# Ionic 4 - ion-list adding filter to async

**URL:** <https://forum.ionicframework.com/t/ionic-4-ion-list-adding-filter-to-async/165422>\
**Category:** ionic-v3\
**Created:** [June 3, 2019, 6:33pm UTC](https://forum.ionicframework.com/t/ionic-4-ion-list-adding-filter-to-async/165422 "2019-06-03T18:33:16Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![JohnCressman](https://avatars.discourse-cdn.com/v4/letter/j/c68b51/32.png) [@JohnCressman](https://forum.ionicframework.com/u/JohnCressman)\
**Post date:** [June 3, 2019, 6:33pm UTC](https://forum.ionicframework.com/t/ionic-4-ion-list-adding-filter-to-async/165422/1 "2019-06-03T18:33:16Z")

</div>

Is is possible to add filter to an ion-list that is using async?

I see example of using filter, but never with async. when i try, I get an error saying Unresolved Pipe filter

```auto
  <ion-searchbar placeholder="Search by Name" (ngModel)="searchTerm"></ion-searchbar>
  <ion-list *ngIf="results">
    <ion-item button *ngFor="let item of (results | async | filter:searchTerm)" routerDirection="forward" [routerLink]="['/hospital-details/'+ item.id]">
      <ion-label text-wrap>
        <h3>{{ item.name }}</h3>
      </ion-label>
    </ion-item>
  </ion-list>

```

But I see examples that are working:

```auto
   <ion-list>
      <ion-item type="item-text-wrap" href="#/tab/friend/{{friend.id}}"
        ng-repeat="friend in friends | filter:search | limitTo:listlength">
        {{friend.name}}
      </ion-item>
    </ion-list>

```