如何使用Dropdown Angular 2中的列表进行路由

 <select class="form-control" id="category" required [(ngModel)]="model.category" name="category" #category="ngModel">
<option disabled>None</option>
<option> Add New </option>                                
<option *ngFor= "let i of data1"  [value]="i.id">{{i.category}}</option>                                    
 </select>
 <select class="form-control" id="category" req