[OpenLayers-Dev] Cross-domain problem with a external vector layer in format GeoJSON or GeoJSONP

[Miguel-Angel Manso-Callejo (UPM)]

Dear all,

I'm trying to add a dinamic layer of earthquakes over a tiled WMS layer.
Feeds of earthquakes are provided by USGS 
(http://earthquake.usgs.gov/earthquakes/feed/) in different formats 
included GeoJSON and GeoJSONP.

I have included next Jscript to add the vector layer

             var vector_layer = new OpenLayers.Layer.Vector("GeoJSON", {
                 projection: "EPSG:4326",
                 strategies: [new OpenLayers.Strategy.Fixed()],
                 protocol: new OpenLayers.Protocol.HTTP({
                     url: 
"http://earthquake.usgs.gov/earthquakes/feed/geojson/2.5/day",
                     format: new OpenLayers.Format.GeoJSON({ 
ignoreExtraDims: true })
                 })
             });
             map.addLayer(vector_layer);

But none of the browsers (IE, FireFox or Chrome) shows the points of the 
earthquakes.

Can any one help me, please?

Best regards,
Miguel A. Manso