how to get firebase database nested data access inside unique key

Question

In firebase I want to access database written as below.

<script>
function fnReadMails(){
  var user = firebase.auth().currentUser;
  var ref = firebase.database().ref('/posts/'+user.uid);
  ref.on("value", function(snapshot) {
    var vardata = (snapshot.val());
    console.log(vardata);
  });
}
</script>

The problem is that string marked in red is unique push key randomly generated. Whenever I am getting a reference I am able to take ref up to one level upper i.e. userid , but I want to access data inside that key which I don't know as it will be generated for next post automatically.

How to access nested data inside key?

@Dravidian javascript

Ravindra Gupta
– Ravindra Gupta

2016-09-11 08:35:37 +00:00
Commented Sep 11, 2016 at 8:35 — Ravindra Gupta
– Ravindra Gupta, Commented Sep 11, 2016 at 8:35

Frank van Puffelen · Accepted Answer · 2016-09-11 14:26:01Z

2

As an alternative to Callam's answer, you can also keep using the value event. But in that case you must loop over the messages with forEach():

ref.on("value", function(snapshot) {
  snapshot.forEach(function(messageSnapshot) {
    console.log(messageSnapshot.val());
  }
});

Both approaches (using value vs using child_*) result in the same network traffic. But using value is often easier to get started with, while using child_ events makes it easier to update the specific UI element that needs to be updated.

answered Sep 11, 2016 at 14:26

Frank van Puffelen

603k85 gold badges895 silver badges869 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Ravindra Gupta Over a year ago

Thanks @Frank van Puffelen; it worked for me but how to store value of nos. of records.

Amit0191 Over a year ago

Has the on function deprecated? It cannot resolve symbol on for me.

Callam · Accepted Answer · 2016-09-11 10:14:14Z

2

You want the child_added event type, this will log the snapshot of every child under your ref.

ref.on("child_added", function(snapshot) {
    console.log(snapshot);
});

answered Sep 11, 2016 at 10:14

Callam

11.5k2 gold badges36 silver badges33 bronze badges

Collectives™ on Stack Overflow

how to get firebase database nested data access inside unique key

2 Answers 2

2 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related