下拉验证，没有在角度的表单标签

Question

验证必填字段的下拉列表，而在角度2、4、5、6中没有任何表单标签。您能提供解决方法吗？

我尝试使用ng-model

<span style="color:red" *ngIf="!selectedCountry">
                 Mandatory Field
            </span>

<div class="some class">
          <div class=some class" [class.active]="dropdown.open"
            (clickOutside)="dropdown.open = false">
            <div class="some class" (click)="toggleDropdown(dropdown.open)">
              <label>Select Country 
              Name</label>

              <input class="font-sz-14" type="text" id="select-country"
               [(ngModel)]="selectedCountry" placeholder="" required >               
            </div>
            <div class="dropdown__menu">
                <div class="country-list">
                <a *ngFor="let country of countries;let i = index;"
                    (click)="selectCountry(country.countryId,country.countryName,countryDropdown)">{{country.countryName}}</a>
                    </div>

            </div>
          </div>
        </div>

应用快速响应