Angular 4 Firebase Read data from database and display to browser

Question

I am learning Angular 4, and I am using firebase database. But I am completely lost on how I can make the objects appear in the browser of my application. I currently want to take all the data from users and display it on the browser.

import { Component, OnInit } from '@angular/core';
import { AngularFireDatabase, FirebaseListObservable } from 'angularfire2/database';
import * as firebase from 'firebase/app';

@Component({
  selector: 'app-about',
  templateUrl: './about.component.html',
  styleUrls: ['./about.component.css']
})
export class AboutComponent implements OnInit {
  
  constructor() {
    var allUsers = firebase.database().ref('users/');
      var db = firebase.database().ref('/users/');
      // Attach an asynchronous callback to read the data at our posts reference
        db.on("value", function(snapshot) {
          console.log(snapshot.val());
        }, function (errorObject) {
          console.log("The read failed: " + errorObject.code);
        });
          }

  ngOnInit() {
  }

}

Everything works fine, and I can see my data on the console. But can you help me with how I can make the data on the console appear on the browser??

Answer 1

Well there is no need to use console.log() if you want to display data on Browser.Angularfire has its own functions for this. This link focus exactly on your problem

Here is an example that takes all the users name from a database and displays them as a list

import { Component, OnInit } from '@angular/core';
import { AngularFireDatabase, FirebaseListObservable,FirebaseObjectObservable } from 'angularfire2/database';
import * as firebase from 'firebase/app';

@Component({
  selector: 'app-about',
  templateUrl: './about.component.html',
  styleUrls: ['./about.component.css']
})
export class AboutComponent implements OnInit {

    users:FirebaseListObservable<any>;;
    constructor(db2: AngularFireDatabase) {
    this.users = db2.list('users');
          }
  ngOnInit() {
  }

And the following Html code

<div class="container">
  <p>Show all users</p>
  <ul>
  <li *ngFor="let user of users | async">
       {{ user.name | json }}
    </li>
  </ul>
</div>

Hope it reduced your confusion on the matter.If you didnt understant something plz ask me again