<ul role='List' [ngClass]='listClasses'>
   <li
     role='Listitem'
     (click)='selectItem(item)'
     *ngFor='let item of listItems; let i = index'
     [class.selected]='i === activeIndex'
     [selected]='i === activeIndex'>{{i + 1}}: {{item.data}}
   </li>
 </ul>