[Qtwebengine] How to tell when DOM resources finishes downloading?

[Kevin Truong]

Good idea about mutation observers, thanks! I'll take a look and see how
well it does.

On Thu, Dec 17, 2015 at 5:24 AM, Koehne Kai <Kai.Koehne at theqtcompany.com>
wrote:

>
>
> > -----Original Message-----
> > From: Kevin Truong [mailto:knt261 at gmail.com]
> > Sent: Tuesday, December 15, 2015 10:07 PM
> > To: Koehne Kai <Kai.Koehne at theqtcompany.com>
> > Cc: qtwebengine at qt-project.org
> > Subject: Re: [Qtwebengine] How to tell when DOM resources finishes
> > downloading?
> >
> > Thanks Kai -- I'll take a look at the submission process later this week.
> >
> > Yeah I agree with you it isn't the perfect solution. After the render
> > downloads the ajax or iframe, I make it wait 100ms and hope it loads into
> > the DOM. This gets most pages correct, but isn't perfect and many still
> > serialize too early. Do you have a better idea/suggestion? I know you
> > suggested this before:
> >
> > > If you know the HTML/AJAX of the specific page, you might be able to
> > hook up
> > a JS handler that is called when the AJAX request is done, and then
> signal
> > this to the
> > C++ world , e.g. via QWebChannel.
> >
> >
> > If I understand it correctly, this means I have to know beforehand which
> > node gets inserted into the HTML via the ajax/iframe right? E.g. <div
> > id="ajax">, and in the javascript, I repeatedly test if div[id=ajax]
> exists in the
> > HTML?
>
> You indeed have to have knowledge about the page to really decide when it
> is 'finished', because that's a semantic property. Some page might e.g.
> send
> AJAX requests forever (think about a twitter timeline that updates itself
> regularly).
>
> Anyhow, an alternative would be to just wait until the DOM isn't updated
> anymore
> for some time, but from within the page. You should be able to implement
> this with
> the help of DOM  Mutation Observers , e.g. something like this
>
> observer.observe(document.documentElement, {
>     childList: true,
>     subtree: true
> });
>
> and a timer.
>
> > I prefer not to use this approach, since my test suite have over 1K
> > URLs and I prefer not to write 1K rules by hand for each URL. I'm
> looking for
> > a general way to tell (or approximately tell) when the
> ajax/iframe/specific
> > plug in loads into the DOM, and the signal I patched is currently the
> only
> > thing I could think of.
>
> Fair enough.
>
> Regards
>
> Kai
>
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