Checking online status from an iPhone web app

Question

Is there a way to check to see if an iPhone is online from a web app. That is, in mobile Safari, can I check the online status of the device to see if I should try an AJAX call or not.

In Firefox/regular WebKit, this would be:

if(navigator.onLine) 
{
    onlineCode() 
}

Answer 1

img src="http://aonlinesite.com/a-really-little-image.png" onload="Intenet!" onerror="NoInternet!"

Answer 2

A quick test on the iPhone shows that it is available from iPhone OS 2.2.

Answer 3

That same code should work in the WebKit nightly build as of May 16th 2008. I guess that means you need to hope the 2.1 update included a new build of safari.

https://bugs.webkit.org/show_bug.cgi?id=19105