ngshow

<div ng-show="myVar">stuff</div>

<div class="dropdown">
    <button class="btn btn-default" (click)="manualtoggle()"  id="dropdownMenu1" >
    Seleccione una Ubicación
    <span class="caret"></span>
    </button>
    <ul class="dropdown-menu" [ngStyle]="{display:displayddl}">
        <li *ngFor="let object of Array" (click)="selectLocation(location)">{{object.Value}}</li>                                
     </ul>
 </div>