Functions didn't work correctly when i use Push() method

Ionic Framework ionic-v3
1

In my ionic project i used expandable card view in two pages.The problem is when i go to one page and click the card it work correctly. then i go to second page and click the card ,it didn’t work(but the function is calling correctly) when i use setRoot() method to go to next page it work clearly.but when i use push() method it didn’t work.

 html:

 <ion-card *ngFor= "let item of objectData;let k=index;" style="border: 2px solid #9D9D9D;border-radius: 10px;">
   
 <ion-card-content (click)="showmore(k,item.carrierFsCode,item.arrivalAirportFsCode,item.departureAirportFsCode,item.flightId);" id="{{k}}" style="display: block">
    </ion-card-content>
.................
..............
............

    <ion-card-content  class="panel" id="{{k}}second" style="display: none" (click)="showless(k);">
..............
.................
.........

    </ion-card-content>
  </ion-card>

ts code:

showmore(k,flightcode,arrivalairportcode,departureairportcode,flightid)
  {
    document.getElementById(k).style.display = 'none';
    document.getElementById(k+"second").style.display = 'block';
    this.getAirlileName(flightcode);
    this.getArrivalAirportCiy(arrivalairportcode);
    this.getDepartureAirportCiy(departureairportcode);
    this.getDataFromStorage(flightid);


  }
  showless(k)
  {
    document.getElementById(k+"second").style.display = 'none';
    document.getElementById(k).style.display = 'block';
  }

the problem become when i use this
this.navCtrl.push(DeparturePage) .

but when i use this.navCtrl.setRoot(DeparturePage) like this it work correctly