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JavaScript

Samuel Altarac
Samuel Altarac
4,961 Points
Posted by Samuel Altarac
Samuel Altarac
4,961 Points

AJAX server-side event listener

If I'm making a chat app, I need my browser and my friend's browser to refresh after each posted message. How can I listen for a post to mysql database so that i can refreshed the content that gets loaded into my chat app?

1 Answer

Andrew Dunn
Andrew Dunn
14,718 Points
Andrew Dunn
Andrew Dunn
14,718 Points

Someone else may correct me on this, but AJAX doesn't work this way on its own. I've researched this one lots of times over the years, and haven't really come up with a viable, standards compliant solution - but apparently there are some hackish ways of getting around the limitations, such as using a hidden iframe.

Here's a wiki article on Comet (Reverse AJAX) http://en.wikipedia.org/wiki/Comet_(programming)

And here's a crazy PHP tutorial on 'pushing' an update notification to a user's browser. http://www.zeitoun.net/articles/comet_and_php/start