Is there any module I can use to display limited points on OpenLayers using bbox-filtering in Drupal?
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2 Answers
try http://drupal.org/project/views_geojson
with the latest version of views_geojson and openlayers you can define a view (of type geojson) that accepts a bounding box as a parameter.
With openlayers you can set the layer to use a bbox strategy so when you drag the map around it will send the bbox coords to the geojson view and just return points within that area.
I am new to Drupal and Im not going to lie this was a bit of a bastard to setup because there is not much documentation. I couldn't get the bbox contextual filter to work so I setup a custom filter that used top,bottom,left,right then wrote a rewrite rule in an .htaccess file that split the default parameter passed from the openlayers front end (a GET variable like BBOX=42,124,43,125) into the four filter parameters. This will NOT work if you expect your map to cross the equator or 0 meridian. But it works for me and I still hope to get contextual filters working at somepoint.
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The module has a BBOX contextual argument. It works like a charm using open layers.I needed to select 'provide default value' then 'Bound box from query string' as that's how open layers provide for it. Commented Jan 2, 2013 at 17:24
I would think you'd simply define this in the OpenLayers config admin/structure/openlayers/maps however, I didn't find it unfortunately. I think it's somewhere buried in the config options though.
