[OpenLayers-Users] Forcing a redraw of a Vector Layer

[Adrian Popa]

Hello everyone,

I'm using a Vector layer with a BBOX strategy and gets dynamic data from 
a KML file and it works as expected. However, the data I'm displaying is 
kind of dynamic (alarms which come and go) and I would like to 
automatically refresh the layer (without doing a page reload) from time 
to time. I've tried using the redraw() function, but it doesn't refresh 
the data (since it detects the BBOX hasn't changed).

Is there any way to force the layer to re-request the data?

Here's my layer definition:

locations = new OpenLayers.Layer.Vector("Alarm Locations", {
                        projection: map.displayProjection, 
minResolution: 1, maxResolution: 38,
                        strategies: [new OpenLayers.Strategy.BBOX()],
                        protocol: new OpenLayers.Protocol.HTTP({ url: 
"kml_locations.pl", format: new OpenLayers.Format.KML({ extractStyles: 
true, extractAttributes: true })})});
map.addLayer(locations);

setTimeout('locations.redraw()', 30000);

Regards,
Adrian