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

[Marc Jansen]

Hi list,

thank you all for the many responses to my question.

I have a working solution for my needs: I don't use the API Methods any 
more but use the property

imagelayer.tile.imgDiv.src

directly for read and write access of the image URL (You can see it in 
action at the URL given below).

I am not 100% sure if it'll work in all browsers now, but at least my 
Firefox 3.5 on Ubuntu and another one on Windows Vista is fine now. IE 
is working as well.

Any other arguments against this solution?

Regards and thanks again,
Marc



Marc Jansen 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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