[wp-trac] [WordPress Trac] #14877: Ability to create exclusive custom taxonomies

[WordPress Trac]

#14877: Ability to create exclusive custom taxonomies
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 Reporter:  benbalter        |       Owner:  nacin
     Type:  feature request  |      Status:  reviewing
 Priority:  normal           |   Milestone:  Future Release
Component:  Taxonomy         |     Version:
 Severity:  minor            |  Resolution:
 Keywords:                   |
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Comment (by nacin):

 #16708 marked as a duplicate.

 Here's what I'm planning here. Basically, a taxonomy will be able to
 choose from a series of meta boxes.

  - checkboxes (currently used for hierarchical taxonomies)
  - input box (currently used for non-hierarchical taxonomies)
  - radio buttons, based on the current checkbox meta box (exclusive)
  - radio buttons, based on the current post format meta box (exclusive)
  - a dropdown (exclusive)

 There are possibly others, especially hybrids (like the current non-
 hierarchical taxonomy box, only with a dropdown, like the current Trac
 keywords box). Also possibly one other that escapes me, but I think I got
 the main ones covered. I'm not even covering sortable term orders here,
 which is a whole other idea.

 Exclusive taxonomies (where you can enforce only one term being selected)
 will be enforced server-side. The post format stuff will be entirely
 abstracted into one of these meta boxes as well as the save handler.

 This will also allow us to adopt a flag to turn off the popular terms
 support, particularly the functionality in #3130, making the existing
 hierarchical taxonomy box far more flexible. There will also be a flag,
 where appropriate, for the option to choose no term, in the case of
 exclusive taxonomies (otherwise you couldn't de-select the choice). There
 can also be a flag for the ability to add new terms (possibly based on
 permissions), the tag cloud as appropriate, etc etc.

 I think this is also a perfect time to finally create a basic WP_Meta_Box
 class.

 This (as well as the class) is something I'm willing to shepherd for 3.2.
 Support it during the scope sessions if you like it.

 The ideas here have been bounced around a bit among other members of the
 core team (at Tybee), but I'd like to see where else this can go to grow a
 new API.

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Ticket URL: <http://core.trac.wordpress.org/ticket/14877#comment:7>
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