mapserver with WMS call with openlayers - wms

Question

I scenario is below :
map is shown under from TiledWMS layer from mapserver. It has 2 layers.
TiledWMS layer for OSM world map.
TiledWMS layer for layers defined in kml file placed in mapserver through .map file. This map file contains many layers.
Now , when user click on map : it got 2 layers as above.
But since 2nd layer is made up of different layers as given in .map file , i am not able to uniquely identify these layers. I want that since 2 nd layer is made up of different layers in kml file i should be able to uniquely identify them on mouse click or hower.
Thanks
Satpal

Answer 1

I am able to get it : below is samaple code for others.
var coord = evt.coordinate;
var pixel = $scope.map.getPixelFromCoordinate(coord);
var viewProjection = $scope.map.getView().getProjection();
var viewResolution = $scope.map.getView().getResolution();
var numberOfLayersOnMap = $scope.map.getLayers();
var feature = $scope.map.forEachFeatureAtPixel(pixel, function(feature, layer){return feature;}, null, function(layer) {return true;});
if(feature === undefined)
{
$scope.map.forEachLayerAtPixel(pixel, function (layer)
{
if(!layer)
{
return ;
}
var urlWMSGetFeatureInfo = layer.getSource().getGetFeatureInfoUrl(coord, viewResolution, viewProjection, {
'INFO_FORMAT': 'application/vnd.ogc.gml'
});
if(urlWMSGetFeatureInfo.indexOf("osm-google.map")<0)
{
$http({
method: 'GET',
url: urlWMSGetFeatureInfo,
}).success(function(data){
var parser = new ol.format.WMSGetFeatureInfo();
var features = parser.readFeatures(data);
if(features.length>0)
{
var featureName = features[0].n.Name;
topOverlayElement.innerHTML = featureName;
$scope.highlightOverlay.setFeatures(new ol.Collection());
if($scope.flagLinkage == true)
{
var xmlObj = utility.StringToXML(data);
var xmlDocumnet = xmlObj.childNodes[0];
var layerNode = xmlDocumnet.children[0];
var gmlLayerNode = layerNode.children[0];
var layerName = gmlLayerNode.textContent;
var layerInfoObject = {};
layerInfoObject.layerName = layerName;
//layerInfoObject.placemarkName = featureName;
$scope.placemarksSelectedObject.push(layerInfoObject);
$scope.placemarksSelectedFeatureObject.push(features[0]);
}
else
{
$scope.placemarksSelectedFeatureObject.length = 0;
$scope.placemarksSelectedFeatureObject.push(features[0]);
}
$scope.highlightOverlay.setFeatures(new ol.Collection($scope.placemarksSelectedFeatureObject));
var featureDescription = features[0].n.description;
middleOverlayElement.innerHTML = (featureDescription === undefined) ? '' : featureDescription;
$scope.showOverlay(coord);
}
}).error(function (data) {
console.log("Not able to get capabilty data.");
});
}
else
{
$scope.closeOverlay(evt);
}
});