Im using navigation control in ionic provider whenever i triggered the provider it shows the runtime error Cannot read property 'pop' of null
my code is
@Injectable()
export class ServerResponseProvider {
@ViewChild('myContent') navCtrl: NavController;
constructor(public http: Http, public alertCtrl: AlertController,
protected injector: Injector, private app:App) {
console.log('Hello ServerResponseProvider Provider');
}
httpGetRes(url) {
return Observable.create(observer => {
this.http.get(url)
.map(res => res.json())
.subscribe(data => {
console.log("response:", data);
observer.next(data);
}, (err) => {
console.log("Your error : ", err);
observer.error(err);
if (err.status == 400) {
this.alertC('Validation Error');
} else if (err.status == 403) {
this.alertC('Authorization error')
} else if (err.status == 500) {
this.alertC('Something went wrong try again later')
}
});
});
}
alertC(msg) {
let alert = this.alertCtrl.create({
title: ' OOPS !!!!',
subTitle: msg,
buttons: [{
text: 'ok',
handler: () => {
this.navCtrl.pop();
}
}]
});
alert.present(alert);
}
}
i tried in many ways it wont works thanks in advance
