[Webkit-unassigned] [Bug 35168] New: Please add WebFrameLoadDelegate callback for "didReceiveHead"

Fri Feb 19 11:52:39 PST 2010

https://bugs.webkit.org/show_bug.cgi?id=35168

           Summary: Please add WebFrameLoadDelegate callback for
                    "didReceiveHead"
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: Mac OS X 10.6
            Status: NEW
          Severity: Enhancement
          Priority: P3
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: dwood at karelia.com

I am finding that it would be useful to get a callback in my
WebFrameLoadDelegate when the <head> element of a page has been loaded, so I
can examine the various head elements (language, meta tags, scripts, etc.) as
soon as possible.

We have a very handy callback webView:didReceiveTitle:forFrame:  and a similar
one for the icon, but these are too specialized. It would be very useful to
just have a general notification of the entire <head> being loaded.  I could
then inspect the DOM for the pieces I need.

I have two suggestions for what this callback could look like.  A simpler API
would be one that just requires you to fetch the DOMDocument for the frame, so
the API might look like this:

 - (void)webView:(WebView *)sender didReceiveHeadForFrame:(WebFrame *)frame

Or, since the obvious thing you will need once you have received the head is to
do some checking of the Head DOMNode, the API might look like this:

 - (void)webView:(WebView *)sender didReceiveHead:(DOMNode *)headNode
forFrame:(WebFrame *)frame

However, in practice, it might not be that useful to give us the head, since
the client might actually want to invoke something like  [[frame DOMDocument]
getElementsByTagName:@"meta"] right away, and won't really care about the
DOMNode of the head that got passed to it.

So I would vote for the first, simpler API.

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