Newspaper Issues Calendar View

[amym-li]

This PR installs the fullcalendar_solr module and provides a calendar view for newspaper collections.

It includes:

• A year calendar view configured with Advanced Search and Facet blocks. The year calendar highlights dates containing newspaper issues for the specified year. When a highlighted date is clicked, it opens a tab to the day view and preserves the search keys and facets.

• A day view configured with Advanced Search and Facet blocks. The day view displays newspaper issues for a specified date. (Modelled after the Solr search content view)
• A block that generates a link to the calendar view, added to the Newspapers display context. It sets the calendar year to the oldest year with results but this can be modified by editing the sort criteria for the Calendar Link block.

[rosiel]

Once we add this (this pr's ok, i'll make a follow-up) we can remove views nested details, right?

[rosiel]

Accessibility testing?

[rosiel]

1 - my test with voiceover found it impossible to access the individual days, unless you tab across each date, and even in that case, the coloured highlighting is inaudible.

There are more tweaks i'd propose - including making this the default newspaper view or available in an alternate rendering while keeping the same breadcrumbs - but the accessibility piece is the big one.

[amym-li]

An update on the accessibility issues, I've updated the PR to use the latest release of the FullCalendar Solr module.

This version has improved accessibility:

• Only highlighted dates are tabbable
• Highlighted dates have more descriptive aria labels

Accessibility testing was done using WebAIM WAVE and Axe DevTools.

In addition to the accessibility improvements, there is an added option to link to the item if the date has only one result.

[rosiel]

Great. I noticed you're using the Date Created field. In the other newspaper view, we use Date Issued (which is also what the sample content has).

[amym-li]

The calendar view now uses the Date Issued field instead of Date Created.
Also, the day view takes the date as a contextual filter so I had to add the Date Issued field to the Search API Index.

[amym-li]

I updated the Calendar Link block to redirect to the latest year with results. Also, enabled the option to link directly to the issue if a date has only one result.

[amym-li]

An update on breadcrumbs:

The Newspaper node can be added to the breadcrumbs on the Calendar View by enabling the Include the current node in the breadcrumbs? option. However, this will affect how all other breadcrumbs are displayed as well.

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When disabled:

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When enabled: