Ionic2 selcted value undefined - ionic2

Question

Hi I have a select box in ionic 2 as.
//home.html
<ion-item>
<ion-label>Select City</ion-label>
<ion-select [(ngModel)]="city" (ionChange) ="getDoors()">
<ion-option *ngFor="let city of cities" [value]="city.id">
{{city.name}}</ion-option>
</ion-select>
</ion-item>
//home.ts
getDoors(){
console.log(this.cities);
}
But when I am changing option it throw an error, Error trying to diff '1'
can anyone let me know the issue here
Thanks advance

Answer 1

There are 2 methods through which you can get the value of the selected Item.
Method 1
//home.html
<ion-item>
<ion-label>Select City</ion-label>
<ion-select [(ngModel)]="city" (ionChange) ="getDoors($event)">
<ion-option *ngFor="let city of cities" [value]="city.id">
{{city.name}}</ion-option>
</ion-select>
</ion-item>
//home.ts
getDoors($event){
console.log($event);
}
Method 2
By using ngModel
//home.html
<ion-item>
<ion-label>Select City</ion-label>
<ion-select [(ngModel)]="selectedcity" (ionChange) ="getDoors($event)">
<ion-option *ngFor="let city of cities" [value]="city.id">
{{city.name}}</ion-option>
</ion-select>
</ion-item>
//home.ts
selectedcity: city
getSelectedCity(){
return this.selectedcity;
}

Answer 2

Perhaps it's because you named your ngModel city and your *ngFor uses city as well. Might cause a conflict. I would change your ngModel to
[(ngModel)]="selectedCity"