[webkit-dev] Catching events in JavaScript and the onload event

Luka Napotnik luka.napotnik at gmail.com
Tue Oct 2 00:26:03 PDT 2012

Ok I understand that the engine works very asynchronous and as both of
you said that it's basically impossible to say when the page is ready
to be rendered.

I still have some questions:

Does WebKit have some sort of 'resource loaded' event that tells which
**known** resources are already loaded or scheduled to be loaded.
And do changes to DOM get deferred till a scheduler picks them up and
changes the tree. Because if this is the case, one could check what's
the load status of DOM.


On Mon, Oct 1, 2012 at 2:59 PM, Jussi Kukkonen <jussi.kukkonen at intel.com> wrote:
> On Mon, Oct 1, 2012 at 11:02 AM, Luka Napotnik <luka.napotnik at gmail.com> wrote:
> > Hello.
> >
> > Thanks for the reply. So my best bet is to add some sort of a timeout that
> > will trigger the rendering and hoping that the page is fully loaded? If I
> > would implement such a signal that triggers itself when all the resources
> > are 100% ready(DOM + resources) what's the best place to look at?
> >
> > And .. is there a way to look if the JS engine idles or is executing code?
> Just to add to Mihais answer: A "ready" signal not exist because it's
> just not possible to define what that means because scripts can change
> things at any point in time. That doesn't mean things couldn't be
> easier: There's the img.complete property that you should be able to
> use to check on your images but that has some issues that prevent it
> from being too useful at the moment.
> First, it's not really implemented as specified (if anyone is willing
> to look at my patches in webkit.org/b/28832 and webkit.org/b/95440
> that would be great). If the implementation was correct it might be
> more useful for you than just onload but note that the specification
> still explicitly says that the value of img.complete can change during
> the execution of your script
> (http://www.w3.org/TR/html5/the-img-element.html#dom-img-complete),
> even after onload...
> HTH,
>   Jussi

Luka Napotnik,

www: http://napotnik.info

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