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.
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?
- How to build data structure into the
Experttype, 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
Expertlisting 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?