Ionic2 NativeStorage can't getItem(user) - ionic2

Question

I have an ionic 2 app and am using native FB Login to retrieve name/pic and saving it to NativeStorage. The flow is that I open WelcomePage, log in, and save the data. From there, navPush to HomePage. So far it works great.
However, I have a ProfilePage (accessible via tabRoot), the fails. The reason is that in my profile.html I have the following tag that should render Username (this works on HomePage, but not on ProfilePage):
{{ user.name }}
The error I get on XCode is:
2017-05-02 18:40:41.657374 FoxBox App[1102:226159] ERROR: Failed to navigate: undefined is not an object (evaluating 'co.user.picture')
Note that for some reason it prepends it with 'co.' which I have no idea where its coming from or what it means.
Here is the WelcomePage code:
import { Component } from '#angular/core';
import { NavController } from 'ionic-angular';
import { HomePage } from '../home/home';
import { AboutPage } from '../about/about';
import { Facebook, NativeStorage } from 'ionic-native';
//import { FacebookAuth, User, Auth } from '#ionic/cloud-angular';
import { CloudSettings, CloudModule } from '#ionic/cloud-angular';
import {GoogleAnalytics} from 'ionic-native';
#Component({
selector: 'page-welcome',
templateUrl: 'welcome.html'
})
export class WelcomePage {
FB_APP_ID: number = 1234567890;
homePage = HomePage;
aboutPage = AboutPage;
constructor(
public navCtrl: NavController,
//public facebookAuth: FacebookAuth,
//public auth: Auth,
//public user: User,
) {
Facebook.browserInit(this.FB_APP_ID, "v2.8");
}
doFbLogin(){
//alert("fb is logged in");
let permissions = new Array();
let nav = this.navCtrl;
//the permissions your facebook app needs from the user
permissions = ["public_profile"];
Facebook.login(permissions)
.then(function(response){
let userId = response.authResponse.userID;
let params = new Array();
//Getting name and gender properties
Facebook.api("/me?fields=name,gender", params)
.then(function(user) {
user.picture = "https://graph.facebook.com/" + userId + "/picture?type=large";
//now we have the users info, let's save it in the NativeStorage
NativeStorage.setItem('user',
{
name: user.name,
gender: user.gender,
picture: user.picture,
email: user.email,
})
.then(function(){
nav.push(HomePage);
console.log("User Data Stored");
}, function (error) {
console.log(error);
})
})
}, function(error){
console.log(error);
});
}
}
Here is the HomePage code:
import { Component } from '#angular/core';
import { NavController, Platform } from 'ionic-angular';
import { Http } from '#angular/http';
import 'rxjs/add/operator/map';
import { ClaimPage } from '../claim/claim';
import { SocialSharing } from '#ionic-native/social-sharing';
import { Facebook, NativeStorage } from 'ionic-native';
//import { FacebookAuth, User, Auth } from '#ionic/cloud-angular';
import { CloudSettings, CloudModule } from '#ionic/cloud-angular';
import {GoogleAnalytics} from 'ionic-native';
#Component({
selector: 'page-home',
templateUrl: 'home.html'
})
export class HomePage {
posts: any;
sendme: any;
claimPage = ClaimPage;
user: any;
userReady: boolean = false;
constructor(
public navCtrl: NavController,
public http: Http,
private sharingVar: SocialSharing,
public platform: Platform,
) {
// Check to see if user already exists (via FB login)
let env = this;
NativeStorage.getItem('user')
.then(function (data){
env.user = {
name: data.name,
gender: data.gender,
picture: data.picture
};
env.userReady = true;
// console.log(data.name);
}, function(error){
console.log(error);
});
this.platform.ready().then(() => {
//alert("platform is ready");
GoogleAnalytics.trackView("Home-Page", "http://foxboxapp.com/home", true);
//alert("GA called");
});
this.http.get('http://getyourtryston.com/foox/sample.php').map(res => res.json()).subscribe(data => {
this.posts = data.data.children;
});
}
otherShare(){
this.sharingVar.share("FoxBox App","Get Awesome College Deals",null/*File*/,"http://fooxsocial.com")
.then(()=>{
//alert("Success");
},
()=>{
alert("Sharing Failed!")
})
}
}
And here is the ProfilePage code which fails:
import { Component } from '#angular/core';
import { NavController, Platform } from 'ionic-angular';
import { WelcomePage } from '../welcome/welcome';
import {GoogleAnalytics} from 'ionic-native';
import { SocialSharing } from '#ionic-native/social-sharing';
import { Facebook, NativeStorage } from 'ionic-native';
//import { FacebookAuth, User, Auth } from '#ionic/cloud-angular';
//import { CloudSettings, CloudModule } from '#ionic/cloud-angular';
#Component({
selector: 'page-about',
templateUrl: 'about.html'
})
export class AboutPage {
user: any;
userReady: boolean = false;
constructor(
public navCtrl: NavController,
public platform: Platform,
private sharingVar: SocialSharing,
//public facebookAuth:FacebookAuth,
//public auth:Auth,
) {
// Check to see if user already exists (via FB login)
let env = this;
NativeStorage.getItem('user')
.then(function (data){
env.user = {
name: data.name,
gender: data.gender,
picture: data.picture
};
env.userReady = true;
// console.log(data.name);
}, function(error){
console.log(error);
});
// PLATFORM READY, do your thang!
this.platform.ready().then(() => {
// Ping Google Analytics
GoogleAnalytics.trackView("Profile Page", "http://foxboxapp.com/home", true);
});
}
otherShare(){
this.sharingVar.share("FOOX Social App","Get Awesome College Deals",null/*File*/,"http://fooxsocial.com")
.then(()=>{
//alert("Success");
},
()=>{
alert("Sharing Failed!")
})
}
doFbLogout(){
var nav = this.navCtrl;
Facebook.logout()
.then(function(response) {
//user logged out so we will remove him from the NativeStorage
NativeStorage.remove('user');
nav.push(WelcomePage);
}, function(error){
console.log(error);
});
}
}
And here is ProfilePage.html
<ion-header>
<ion-navbar color="light" hideBackButton="true">
<ion-buttons end>
<button ion-button icon-only (click)="otherShare()">
<ion-icon name="share"></ion-icon>
</button>
</ion-buttons>
</ion-navbar>
</ion-header>
<ion-content>
<ion-card class="pCard">
<div class="pHeader" align="center">
<div *ngIf="user" class="pImgBox" align="center">
<img class="pImage" src="{{ user.picture }}">
</div>
<div class="pUsername" align="center">
<div *ngIf="user"> {{user.name}} </div>
<br>
<span class="pSchool">(Santa Monica College)</span>
</div>
</div>
<ion-list>
<ion-item class="pItems">
Share App
</ion-item>
<ion-item class="pItems">
Give Us Feedback
</ion-item>
<ion-item class="pItems">
Suggest Vendors
</ion-item>
<ion-item class="pItems">
Privacy & Terms of Service
</ion-item>
<ion-item class="pItems">
Log Out
</ion-item>
<ion-item class="pItems">
Delete Account
</ion-item>
</ion-list>
</ion-card>
<button ion-button round (click)="doFbLogout()">Log Out</button>
</ion-content>
I should mention that, if I remove {{ user.name }} and {{ user.picture }} from my ProfilePage.html, there does NOT seem to be any problems. In fact, if you notice in the ts of ProfilePage, I can both Alert and Console.log the username (data.name) without any issues.
I'm a beginner and would appreciate any concise help in this regard. Thank you.

Answer 1

I finally found a solution. In the html file (ProfilePage.html), I used an *ngIf conditional:
<div *ngIf="user"> {{user.name}} </div>
This will introduce a delay such that the 'user' object is no longer null as it reads from NativeStorage.
Alternatively, an Elvis Operator also works for me:
<div> {{ user?.name }} </div>