<div class="form-group" *ngIf="userList.length > 0">
      <label>Users: </label>
      {{userList | json}}
      <tag-input [ngModel)]="selectedUsers"
      secondaryPlaceholder="Searchusers"
      placeholder="Users"
      [onlyFromAutocomplete]="true">
          <tag-input-dropdown  [autocompleteItems]="userList" [showDropdownIfEmpty]="true">
          </tag-input-dropdown>
        </tag-input>
    </div>

userList: any = [];
selectedUsers: Array<any> = [];

getCommunicableUsers(){
this._usersService.getCommunicableUsers().subscribe(res =>{
  this.userList = res.map(function(user) {
    let ob = {  value: user.Id, display: user.Name };
    return ob;
  });
  console.log(this.userList);
})
}