[OpenLayers-Users] How can I get the bounds of the map when zooming?

[Heidt, Christopher M.]

http://dev.openlayers.org/releases/OpenLayers-2.8/doc/apidocs/files/OpenLayers/Map-js.html#OpenLayers.Map.getExtent


-----Original Message-----
From: users-bounces at openlayers.org on behalf of Adrián Ribao Martínez
Sent: Sat 9/5/2009 5:32 AM
To: users at openlayers.org
Subject: [OpenLayers-Users] How can I get the bounds of the map when zooming?
 
Hello,

I need to show some points loaded using ajax and geojson into the map. I want the points to be just in the area of the map that is shown, so when I zoom I need the bounds of the map and make a new ajax request with the bounds as parameters.

Can this be done? Where can I find examples and docs about this?

I think it would work like this:

1. Load the map with some features
2. The user zooms in a region
3. I get the bounds of the map and call an ajax function with the bounds as parameter
3. I retrieve the new geojson with the points of that area and draw the into the map

I need to do this in order to increase the number of features available in the map when the users zoom into a region.

Any example would be great, as I'm starting with openlayers, geodjango and gis systems and It's hard at the beginning :)

Best regards,

Adrian Ribao

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