How to retrieve data from Firebase Database?

Question

I\'m trying to create a simple program that takes name, mobile number and email address from user and then puts the data on Firebase Realtime Database.

There are 3 i

Answer 1

The answer to this question is buried deep within Firebase Database Reference. forEach() is used to get to the child without knowing the child's exact path.

var leadsRef = database.ref('leads');
leadsRef.on('value', function(snapshot) {
    snapshot.forEach(function(childSnapshot) {
      var childData = childSnapshot.val();
    });
});

Now childSnapshot will contain the required data, the same thing can also be accessed using child_added.

leadsRef.on('child_added', function(snapshot) {
      //Do something with the data
});

The only difference is that in case of forEach(), it will loop through from the start so if any new data will be added, it will also load the previous data but in case of child_added, the listener is only on new child and not the previous existing childs.