How to "stream" json from server to client using javascript

Question

I'm familiar enough with Ajax and JSON that I can send a request and get a parse a JSON request. Ideally I'd like to receive multiple response to periodically update a progress bar. This way clients can have a positive feedback.

I've heard of JSON streams but have not found a good resource on how to implement this. Does anyone know of a good resource or how to do this?

Answer 1

JSON is just yet another format of data going over the HTTP protocol (like text, html, pdf, etc). You are probably referring to cometd.

This allows you to open a persistent connection and push data from the server to the client (ie stream it). Any format is valid to push, the client just needs to understand it.

Answer 2

Found a technique called page streaming.

Basically you write <script>some js</script> entries into the persistent connection and flush them into the network interface. As browser receives that, it will parse and execute the script.