$( function() {
if ( mw.config.get( 'wgCanonicalSpecialPageName' ) === 'CreateBlogPost' ) { // temp
mw.loader.using( 'jquery.ui.autocomplete', function() { // more temp crap
	$( '#pageCtg' ).autocomplete( {
		minLength: 3,
		source: function( request, response ) {
			$.ajax( {
				type: 'GET',
				dataType: 'json',
				url: mw.util.wikiScript( 'api' ),
				data: {
					action: 'query',
					list: 'allcategories',
					acprefix: request.term,
					format: 'json'
				},
			} ).done( function( data ) {
				response( data.query.allcategories.map( function ( c ) { return c['*']; } ) );
			} ).fail( function() {} );
		},
		select: function( value, data ) {
			if ( typeof data === 'undefined' ) {
				$( '#pageCtg' ).val( value );
			} else {
				$( '#pageCtg' ).val( data.item.value );
			}
		}
	} );
} ); // temp
} // temp
} );

[16:58:07] <rlot> MatmaRex: Hmm, is there way to directly create CapsuleMultiselectWidget in PHP?
[16:58:21] <rlot> new OOUI\CapsuleMultiSelectWidget();
[17:00:43] <MatmaRex> rlot: no. there's a task for it somewhere
[17:01:21] <MatmaRex> rlot: it's impossible to implement it without any JS, though. so i'm not really sure what that would do, myself
[17:01:53] <rlot> MatmaRex: Hmm, what if I want to add this widget to my specialpage?
[17:02:12] <rlot> I need to append it via JS script to output?
[17:02:26] <rlot> Or in some holder
[17:07:28] <MatmaRex> rlot_: yeah :/
[17:07:54] <MatmaRex> rlot_: if you're using HTMLForm, it was some fallback to a list of checkboxes. (or you could implement something like that yourself)
[17:07:58] <MatmaRex> it has*
[17:10:23] <rlot_> MatmaRex: Hmm. Is there any better widget for autocompletion/adding tags/etc?
[17:11:31] <SamanthaNguyen> MatmaRex: If you're interested, the tickets directly related to rlot's questions are T146000 and T154855 (you might already be aware of that, though)
[17:11:31] <stashbot> T146000: FeatureRequest: BlogPage's Special:CreateBlogPost should have autocompletion for adding categories - https://phabricator.wikimedia.org/T146000
[17:11:32] <stashbot> T154855: Impossible to remove a category after adding one with the social tools TagCloud function (e.g in Special:CreateBlogPost) - https://phabricator.wikimedia.org/T154855