User:Enterprisey/parent-cats.js

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$( function () {
	mw.loader.using( [ "mediawiki.api", 'mediawiki.util' ], function () {
		var api = new mw.Api();
		var catsOnPage = mw.config.get('wgCategories');
		for(var cat of catsOnPage) {
			// check if any categories on this page are parents of this category
			api.get({formatversion:2, prop:'categories', titles:'Category:' cat})
				.then(function(data){
					var parents=data.query.pages[0].categories.map(c => c.title);
					var actualCat = data.query.pages[0].title.substring('Category:'.length);

					for(var catOnPage of catsOnPage) {
						if(parents.indexOf('Category:' catOnPage) >= 0){
							// tag parent with child
							$('a[href$="Category:'   catOnPage   '"]')
								.css({'background-color':'pink'})
								.text(catOnPage   ' (parent of ' actualCat ')')

							// tag child with parent
							$('a[href$="Category:'   actualCat   '"]')
								.css({'background-color':'pink'})
								.text(actualCat ' (child of ' catOnPage ')')

						}
					}
			});
		}
	});
});