[OpenLayers-Users] Re: removing a layer

[Imran Rajjad]

I think the correct function is

layer.destroyFeatures();

which will empty the vector layer. You should not remove or re-initialize
the layer. It makes sense to remove the layer from the map if you do not
need it further.

regards,
Imran
On Fri, Jan 20, 2012 at 3:19 AM, Puneet Kishor <punk.kish at gmail.com> wrote:

> I am completely at my wits end. I am trying to check if a vector layer
> exists, and if it does, I need to either completely remove it or remove all
> the features from it (whichever is more efficient from the point of speed
> and memory), and then redraw that layer. Have been trying all sorts of
> permutations and combinations, but am just not successful.
>
> My latest code attempt is below, and the original attempt is below that
> from my OP.
>
>    var arr = map.getLayersByName("Vector layer");
>
>    if (arr.length) {
>        //map.removeLayer(arr[0]);
>        layer.removeAllFeatures();
>    }
>    else {
>        layer = new OpenLayers.Layer.Vector("Vector layer", {styleMap:
> myStyles});
>    }
>
> Neither `map.removeLayer(arr[0])` nor `layer.removeAllFeatures()` works.
>
> Would appreciate suggestions.
>
> On Jan 19, 2012, at 3:00 PM, Puneet Kishor wrote:
>
> > I am trying to remove a layer with
> >
> >    if (map.getLayerIndex(layer) > 0) {
> >        map.removeLayer(layer);
> >    }
> >
> > but no joy. How can I remove a layer?
> >
> > A bonus question: if I want to reconstruct a  vector layer on map
> "zoomend", that is, redraw all the features on it so they are resized
> accordingly, should I remove the layer (hence, the question above), or
> simply remove all the features and redraw the features? If the latter, then
> how?
> >
> > Many thanks,
> >
> > --
> > Puneet Kishor
>
>
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>



-- 
I.R
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