In your case, I'd recommend testing for the existence of a class that
exists in v2 but not v3, and is unlikely to ever exist in v3. Possible
targets are Maps2 and XmlHttp.
if(google.maps.Maps2){
alert("....")
}
or
if(GMaps2){
alert("....")
}
In v2 there's a G_API_VERSION, but that only tells you the sub version
(e.g. it currently returns "184a" not "2.184a") but it's possible that
v3 might get a G_API_VERSION once it comes out of Labs and gets version
management. So that might not be conclusive.
At present, the only way to know what version of v3 you're running is to
look at the src name of the js file:
var scripts = document.getElementsByTagName("SCRIPT")
for (var n = 0 ; n < scripts.length ; n++ ){
var a=scripts[n].src;
if (a.indexOf("main.js")>-1) {
...
}
}
At present the src is
http://maps.gstatic.com/intl/en_gb/mapfiles/api-3/22a/main.js
for v3 and
http://maps.gstatic.com/intl/en_ALL/mapfiles/184a/maps2.api/main.js
for v2.
The problem with that is that Google do change their file naming
conventions from time to time, so you need to have some quite clever
code where I've put the "..." to be certain of coping with such changes.
And there's always the possibility (it's never happened yet) that Google
might change the name from "main.js".
--
Mike Williams
Gentleman of Leisure
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