Since "soils" is created with a new command, you need to delete the
old value
before creating a new object.
There may be better coding, such as testing for existance of soils,
but here is
what I have done in a similar situation
1) make soils global in your script in the outer most block with
var soils;
2) force a known creation of soils, note do not declare another
variable;
soils = new google.maps.KmlLayer( ...
3) to put new kml data
soils.setMap(null); // remove from
display;
delete soils; // delete
the objects data
soils = new google.maps.KmlLayer( ... // add new data to the
object
On Oct 11, 11:26 am, "[email protected]" <[email protected]>
wrote:
> On Oct 11, 7:54 am, Jennifer Dudeck <[email protected]> wrote:
>
> > I have polygons, representing different soil types, stored in a
> > database. What I am attempting to accomplish is to show only the
> > polygons currently in the viewing window. When the bounds or zoom is
> > changed, a function is enacted that gets the KML for a new KMLlayer
> > from a PHP script. All of this works just fine, but there is one
> > hitch. I want to remove the previous KMLlayer every time the bounds/
> > zoom is changed, and replace it with the new KML. However, right now,
> > it is not removing the old KML, just adding the new polygons on top of
> > it. Can anyone help me figure out why my code is not removing the old
> > KML?
>
> have you tried soils.setMap(null); to remove it?
>
> from the
> documentation:http://code.google.com/apis/maps/documentation/javascript/reference.h...
> setMap(map:Map) None Renders the KML Layer on the specified map. If
> map is set to null, the layer is removed.
>
> If that doesn't help, a link might get more assistance.
>
> -- Larry
>
>
>
> > This is the event listener:
>
> > google.maps.event.addListener(map, 'idle', showSoils);
>
> > And this is the actual function:
>
> > function showSoils() {
>
> > //remove previous overlay
> > var soils = new google.maps.KmlLayer();
>
> > var zoomlevel = map.getZoom();
>
> > //if the zoom level is close enough
> > if(zoomlevel>13)
> > {
> > //obtain points in database-friendly format:
> > var bounds = map.getBounds();
> > var ne = String(bounds.getNorthEast());
> > var firstcomma = ne.search("[,]");
> > firstlat = ne.substring(1, firstcomma);
> > firstlong = ne.substring(firstcomma+2, ne.length-1);
>
> > var sw = String(bounds.getSouthWest());
> > var firstcomma = sw.search("[,]");
> > secondlat = sw.substring(1, firstcomma);
> > secondlong = sw.substring(firstcomma+2, sw.length-1);
>
> > bcoords = firstlat + " " + firstlong + ", " + secondlat + " " +
> > firstlong + ", " + secondlat + " " + secondlong + ", " + firstlat + "
> > " + secondlong + ", " + firstlat + " " + firstlong;
>
> > var soils = new google.maps.KmlLayer('http://myfarms.org/test/
> > soils_in_view.php?bcoords=' + escape(bcoords), { map: map,
> > preserveViewport: true });
> > }
> > }
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