• firebase.
• database.
• Database

The client automatically maintains a persistent connection to the Database server, which will remain active indefinitely and reconnect when disconnected. However, the goOffline() and goOnline() methods may be used to control the client connection in cases where a persistent connection is undesirable.

While offline, the client will no longer receive data updates from the Database. However, all Database operations performed locally will continue to immediately fire events, allowing your application to continue behaving normally. Additionally, each operation performed locally will automatically be queued and retried upon reconnection to the Database server.

To reconnect to the Database and begin receiving remote events, see goOnline().

example

firebase.database().goOffline();

This method should be used after disabling the active connection with goOffline(). Once reconnected, the client will transmit the proper data and fire the appropriate events so that your client "catches up" automatically.

example

firebase.database().goOnline();

example

// Get a reference to the root of the Database
var rootRef = firebase.database().ref();

example

// Get a reference to the /users/ada node
var adaRef = firebase.database().ref("users/ada");
// The above is shorthand for the following operations:
//var rootRef = firebase.database().ref();
//var adaRef = rootRef.child("users/ada");

An exception is thrown if the URL is not a valid Firebase Database URL or it has a different domain than the current Database instance.

Note that all query parameters (orderBy, limitToLast, etc.) are ignored and are not applied to the returned Reference.

example

// Get a reference to the root of the Database
var rootRef = firebase.database().ref("https://<DATABASE_NAME>.firebaseio.com");

example

// Get a reference to the /users/ada node
var adaRef = firebase.database().ref("https://<DATABASE_NAME>.firebaseio.com/users/ada");