Just like in SO, where one is answering a question, if somebody has answered said question, a notification will appear (via AJAX?). My only way of somewhat replicating this is by including a timeout on my script that fetches if there is an update every n seconds. Is there a way to do this using observer pattern on PHP + Javascript (w/ jQuery)?
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- duanpu8830 2009-10-27 07:55关注
you have to look at the ReverseAJAX or COMET methodologies.
As per wikipedia
Reverse Ajax refers to an Ajax design pattern that uses long-lived HTTP connections to enable low-latency communication between a web server and a browser. Basically it is a way of sending data from client to server and a mechanism for pushing server data back to the browser.
EDIT:
i suggest you to implement the following approach, this is simple to implement. I take stackoverflow answering as an example.
- After the answer page load complete. Initiate a AJAX request (Asynchronos, so it wont block the UI)
- And it will look for any new updates on the server side (polling the DB to check if any new answers added)
- And return the data only to browser, if there is an update. otherwise stay calm.
- After returning the data to client, client should invoke the another AJAX request and wait for the updates.
- Repeat step 2 to 4 for the rest of the page life time.
Hope this helps.
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