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

[Kris Geusebroek]

Hi Marc,

I only see the flickering the first time the images are drawn, the
second round no more flickering occurs
I'm using FF on Vista: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US;
rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729)

Cheers Kris

-----Original Message-----
From: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org]
On Behalf Of Marc Jansen
Sent: Wednesday, November 18, 2009 2:38 PM
To: Pedro Baracho
Cc: OpenLayers Users
Subject: Re: [OpenLayers-Users] Image flickering in Firefox when
changing the URL of an image layer

Hi Pedro,

Thanks for your input... but it seems odd: in my FF (Mozilla/5.0 (X11; 
U; Linux i686; de; rv:1.9.1.5) Gecko/20091109 Ubuntu/9.10 (karmic) 
Firefox/3.5.5) the upper OL-client is still flickering. Maybe some 
setting in Firefox I changed? Or a plugin?

I am really puzzled.

Can someone else reproduce the flickering?

Regards,
Marc

Pedro Baracho 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 
> <mailto: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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