<button (click)="_toggleSidebar()" class="demo-header__toggle"></button>
        <span class="ingtext hand" routerLink="/home">Angular 2 component library</span>
           <div class="user dropdown" dropdown  >
            <img src="/images/User.png" dropdown-open alt="" style="cursor: pointer"/>
            <div class="dropdown-menu dropdown-menu-right" >
        <button class="dropdown-item">{{username}}</button>
        <button class="dropdown-item" (click)=" onLogout()">Logout</button>
       
      </div>
           
        </div>