Firebase SDK javascript read examples

senel-bbs-firebase-read.js

var channel = {}


// https://firebase.google.com/docs/reference/js/firebase.database.Reference
// A Reference represents a specific location in your Database and can be used for reading or writing data to that Database location.
// Get a reference to the database service
var database = firebase.database(); 

//Get a reference to the channels node
var channelsRef = database.ref('/channels');


//Handle a new value:
channelsRef.on('value', function(dataSnapshot) {
  console.log('Something changed on channels node');
});

//Handle a new child:
channelsRef.on('child_added', function(childSnapshot, prevChildKey) {
  console.log('New child added on channels node');
});

//Handle child removal:
channelsRef.on('child_removed', function(oldChildSnapshot) {
  console.log('Child removed on channels node');
});

//Handle child data changes:
channelsRef.on('child_changed', function(childSnapshot, prevChildKey) {
  console.log('Child data changed on channels node');
});

//Handle child ordering changes:
channelsRef.on('child_moved', function(childSnapshot, prevChildKey) {
  console.log('Child node ordering changed on channels node');
});



//Value events synchronize the entire value
channelsRef.on('value', logChannels);

function logChannels (snapshot) {
  console.log('Data changed on channels node', snapshot.val());
}