[OpenLayers-Users] Image flickering in Firefox when changing the URL of an image layer

[Pedro Baracho]

Also for the record

---------- Forwarded message ----------
From: Pavel Iacovlev <iacovlev.pavel at gmail.com>
Date: Wed, Nov 18, 2009 at 11:30 AM
Subject: Re: [OpenLayers-Users] Image flickering in Firefox when changing
the URL of an image layer
To: Pedro Baracho <pedropbaracho at gmail.com>


Using Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.5)
Gecko/20091102 Firefox/3.5.5

I see the flickering

On Wed, Nov 18, 2009 at 3:18 PM, Pedro Baracho <pedropbaracho at gmail.com>
wrote:
> For the record, I am currently using FF 3.5.5, Gecko/20091102 on Windows
and
> I don't see any flickering in the link you posted.
>
> On Wed, Nov 18, 2009 at 11:10 AM, Marc Jansen <jansen at terrestris.de>
wrote:
>>
>> Hi list,
>>
>> when the URL of an imagelayer is changed via the APIMethod setUrl, the
>> image is flickering regardless of the browser cache or the transition
>> effect. This behaviour can be seen e.g. here:
>>
>> http://www.webmapcenter.de/wetterradar/animation.html
>>
>> In that demo the URL of the imagelayer is changed every 500 ms and the
>> flickering should be easy to spot (at least if you wait for roughly 20
>> seconds). Firebugs Net-tab shows that the images are being requested
>> over and over.
>>
>> The flickering is only noticeable in Firefox (3.5 Win and Linux); Opera
>> 10 and IE 8 work like a charm (they cache the varying images). The
>> changing of the src of a pure <img> with JavaScript does not show the
>> flickering (as can be seen in the above link, too). I don't have results
>> for other browsers.
>>
>> Can anybody help me identify the root of this flickering? I am unsure
>> whether this Firefox bugreport is maybe relevant to this issue:
>> https://bugzilla.mozilla.org/show_bug.cgi?id=492052. I doubt that it is
>> related to apache settings (Caching- or Expires-Headers) as the pure JS
>> solution isn't flickering at all.
>>
>> Any help or advice on this issue would be great!
>>
>> Regards,
>> Marc
>>
>> BTW.: If someone shows me a better alternative to build an animation of
>> different Imagelayers, I would be happy as well :-)
>>
>>
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>
>
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