You probably want to use nsIObserver/nsIObserverService interfaces to call
into your javascript from C++ XPCOM. So in your javascript you implement the
nsIObserver interface, like so:
// your JS code
var myObserver = { observe : function(subject, topic, data) {
if (topic == "myTopic") {
// callback from C++ XPCOM
}
}
};
// your JS code
// register the observer
var observerService =
Components.classes["@mozilla.org/observer-service;1"].
getService(Components.interfaces.nsIObserverService);
observerService.addObserver(myObserver, "myTopic", false);
// your C++ code:
nsCOMPtr<nsIObserverService> observerService =
do_GetService("@mozilla.org/observer-service;1");
observerService.NotifyObservers (mySubject, "myTopic", myData);
The Observer Service will call all registered observers when a notification
of type "myTopic" is received. The registered "myTopic" observer in the JS
will get invoked when the NotifyObservers method is called from C++.
HTH
-Sandip
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Friday, June 23, 2006 10:36 AM
To: [email protected]
Subject: Calling JS functions from XPCOM component (FF 1.5)
Hi,
I have written an C++ XPCOM component that correctly loads into Firefox
1.5, and I can successfully call methods on the component thanks to
XPConnect. What I would like to do now is allow the component to call
back into the javascript VM, as I can do with an IE ActiveX control
using ActiveX "events". Is it possible to do this? I would guess the
method would be something like this:
- Use the DOM from C++ to find a JS method which must be defined in the
script code of the calling web page. Alternately this method could be
passed to my component as an argument of some kind.
- Use some kind of magic glue code (nsXPConnect?) to call the JS
function from C++, packaging up the arguments as necessary.
So far I've found nothing to describe this process on the XPConnect
(http://www.mozilla.org/scriptable/) or XPCom
(http://www.mozilla.org/projects/xpcom/index.html) sites, and google
searches haven't helped either.
Can anyone explain A) if what I want to do is possible, and B) how to
do it or at least a pointer to the right header file.
I should point out that I am NOT building the Mozilla source code. I
am building my component on Win32 using the precompiled gecko SDK
(v1.8b1).
Thanks in advance,
Kevin
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