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Hi gang,

I need to use AJAX API to find out if a civicrm extension is installed.

A small, virtual, prize to the submitter of the successful answer!

Thanks,

Hi, thanks for responding

Regrettably, in 4.2 I just get invited to the API team to implement it!

In this case, I think he's unlucky. The internals of the extension system were significantly reworked between 4.2 and 4.3. To write a similar API for 4.2, you might be able to call CRM_Core_Extensions->getExtensionsByKey() and then check the "$status" property on each. Those statuses won't match-up 1:1 with the statuses in 4.3:

 * The statuses in 4.2 are "installed", "missing", "local", "remote". (IIRC, "local" means "uninstalled in DB but installed on local filesystem" and "remote" means "uninstalled in DB and uninstalled in local filesystem".)
 * The statuses in 4.3 are "installed", "disabled", "uninstalled", "installed-missing", "disabled-missing", and "unknown".

To provide better compatibility, I'd suggest the 4.2 API try to map statuses to 4.3 names:

 * 4.2 installed ==> 4.3 installed
 * 4.2 missing ==> 4.3 unknown
 * 4.2 local ==> 4.3 uninstalled
 * 4.2 remote ==> omit from listing

(I'm not 100% on those mappings -- in particular, I don't remember how 4.2 distinguished "disabled" from other statuses... you'd need to study it...)