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CometD JavaScript Publish

JavaScript CometD API: Publishing

The publish() method allow you to publish data onto a certain channel:

cometd.publish('/mychannel', { mydata: { foo: 'bar' } });

You cannot (and it makes no sense) to publish to a meta channel, and you can publish to a channel even if you are not subscribed to that channel.
However, you have to handshake before being able to publish.

As with other JavaScript CometD API, publish() involves a communication with the server and it is asynchronous: it returns immediately, well before the Bayeux server has received the message.

Note
Calling publish() does not mean that you have published the message when publish() returns.

If you have to publish several messages to different channels, you may want to use message batching.