[OpenLayers-Users] Problem with Protocol HTTP and vector layer

[Jérome Freyre]

Hi all,

Firstly, sorry for my english...

I'm working since few month with Open Layer and I think it is really fun

Currently, I have a map with my own WMS server and a vector layer  
based on strategies and protocol (HTTP) like that :
function init() {
.....
var myprotocol = new OpenLayers.Protocol.HTTP({
	format: new OpenLayers.Format.GeoJSON(),
  	url: "getGeoJSON.php",
	params: {idView: 169,model: 'startEnd'}
});

// setup tiled layer
var  base = new OpenLayers.Layer.WMS(
	"frj:world - Tiled", "http://localhost:8080/geoserver/wms",
         {srs: 'EPSG:4326',layers: 'frj:world',format: 'image/ 
png',tiled: 'true'},
         {buffer: 0}
);

// setup vector layer
view = new OpenLayers.Layer.Vector("View", {
	strategies:  [new OpenLayers.Strategies.Fixed()],
	protocol: myprotocol,
	styleMap: new OpenLayers.StyleMap({
		"default": style,
		"select": {fillColor: "#8aeeef",strokeColor: "#32a8a9"}
	})
});

map.addLayers([base, view]);

...

}

When I refresh the page, the map and the layer with my features  
corresponding on idView are correctly displayed.

The problem is that I have a xhtml select list with other views. When  
I select an other view, I have to load features that corresponds to  
the selected view.
Based on the example (http://openlayers.org/dev/examples/protocol-gears.html 
), I create a method called sync :

function sync() {
	resp = view.protocol.read();
	if (!resp.success()) {
		alert("reading failed");
	        return;
	}
	view.destroyFeatures();
	if (!resp.features || resp.features.length <= 0) {
		alert("No features to read");
	        return;
	}
	view.addFeatures(resp.features);
	alert("features successfully read");
}


view.protocol.read() is correctly working (I saw the call to  
getGeoJSON in firebug) and my getGeoJSON.php return the correct  
GeoJSON. But my function always do the alert on the "reading failed"  
and I don't understand why!?

I saw that resp.features is null.

So, I tried to create a new protocol and call the read() method but  
the problem persist:
myprotocol = new OpenLayers.Protocol.HTTP({
	format: new OpenLayers.Format.GeoJSON(),
         url: "test4_.php",
         params: {
         	idView: 169, //, callback: "changeClass"
                 model: 'startEnd'
	}
});
resp = myprotocol.read();

Does anyone has an idea?

Thank a lot,
Jerome F.
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