Using OCCategories

This 'class' is meant for any apps that uses OC_VObjects with the CATEGORIES field e.g.
Contacts and Calendar. It provides an editor UI for adding/deleting and rescanning categories
and basic ajax functions for adding and deleting.
To use the mass updating of OC_VObjects that /lib/vcategories.php provides, the app must implement
its own ajax functions in /apps/$(APP)/ajax/categories/rescan.php and /apps/$(APP)/ajax/categories/delete.php
See examples in /apps/contacts/ajax/categories and the inline docs in /lib/vcategories.php.

In your app make sure you load the script and stylesheet:

OC_Util::addScript('','oc-vcategories');
OC_Util::addStyle('','oc-vcategories');

Set the app specific values in your javascript file. This is what I've used for the Contacts app:

	OCCategories.app = 'contacts';
	OCCategories.changed = Contacts.UI.Card.categoriesChanged;

If OCCategories.changed point is set that function will be called each time the categories have been changed
in the editor (add/delete/rescan) to allow the app to update the UI accordingly. The only argument to the function
is an array of the updated categories e.g.:

OCCategories.changed = function(categories) {
	for(var category in categories) {
		console.log(categories[category]);
	}
}