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

[Marc Jansen]

Hey Pedro,

Do you have the firebug plugin? Is it enabled for the link with the 
demo? Would you be so kind to test that as well... because right now I 
cannot reproduce the flickering on my machine! (How could that be?)

This is *really* annoying, I can't get my head around the problem.

Thanks and 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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