[OpenLayers-Users] Problem dynamic loading a KML file (refresh)

[Arnd Wippermann]

some suggestions
 
you don't need to remove your kml_layer, you have only to refresh the layer
with the new url to the kmlfile.
 
you can delete OpenLayers.Strategy.BBOX, because a kmlfile is always loaded
in whole.

example how to refresh your layer
http://gis.ibbeck.de/ginfo/apps/OLExamples/OL212/protocol_refresh/protocol_r
efresh.asp
 
Regards,
Arnd
http://gis.ibbeck.de
 
 
  _____  

Von: openlayers-users-bounces at lists.osgeo.org
[mailto:openlayers-users-bounces at lists.osgeo.org] Im Auftrag von robertico
Gesendet: Samstag, 10. November 2012 06:52
An: openlayers-users at lists.osgeo.org
Betreff: Re: [OpenLayers-Users] Problem dynamic loading a KML file (refresh)


After a night slogging, i found my solution;
I'd like to share my solution and any suggetion is appreciated.
I've created a function to add the (KML) vector layer;

	function AddLayer()

	{

		// If layer (kml_layer) already exists, remove it before
adding the new one

		if (kml_layer) 

		{ 

		map.removeLayer(kml_layer); 

		//kml_layer.destroyFeatures();		// not sure if this
is necessary. Works well without it.

		} 	

		

		// Get file name (.kml file) 

		filename = document.getElementById('theFile').value;

		

		kml_layer = new OpenLayers.Layer.Vector("KML", {

			projection: map.displayProjection,

			strategies: [new OpenLayers.Strategy.Fixed(),

			new OpenLayers.Strategy.BBOX({resFactor: 1.1}),

			//new OpenLayers.Strategy.Cluster()],		//
only usefull if you want to cluster your markers

			protocol: new OpenLayers.Protocol.HTTP({

				url: filename,

				format: new OpenLayers.Format.KML({

					extractStyles: true,

					extractAttributes: true,

					maxDepth: 10

				})

			})

		});

		

		map.addLayer(kml_layer);

	}

Also added the function to the 'onClick' event of the button;

<input type="button" value="Show Markers" onClick="AddLayer()">

The hardest part was to find the right way to remove an existing layer.
Tried several examples but this one works well.



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