Adding a protocol for reading features cross-origin from services that support JSON with a callback. r=erilem (closes #2956)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@11691 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

examples/cross-origin.js

@@ -0,0 +1,39 @@
+var map = new OpenLayers.Map({
+    div: "map",
+    layers: [
+        new OpenLayers.Layer.WMS(
+            "World Map",
+            "http://maps.opengeo.org/geowebcache/service/wms",
+            {layers: "bluemarble"}
+        ),
+        new OpenLayers.Layer.Vector("States", {
+            strategies: [new OpenLayers.Strategy.BBOX()],
+            protocol: new OpenLayers.Protocol.Script({
+                url: "http://suite.opengeo.org/geoserver/wfs",
+                callbackKey: "format_options",
+                callbackPrefix: "callback:",
+                params: {
+                    service: "WFS",
+                    version: "1.1.0",
+                    srsName: "EPSG:4326",
+                    request: "GetFeature",
+                    typeName: "world:cities",
+                    outputFormat: "json"
+                },
+                filterToParams: function(filter, params) {
+                    // example to demonstrate BBOX serialization
+                    if (filter.type === OpenLayers.Filter.Spatial.BBOX) {
+                        params.bbox = filter.value.toArray();
+                        if (filter.projection) {
+                            params.bbox.push(filter.projection.getCode());
+                        }
+                    }
+                    return params;
+                }
+            })
+        })
+    ],
+    center: new OpenLayers.LonLat(0, 0),
+    zoom: 1
+});
+