[OpenLayers-Users] how to cleanly remove a vector layer

[Erik Uzureau]

Thanks everyone for this bug report and patch suggestions. I have codified
this in the OL trac:
http://trac.openlayers.org/ticket/761



On 5/30/07, Mike Quentel <mikequentel at yahoo.com> wrote:
>
> Also, add the following to OpenLayers.Layer.Vector:
>
>     destroySelectedFeatures: function () {
>         for (var i = (this.selectedFeatures.length - 1); i >= 0; i--) {
>             var selectedFeature = this.selectedFeatures[i];
>             this.selectedFeatures = OpenLayers.Util.removeItem(
> this.selectedFeatures, selectedFeature);
>             this.renderer.eraseGeometry(selectedFeature.geometry);
>         }
>     },
>
> Mike Quentel
>
> ----- Original Message ----
> From: Mike Quentel <mikequentel at yahoo.com>
> To: Roger Kunkel <rakunkel at ucdavis.edu>
> Cc: users at openlayers.org
> Sent: Wednesday, 30 May, 2007 5:22:48 PM
> Subject: Re: [OpenLayers-Users] how to cleanly remove a vector layer
>
> This might be of help to you...
>
> OpenLayers.Control.EraseFeatures = OpenLayers.Class.create();
> OpenLayers.Control.EraseFeatures.prototype =
>   OpenLayers.Class.inherit( OpenLayers.Control, {
>     /** @type OpenLayers.Control.TYPES */
>     type: OpenLayers.Control.TYPE_BUTTON,
>     trigger: function () {
>       if (this.map) {
>         var map = this.map;
>         for(i = 0; i < map.layers.length; i++) {
>           var currentLayer = map.layers[i];
>           if (currentLayer.isVector) {
>             if (currentLayer.selectedFeatures.length > 0) {
>           currentLayer.destroySelectedFeatures();
>         } else {
>           currentLayer.destroyFeatures();
>         } //if (currentLayer.selectedFeatures...
>           } //if (currentLayer.isVector...
>         } // for (i = 0...
>       } //if (this.map...
>     },
> /** @final @type String */
> CLASS_NAME: "OpenLayers.Control.EraseFeatures"
> });
>
>
> Mike Quentel
>
> ----- Original Message ----
> From: Roger Kunkel <rakunkel at ucdavis.edu>
> To: Christopher Schmidt <crschmidt at metacarta.com>
> Cc: users at openlayers.org
> Sent: Wednesday, 30 May, 2007 3:35:07 PM
> Subject: Re: [OpenLayers-Users] how to cleanly remove a vector layer
>
> Thanks for your reply.
> I was using the removeFeatures incorrectly.
>
>
> On May 30, 2007, at 1:53 PM, Christopher Schmidt wrote:
>
> > On Wed, May 30, 2007 at 01:36:41PM -0700, Roger Kunkel wrote:
> >>
> >> I'm having trouble using and then removing a vector layer.
> >> removeFeatures() - produces errors saying that the feature is not
> >> defined when feature.geometry is referenced.
> >
> > map.layers[1].removeFeatures(map.layers[1].features); works for me on
> > http://openlayers.org/dev/examples/vector-features.html .
> >
> >> calling destroy on the layer causes continuous mouse event errors
> >> - it seems that the getFeatureFromEvent method keeps getting called
> >> even though I've destroyed the layer.
> >
> > Yep. That's a bug. The only piece of advice I have for that is to not
> > destroy a layer if you have selectefatures handler on it :) I'll
> > file it
> > as a bug.
> >
> > Regards,
> > --
> > Christopher Schmidt
> > MetaCarta
>
> Roger Kunkel
> CERES Program
> Dept. of Land Air & Water Resources
> UC Davis
> rakunkel at ucdavis.edu
>
>
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