How to only get new data without existing data from a Firebase?

Question

I have a node in Firebase getting continually updated with information from a logfile. The node is lines/ and each child of lines/ is from a

Answer 1

You have the right idea. child_added should be called only for the new nodes. Without source code it's hard to tell why you get all the data in your child_added event.

You can check the chat demo app to see how they load new chat messages. The use case sounds similar.

https://github.com/firebase/firechat/blob/master/src/js/firechat.js#L347