[OpenLayers-Users] Missing tiles in OSM map

[Alessandro Candini]

Thank you Andreas, I solved with the following:

.olImageLoadError{display: none !important;}

And what about performance concerns? I see that in Firefox and in IE map 
browsing is definitely slower than in Chrome.
Is a normal difference between browser or it is related to 404 errors?


> Hi,
>
> this no longer works with recent versions (master and upcoming 2.12).
> Instead, just add the following to your application's css:
>
> .olImageLoadError {
>      background-color: transparent !important;
> }
>
> If you want an image showing something like "No imagery for this
> region at the current zoom level", you can also set a
> background-image.
>
> Andreas.
>
> On Wed, Mar 14, 2012 at 3:14 PM, Alessandro Candini<candini at meeo.it>  wrote:
>> Ok, I solved this issue with the following lines:
>>
>> OpenLayers.Util.onImageLoadError = function() {
>>     this.src = "http://localhost/static/img/missingTile.png";
>> };
>>
>> Where missingTile.png is a completely transparent image of size 256x256.
>>
>> The visualization is now perfect on every browser, but using firebug on
>> Firefox I see that every missing tile produces a 404 error anyway.
>> Can this lead to performance issues and is it possible to avoid these calls?
>>
>>
>>> Hi list.
>>> I produce tiles using mapnik (www.mapnik.org) and I use the following map
>>> definition:
>>>
>>> var map = new OpenLayers.Map({
>>>         div: "map",
>>>         allOverlays: true,
>>>         maxExtent: bounds,
>>>         projection: fromProj,
>>>         displayProjection: toProj,
>>>         allowSelection: true,
>>>         controls: [new OpenLayers.Control.PanZoomBar(), new
>>> OpenLayers.Control.Navigation()],
>>>         });
>>>
>>> var layer = new OpenLayers.Layer.OSM(
>>>             layer_dir,
>>>             "tiles/${z}/${x}/${y}.png",
>>>             {zoomLevels: maxZoom, zoomOffset: minZoom, resolutions: res}
>>>         );
>>>
>>> map.addLayer(layer);
>>>
>>> The problem is that I have a visualization issue in IE and Chrome: the
>>> missing tiles are represented as pink squares.
>>> Instead in Firefox the visualization is perfect  because it simply uses a
>>> white background when the tile is missing.
>>>
>>> Is there a map or layer parameter to visualize as white the missing tiles?
>>>
>>> Thanks in advance,
>>>
>>> Alessandro
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/openlayers-users
>>
>>
>> --
>> Alessandro Candini
>> MEEO S.r.l.
>> Via Saragat 9
>> I-44122 Ferrara, Italy
>> Tel: +39 0532 1861501
>> Fax: +39 0532 1861637
>> http://www.meeo.it
>>
>> ========================================
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>
>


-- 
Alessandro Candini
MEEO S.r.l.
Via Saragat 9
I-44122 Ferrara, Italy
Tel: +39 0532 1861501
Fax: +39 0532 1861637
http://www.meeo.it

========================================
"ATTENZIONE:le informazioni contenute in questo messaggio sono
da considerarsi confidenziali ed il loro utilizzo è riservato unicamente
al destinatario sopra indicato. Chi dovesse ricevere questo messaggio
per errore è tenuto ad informare il mittente ed a rimuoverlo
definitivamente da ogni supporto elettronico o cartaceo."

"WARNING:This message contains confidential and/or proprietary
information which may be subject to privilege or immunity and which
is intended for use of its addressee only. Should you receive this
message in error, you are kindly requested to inform the sender and
to definitively remove it from any paper or electronic format."