse by journal title, then by volume====

This example lets visitors browse the journals items in your repository have been published in, and then volumes within each journal.

 {
        id=>"journal_volume",
        fields=>"publication,volume",
        order=>"-date/title",
        hideempty => 1,
 },

[[Image:Browse_by_journal.png|border]]

[[Image:Browse_by_journal_volume.png|border]]



===Linking in your view===

You now need to add a link to your repository pages which takes visitors directly to your new view, or to the views page from where they can access all available views.

[[Image:Browse_by_navbar.png]]

====Generating CVs etc====

===Linking items back to views===
===Views as collections===


===New options in EPrints 3.1===

====subfield no longer supported====

The subfield option is no longer supported in EPrints 3.1.

====new_column_at====

This is an array of integers representing the number of items in a view list before another column is added.  For example:

 [ 10 ]

This would have one column of values until there were 11, then there would be 2 columns.

 [ 10, 10 ]

This would have one column if there were ten or less values, two columns if there were between eleven and twenty (ten + ten) values, and three columns for all other cases.

 [ 0, 0 ]

This would always have three columns.

Add one to the number of integers in the array and you get the maximum number of columns.  The value of each integer defines the point at which that column becomes full, and more values cause an 'overflow' into the next column.

====variations====

This controls the various ways in which a browse view can be subheaded.  It consists of a list of strings.  Each string is the name of a non-compound metadata field (or the keyword DEFAULT, for an unsubheaded list), optionally followed by a semi-colon and a comma separated list of options.  E.G:

 variations => [
  "creators_name;first_letter",
  "type",
  "DEFAULT"
 ],

See [[views.pl]] for the list of options.