embedded PDF viewer

[ebenenglish]

When I am on the show page for an item And the primary file for the item is a PDF I should see an embedded PDF viewer application that allows me to search within and read the content So that I can view the content without having to download the PDF file

Investigate using PDF.js for this.

Example item with PDF as primary file:

https://www.digitalcommonwealth.org/search/commonwealth:r494vt25n

Direct URL for PDF file:

https://bpldcassets.blob.core.windows.net/derivatives/documents/commonwealth:r494vt26x/document_access.pdf

First tasks:

• determine what JS libraries/files need to be added to the codebase
• the JS function call to render the viewer with the desired features

[ebenenglish]

Example embedded PDF viewer:

• https://newspapers.lib.utah.edu/details?id=21200010

[ebenenglish]

Another example, looks to be using PDF.js: https://digitalcommons.framingham.edu/uncategorized/IO_a753cd78-e951-45e7-bfea-698dd0162c2b/

Here's an example using the Universal Viewer, though this PDF doesn't seem to be searchable so maybe not a good comparison: https://www.chicopeepubliclibrary.org/archives/items/show/3671

[ebenenglish]

Another example, looks like PDF.js in an iframe: https://ptsongasuml.omeka.net/items/show/11439

[ebenenglish]

Also PDF.js inside iframe: https://openarchives.umb.edu/digital/collection/p15774coll11/id/97

[ebenenglish]

Fixed via #121