AW: [OpenLayers-Users] zoom to feature(s) extent

[Arnd Wippermann]

Hi,

for vector layers you can use

map.zoomToExtent(yourVectorLayer.getDataExtent());

after all features are loaded.

Arnd
 

-----Ursprüngliche Nachricht-----
Von: openlayers-users-bounces at lists.osgeo.org
[mailto:openlayers-users-bounces at lists.osgeo.org] Im Auftrag von arbormagna
Gesendet: Montag, 19. Dezember 2011 00:45
An: users at openlayers.org
Betreff: [OpenLayers-Users] zoom to feature(s) extent

Hi to all,

I am developing my app and every day I keep bumping in walls.

Today I spend 12 hours trying to figure how to zoom to the extent of the
queried features, but couldn't sort it out.
I use *zoomToExtent(vector_layer.getExtent())*,

 but it zooms somewhere in the middle atlantic :).

In the firebug, when I call 

*getExtent()*
 
it returns it. If I say 

*new OpenLayers.Bounds(vector_layer.getExtent())*

 it returns just left boundary?!

If I try *vector_layer.calculateBounds* or *getBounds* it returns
"undefined".

The strangest thing is when I call *vector_layer.geometryType*  it returns
Null, although map displays all polygons perfectly.

Can anybody help, I would be very grateful  - this just makes me out of
myself :). 

Here is the code:

var map, osm, kml;
 
        upit="/kml/";
        {%if search_details%}

        upit="/kml/?q={{x}}&r={{y}}";

        {%endif%}

function init(){


        var options = {maxExtent: new OpenLayers.Bounds(
            1813816.431496, 5245458.4167548, 2178341.4193136,
5664389.3081316),
        units: 'm',
        projection: new OpenLayers.Projection('EPSG:900913'),
        displayProjection: new OpenLayers.Projection('EPSG:3908')

        }
            map = new OpenLayers.Map('map', options);

            map.addControl(new OpenLayers.Control.LayerSwitcher());
            map.addControl(new OpenLayers.Control.MousePosition());

            osm = new OpenLayers.Layer.OSM(
                "OSM");

            kml = new OpenLayers.Layer.Vector("KML",
               {
            projection: new OpenLayers.Projection('EPSG:4326'),
            protocol: new OpenLayers.Protocol.HTTP({
                url: upit,
                format: new OpenLayers.Format.KML({
                    extractAttributes: true,
                    extractstyles: true
                })
            }),
            strategies: [new OpenLayers.Strategy.Fixed()]}); 

            map.addLayers([osm, kml]);

        var google_satellite = new OpenLayers.Layer.Google('Google', {
        type: google.maps.MapTypeId.SATELLITE
    });
    map.addLayer(google_satellite);

/*map.zoomToExtent(
               new OpenLayers.Bounds(
                    1813816.431496, 5245458.4167548, 2178341.4193136,
5664389.3081316))*/

 map.zoomToExtent(new OpenLayers.Bounds(kml.getExtent()))




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