<li*ngFor="let menuItem of mainMenuItems; let i = index"[ngClass]="{'active-topmenuitem':app.activeTopbarItem ===menuItem,'user-menu':(i===0)}"
<li*ngFor="let menuItem of mainMenuItems; let i = index"[attr.id]="menuItem.id"[ngClass]="{'active-topmenuitem':app.activeTopbarItem ===menuItem,'user-menu':(i===0)}"