Re: nsIDocumentObserver bug (maybe).

Michael A. Borisov wrote:
> Hello everybody,
> 
> Can anybody help me with DocumentObserver please? I've created a child of
> nsIDocumentObserver than registered it with the nsIDocument::AddObserver
> method. I use BeginLoad and EndLoad methods to determin the start and end of
> document loading. But sometimes EndLoad isn't invoked (for some sites). Is
> it bug or feature? And what is the right way to determin the document
> loading end?

You probably want nsIWebProgress.  Here is code I used to hook document 
load.

// hook a web progress listener so we know when messages have
// finished rendering.
var interfaceRequestor =
     document.getElementById('messagepane').docShell.QueryInterface
    (Components.interfaces.nsIInterfaceRequestor);
var webProgress =
    interfaceRequestor.getInterface(
       Components.interfaces.nsIWebProgress);
msgWindowWebProgressListener = new nsMsgWindowWebProgressListener();
webProgress.addProgressListener(msgWindowWebProgressListener,
              Components.interfaces.nsIWebProgress.NOTIFY_STATE_WINDOW);

And the implementation:

function nsMsgWindowWebProgressListener()
{
}
nsMsgWindowWebProgressListener.prototype =
{
   QueryInterface : function(aIID) {
     if (aIID.equals(Components.interfaces.nsIWebProgressListener) ||
         aIID.equals(Components.interfaces.nsISupportsWeakReference))
       return this;
    throw Components.results.NS_NOINTERFACE;
  },
   onStateChange : function(aWebProgress, aRequest, aStateFlags, aStatus) {
     if ((aStateFlags & ListenerState_Finished) == ListenerState_Finished) {
...
}
}

HTH,

Mark.