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

[Mike Quentel]

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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