Setting Firebase data to property in html file - firebase

Question

Okay so i am fairly new at ionic and i am experiencing this problem where by i am getting the users data from firebase but whenever i set it to the public variable and try and reference it in the html file, i am getting a log error of "cannot set 'variable name' to property of undefined". Here is my code for a more clearer explanation and understanding of what i am trying to achieve. Thank you.
.ts file:
import { Component } from '#angular/core';
import { IonicPage, NavController, NavParams,AlertController,
LoadingController, Loading } from 'ionic-angular';
import {AngularFireAuth} from 'angularfire2/auth';
import { MenuPage } from '../menu/menu';
import firebase from 'firebase';
import { first } from 'rxjs/operators';
#IonicPage()
#Component({
selector: 'page-account',
templateUrl: 'account.html',
})
export class AccountPage {
public userinfo;
constructor(public navCtrl: NavController, public navParams: NavParams,
private alertCtrl:AlertController, public fAuth:AngularFireAuth,
public loading:LoadingController) {
}
ionViewDidLoad() {
console.log('ionViewDidLoad AccountPage');
this.readData();
}
isLoggedIn(){
return this.fAuth.authState.pipe(first()).toPromise();
}
userStatus(){
const user = this.isLoggedIn()
if(user){
console.log('logged in');
this.readData();
}else{
}
}
async readData(){
let load = this.loading.create({
content: "Setting up your profile...",
spinner:'dots'
});
load.present();
await this.fAuth.authState.subscribe((user:firebase.User) =>{
if(user){
firebase.database().ref('/users/' +
user.uid).once('value').then(function(snapshot){
if(snapshot.exists()){
var data = (snapshot.val() && snapshot.val().username) ||
'Anonymous';
//this.userinfo = data;
console.log(data);
}else{
console.log("i need a name");
}});
}else{
console.log("not logged in, log in please");
this.alertLogin();
};
});
console.log(this.userinfo );
load.dismiss();
}
getName(){
let alert = this.alertCtrl.create({
title: 'Hello new friend! :) please can you tell us your name...',
inputs: [
{
name: 'name',
placeholder: 'name'
}
],
buttons: [
{
text: 'Cancel',
role: 'cancel',
handler: data => {
console.log('Cancel clicked');
this.navCtrl.setRoot(MenuPage);
}
},
{
text: 'Confirm',
handler: data => {
this.fAuth.authState.subscribe((user:firebase.User) =>{
firebase.database().ref('/users/' + user.uid).set({
username:data.name
});
});
}
}
]
});
alert.present();
}
alertLogin(){
//if user is not already logged in
let alert = this.alertCtrl.create({
title: 'Whoa there Sally! you need to log in first! :)',
inputs: [
{
name: 'email',
placeholder: 'email'
},
{
name: 'password',
placeholder: 'Password',
type: 'password'
}
],
buttons: [
{
text: 'Cancel',
role: 'cancel',
handler: data => {
console.log('Cancel clicked');
this.navCtrl.setRoot(MenuPage);
}
},
{
text: 'Login',
handler: data => {
this.login(data.email,data.password);
}
},{
text: 'Register',
handler: data => {
this.register(data.email,data.password);
}
}
]
});
alert.present();
}
async login(email,password){
try{
var login = await this.fAuth.auth.signInWithEmailAndPassword(
email,
password
);
if(login){
console.log("Successfully logged in!");
}
}catch(err){
console.error(err);
alert("Sorry we couldnt find you in our system :(");
this.navCtrl.setRoot(MenuPage);
}
}
async register(email,password){
try{
var reg = await this.fAuth.auth.createUserWithEmailAndPassword(
email,
password
);
if(reg){
this.getName();
console.log("successfully registered!");
this.navCtrl.setRoot(AccountPage);
}
}catch(err){
console.error(err);
}
}
logout(){
this.fAuth.auth.signOut();
}
}
.html file:
<ion-item>
<h1>{{userinfo}}</h1>
</ion-item>

Answer 1

Okay so i have tried basically everything and have decided to rather just upload the name to the database and write it locally in the storage of the application. I will just pull the name, along with further details later on in the application process. However if anyone finds an answer for this post, i would greatly appreciate it!