Alternative to Polling. HTML Updates

Question

I am working on a collaborative website that I want to give users notifications while they are viewing or editing data. Something similar to how in StackOverflow if you are replying to a question and the notification at the top pops up saying that there is a new reply to the post.

I can see how to do this using some kind of polling AJAX magic, but I was wondering if there was any way to push the notification to the browser w/o using polling?

Thanks for any help/ideas :)

EDIT:

For those interested, I went with SignalR https://github.com/SignalR/SignalR/wiki/Hubs

you can't "push" to the client browser, it is disconnected environment, you will have to keep requesting for changes at some interval — Kris Ivanov, Mar 23 '11 at 21:44

score 6 · Accepted Answer · answered Mar 23 '11 at 23:06

6

Either use long polling for it to work in older browsers, or start reading up on eventSource:

http://dev.w3.org/html5/eventsource/

Nice article by Nicholas Zakas:

http://www.nczonline.net/blog/2010/10/19/introduction-to-server-sent-events/

answered Mar 23 '11 at 23:06

Matijs

3,118
2
29
41

Long polling is something I had read about and thought it would work pretty well. But the html 5 stuff is exactly want I want. I hope it makes it into the final release! – joe_coolish Mar 24 '11 at 14:35

score 2 · Answer 2 · answered Mar 23 '11 at 21:42

2

Well im starting to use Websockets (see some of my previous questions) and they are cool to use instead of ajax :-D

answered Mar 23 '11 at 21:42

Naftali

144,921
39
244
303

score 1 · Answer 3 · edited Mar 24 '11 at 04:53

1

Generally no, but there is a family of techniques that simulate such an effect.

Look into comet if you'd like to give it a shot: http://en.wikipedia.org/wiki/Comet_(programming)

edited Mar 24 '11 at 04:53

joe_coolish

7,201
13
64
111

answered Mar 23 '11 at 21:43

Kevin Dolan

4,952
3
35
47

Alternative to Polling. HTML Updates

3 Answers3