<div *ngFor="let adv of advlist | async">

   <div *ngFor="let da of data">

      <div  *ngIf="da.key == adv.key? ok = false: ok = true">

        <ion-card style="background-color: #a7acaf">
        <ion-card-content>
         <ion-card-title>
              {{da.orgin}}
         </ion-card-title>
        <p>
          {{da.subject}}
        </p>
        <p><b>from</b> : {{da.startDate}} <b>to</b>:  {{da.endDate}}</p>
        </ion-card-content>
         </ion-card>
    </div>

  </div>

<ion-card *ngIf="ok" (click)="openfile(adv)">

   <ion-card-content>
    <ion-card-title>
        {{adv.orgin}}
      </ion-card-title>
    <p>
        {{adv.subject}}
    </p>
    <p><b>from</b> : {{adv.startDate}} <b>to</b>:  {{adv.endDate}}</p>
  </ion-card-content>
</ion-card>

</div>