Ionic2 navController pop with params (CallBack) - callback

Question

I want to make a callback between two page.
In the page 1, i have this code:
DataInfo= [
{
Price: 0,
ClosePrice: 0,
UpdateTime:"",
DefaultPrice:0
}
]
GetClosePrice(i):number{
return DataInfo[i].ClosePrice;
}
i want to get the value of 'i' from the page 2, How can i load the function GetClosePrice() when the navcontroller return to the page 1 (this.navCtrl.pop())

Answer 1

SOURCE PAGE CLASS
this.navCtrl.push(Page,
{
data: this.data,
callback: this.getData
});
getData = data =>
{
return new Promise((resolve, reject) => {
for (let order of orders) {
this.data = data;
}
resolve();
});
};
TARGET PAGE CLASS
constructor(public navCtrl: NavController, public navParams: NavParams)
{
this.callback = this.navParams.get('callback');
this.data = this.navParams.get('data') || [];
}
sendData(event: any): void
{
this.callback(this.data).then( () => { this.navCtrl.pop() });
}
TARGET PAGE TEMPLATE
<button ion-button (click)="sendData($event)">

Answer 2

I answered similar question in Ionic forum. I just used Events listeners to achieve this behaviour.
MainPage-
import { NavController, Events } from 'ionic-angular';
import { OtherPage } from '../other/other';
export class MainPage{
constructor(private navCtrl: NavController,
private events: Events) { }
private pushOtherPage(){
this.events.subscribe('custom-user-events', (paramsVar) => {
// Do stuff with "paramsVar"
this.events.unsubscribe('custom-user-events'); // unsubscribe this event
})
this.navCtrl.push(OtherPage); // Push your "OtherPage"
}
}
OtherPage-
export class OtherPage {
// Under some function
this.navCtrl.pop().then(() => {
// Trigger custom event and pass data to be send back
this.events.publish('custom-user-events', myCustomParams);
});
}

Answer 3

Try this one - ionic2 pop with params