<form novalidate #composeMsgForm="ngForm">
   <div class="form-group">
            <span class="cmpsMsgsub">
              <input name="subject" required maxlength='128' #subject = "ngModel"  [ngModel] = "msgSubject" placeholder="Subject" id='subject' class="subjectInput searchTerm">
            </span>
          </div>
          <div *ngIf="subject.invalid && (subject.dirty || subject.touched)" class="error">
              <div [hidden]="!subject.errors.required">
                  Subject is required!
              </div>
              <div [hidden]="!subject.errors.maxlength">
                  Subject cannot be more than 128 characters long.
              </div>
          </div>
</form>

import { FormsModule } from '@angular/forms';
declare let jQuery: any;
@Component({
  selector: "app-user",
  templateUrl: "./app-user.component.html",
  styleUrls: ["./app-user.component.css"]
})
export class UserComponent implements OnInit, OnDestroy {
}