[OpenLayers-Users] Is there an easy way to center and zoom the map automatically based on the placemarks that are on it?

[Tobias Reinicke]

The same function is also available for vector layers;
http://dev.openlayers.org/docs/files/OpenLayers/Layer/Vector-js.html#OpenLayers.Layer.Vector.getDataExtent


I presume you will have set your kml layer up somewhere along the lines of;

var myKMLLayer = new OpenLayers.Layer.Vector("KML", {

            strategies: [new OpenLayers.Strategy.Fixed()],
            protocol: new OpenLayers.Protocol.HTTP({
                url: "whatever",
                format: new OpenLayers.Format.KML({
                    extractStyles: true,
                    extractAttributes: true,
                    maxDepth: 2
                })
            })
        };
Then all you do is call
map.zoomToExtent(myKMLLayer.getDataExtent());

That work for you?

Toby




On 4 July 2012 01:21, Aaron E-J <azintirea at gmail.com> wrote:

>  Do you have, or know where I could find, an example of this being
> implemented on KML layer?
>
> Aaron E-Jhttp://www.otherrealm.orghttp://www.prospectdesigns.com
>
> Vision without action is a daydream,
> Action without vision is a nightmare,
> One needs both to succeed.
>
> On 7/3/2012 5:52 PM, Greg Allensworth wrote:
>
> On 7/3/2012 2:11 PM, Aaron E-J wrote:
>
> Is there an easy way to center and zoom the map automatically based on
> the placemarks that are on it?I have it so that one can filter
> placemarks based on user input but I'm not sure how to dynamically
> update the map to fit the newly filtered content.Thanks for any insight
> that can be given regarding this matter.
>
>
> An OpenLayers.Layer.Markers instance, has a method called getDataExtent()
> This should do most of what you want.
>
> It's not automatic, though. You'd still need to call map.zoomToExtent()
> after the markers have been added to the layer.
>
> http://dev.openlayers.org/docs/files/OpenLayers/Layer/Markers-js.html
>
>
>
>
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