I have a form in which i used ngx-select-dropdown with angular7. In my form select option is required. I want to validate it on form submitting. But my validate methods are not working with ngx-select-dropdown library, and in documentation of ngx-select-dropdown i could not found any helping information about validation. Is it possible to validate it ?
<ngx-select-dropdown (change)="onSelectDropdown($event)" name="unit" [config]="config"
[ngClass]="{ 'is-invalid': f.submitted && !unit.valid }"
[options]="unitsList"
[(ngModel)]="createUser.unit" id="unit" #unit="ngModel" required>
</ngx-select-dropdown>
<div *ngIf="f.submitted && !unit.valid" class="invalid-feedback">Unit is required</div>
