Form into ngFor

Ionic Framework ionic-v3
7

I also have the same problem while i am using ngfor under i have one ion-input when i enter amount in ion-input that time it will take same for all other field

<ion-card id=“maincard” padding *ngFor=“let item of bating;let i=index” [(ngModel)]=“selectedvalue” [hidden]=“maincard”>

  <ion-col>  
    <ion-input style="width: 75px;" type="number"  attr.id="add{{i}}" placeholder="1234{{i}}" [(ngModel)]="bidAmount" class="amount"  ng-model="amount" required></ion-input>
    
  </ion-col>
    <button ion-button small outline  (click)="btn_betting_wetten(item.bet_id,item.topic_id,'top')" type="submit" disabled={{btnWetten}} ng-disabled="amount.$invalid"> Wetten {{i}}</button>


</ion-row>