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In the UNU website under the Experts section (http://unu.edu/experts) there's a form where you can filter the experts by their institute and expertise area.

This is what it looks like: enter image description here

I understand that the experts are stored in custom post types "expert". But I don't understand how the search form is built so that users can filter experts by selecting their institution and research topics?

Specifically:

  • How to build data structure into the Expert type, i.e. how to link an expert with attributes like "institution" and "research area"?
  • With the above data structure built, how to include a filter for Expert listing as shown in the screenshot above?

I would appreciate if you could explain the general idea how it's implemented; or is there a plugin so I don't have to reinvent?

Thank you.

  • Thank you @Trix for your comment. I revised the question a bit and I hope it's clearer. – John Doe Dec 21 '15 at 5:41
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How to build data structure into the Expert type, i.e. how to link an expert with attributes like "institution" and "research area"?

Answer
You may use Taxomonies in wordpress, to add extra level od categorization of your posts. In your example, you may register Institution and Research area taxonomies for your Experts custom post type.

With the above data structure built, how to include a filter for Expert listing as shown in the screenshot above?

Answer
You may use an ajax call to pass the filter criteria and receive related experts from the server.

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