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Re: [NavigationTiming] waiting for loadEventEnd to get set

From: Larry Martell <larry.martell@gmail.com>
Date: Fri, 6 Jul 2012 06:42:32 -0600
Message-ID: <CACwCsY6rXQZMU6c20VF=VKy6zSwx=YubPJQ129HPp61teq-nNQ@mail.gmail.com>
To: Patrick Meenan <pmeenan@webpagetest.org>
Cc: "public-web-perf@w3.org" <public-web-perf@w3.org>
On Fri, Jul 6, 2012 at 5:24 AM, Patrick Meenan <pmeenan@webpagetest.org> wrote:
> Try a 0-length setTimeout. LoadEventEnd can't be set until the
> execution of all onload handlers completes (including the one you are
> using to measure).

Thanks. That worked.

> You could also just use loadEventStart which is probably what you want
> from what you describe anyway.

I am trying to measure how long it takes for the browser to render the
page after it has received all the data from the server.  So don't I
need loadEventEnd for that?

> On Jul 6, 2012, at 3:49 AM, Larry Martell <larry.martell@gmail.com> wrote:
>> I'm trying to use the Navigation Timing package to measure how long a
>> page takes to be rendered. So that would be loadEventEnd-responseEnd,
>> however I am finding that loadEventEnd is always 0 for me, even though
>> I am accessing it from within a window.onload function, e.g:
>> window.onload = function() {
>>    var t = performance.timing;
>>    var render_time = parseInt(t['loadEventEnd']) - parseInt(t['responseEnd']);
>> }
>> If I check in the console after the page is loaded it does have a
>> value.  What event do I have to wait for before loadEventEnd gets set?
>> Thanks!
>> -larry
Received on Friday, 6 July 2012 12:42:54 UTC

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