[OpenLayers-Dev] Exception in OpenLayers.Layer.Grid.removeBackBuffer

[Tim-Hinnerk Heuer]

Thanks for the quick response, Eric.

Will try to find an example or construct a simple case if I cannot.

On Wed, Mar 14, 2012 at 11:11 AM, Eric Lemoine
<eric.lemoine at camptocamp.com>wrote:

>
>
> On Tuesday, March 13, 2012, Tim-Hinnerk Heuer <th.heuer at gmail.com> wrote:
> > Hi List,
> > Intro: I'm Tim-Hinnerk Heuer, a web developer at Landcare Research New
> Zealand. I've been to the last FOSS4G in Denver and I'm a committer on
> MapFish Print, but mainly a JavaScript-Front-End-Developer. I've learned a
> lot about JavaScript in the past years and even developed an OpenLayers
> extension to OpenLayers.Layer.WMS called OpenLayers.Layer.VideoWMS. You can
> find that at my GitHub @ http://github.com/geekdenz/openlayers . Haven't
> made a pull request yet, because it might not be stable yet...
> > The real reason for my post is (hope this is the right place to post
> this):
> > I've come across an error/exception in OpenLayers, that seems to be
> pretty new (using the latest git master version):
> > In Chrome:
> > Uncaught Error: NOT_FOUND_ERR: DOM Exception 8
> > In Firefox:
> > Node was not found
> > Around line 26075 (in my own built version).
> > I guess line 702 in Layer/Grid.js in the latest build
> > Code around it:
> >     /**
> >      * Method: removeBackBuffer
> >      * Remove back buffer from DOM.
> >      */
> >     removeBackBuffer: function() {
> >         if(this.backBuffer) {
> >             this.div.removeChild(this.backBuffer); // THIS IS THE LINE
> >             this.backBuffer = null;
> >             this.backBufferResolution = null;
> >             if(this.backBufferTimerId !== null) {
> >                 window.clearTimeout(this.backBufferTimerId);
> >                 this.backBufferTimerId = null;
> >             }
> >         }
> >     },
> > Part of the stack trace is:
> > OpenLayers.Layer.Grid.OpenLayers.Class.removeBackBuffer
> > OpenLayers.Layer.Grid.OpenLayers.Class.applyBackBuffer
> > OpenLayers.Layer.Grid.OpenLayers.Class.moveTo
> > OpenLayers.Map.OpenLayers.Class.moveTo
> > OpenLayers.Map.OpenLayers.Class.setCenter
> > OpenLayers.Control.OpenLayers.Class.wheelChange
> > ...
> > It happens when I zoom about in our map or when I open the Print Window,
> which has another map in it. It's only really a problem in the print
> window, because the whole map breaks. In the normal map it is not a problem
> so much, because you only occasionally see that error in the developer
> tools or Firebug.
> > This problem only got introduced recently but I don't know through which
> change. I suspect it has something to do with how I initialize the print
> window. It's using GeoExt's SimplePrint class and quite a bit of custom
> code. (On a side note the print window has been in the app for ages.)
> > It is also only happening when I quickly zoom about and then open the
> print map, not when I wait for everything to load.
> > I suspect it has something to do with the fact that the print window has
> an extra vector layer with a rectangle of where the to be printed map is
> and that it gets set as the base layer. However, I tried explicitly
> removing it and adding it later and also tried to do a
> map.setBaseLayer(myBaseLayer) to no avail. In fact that line throws the
> same error.
> > Please help if you can, this bug has been annoying me for quite some
> time now already.
> > Thanks,
> > Tim
> > Twitter: @timhheuer
> > Blog: http://www.thheuer.com
>
>
> Hi Tim
>
> This may be a bug in the new backbuffer code. To debug this we'd need a
> simple example (w/ no print window) that exhibits the bug. Have you tried
> reproducing the issue with one of the OpenLayers example?
>
> --
> Eric Lemoine
>
> Camptocamp France SAS
> Savoie Technolac, BP 352
> 73377 Le Bourget du Lac, Cedex
>
> Tel : 00 33 4 79 44 44 96
> Mail : eric.lemoine at camptocamp.com
> http://www.camptocamp.com
>
>
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