Angular 6 dropdown menu example

Example 1: angular material dropdown menu

<mat-menu #animals="matMenu">
  <button mat-menu-item [matMenuTriggerFor]="vertebrates">Vertebrates</button>
  <button mat-menu-item [matMenuTriggerFor]="invertebrates">Invertebrates</button>
</mat-menu>

<mat-menu #vertebrates="matMenu">
  <button mat-menu-item [matMenuTriggerFor]="fish">Fishes</button>
  <button mat-menu-item [matMenuTriggerFor]="amphibians">Amphibians</button>
  <button mat-menu-item [matMenuTriggerFor]="reptiles">Reptiles</button>
  <button mat-menu-item>Birds</button>
  <button mat-menu-item>Mammals</button>
</mat-menu>

Example 2: angularjs dropdown

<select ng-options="v.name for v in variants | filter:{type:2}" ng-change="calculateServicesSubTotal(item)"
ng-model="item.selectedVariant" ng-show="item.id==8" name="posterVariants"
ng-required="item.id==8 && item.quantity > 0" class="ng-pristine ng-valid ng-valid-required">
    <option value="?" selected="selected"></option>
    <option value="0">set of 6 traits</option>
    <option value="1">5 complete sets</option>
</select>