I have a web map with Google as base layer. Now I want to add WFS on top
of it, but since the WFS will load entire data, so I need the bounding box
after every pan/zoom so that i can pass those values to geoserver to load
the data of only that area.
You could add a "move" event handler to the map. In that handler you can
call getextent. However, a pan or zoom will call a moveto on all
layers. I dont know what effect that will have on a WFS layer - it may
preempt you.
However, I would strongly suggest that you rethink that design a little.
You will get better performance if you use WMS for displaying the layer
and only use WFS for query/selection.
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