MediaWiki:Common.js

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/** assings congress date information to body tag **/
function setupCalendar() {
  var bodyTag = null;
  try {
    bodyTag = document.getElementsByTagName("body")[0];
    bodyTag.year = 2019;
    bodyTag.month = 12;
    bodyTag.days = [27, 28, 29, 30];
    return bodyTag;
  } catch(e) {
    return null;
  }
}

console.log("setup calendar dates");
var body = setupCalendar();


/* see https://www.mediawiki.org/wiki/Manual:Interface/Sidebar#Advanced_customization */

function ModifySidebar( action, section, name, link ) {
	try {
		switch ( section ) {
			case 'languages':
				var target = 'p-lang';
				break;
			case 'toolbox':
				var target = 'p-tb';
				break;
			case 'navigation':
				var target = 'p-navigation';
				break;
			default:
				var target = 'p-' + section;
				break;
		}

if ( action == 'add' ) {
			var node = document.getElementById( target )
							   .getElementsByTagName( 'div' )[0]
							   .getElementsByTagName( 'ul' )[0];

var aNode = document.createElement( 'a' );
			var liNode = document.createElement( 'li' );

aNode.appendChild( document.createTextNode( name ) );
			aNode.setAttribute( 'href', link );
			liNode.appendChild( aNode );
			liNode.className = 'plainlinks';
			node.appendChild( liNode );
		}

if ( action == 'remove' ) {
			var list = document.getElementById( target )
							   .getElementsByTagName( 'div' )[0]
							   .getElementsByTagName( 'ul' )[0];

var listelements = list.getElementsByTagName( 'li' );

for ( var i = 0; i < listelements.length; i++ ) {
				if (
					listelements[i].getElementsByTagName( 'a' )[0].innerHTML == name ||
					listelements[i].getElementsByTagName( 'a' )[0].href == link
				)
				{
					list.removeChild( listelements[i] );
				}
			}
		}


} catch( e ) {
		// let's just ignore what's happened
		return;
	}
}

function CustomizeModificationsOfSidebar() {
	// adds [[Special:CategoryTree|Special:CategoryTree]] to toolbox
	// ModifySidebar( 'add', 'toolbox', 'CategoryTree', 'http://en.wikipedia.org/wiki/Special:CategoryTree' );
	// ModifySidebar( 'add', 'toolbox', 'Recent changes', 'https://events.ccc.de/congress/2019/wiki/index.php/Special:RecentChanges' );
	// removes [[Special:Upload|Special:Upload]] from toolbox
	ModifySidebar( 'remove', 'toolbox', 'Related changes', 'https://events.ccc.de/congress/2019/wiki/index.php/Special:RecentChangesLinked/Main_Page' );
}

jQuery( CustomizeModificationsOfSidebar );