[OpenLayers-Dev] Re: Openlayers: Check the map content and tell if the feature exists in the map bound

[vsambhe]

Hi,

I produce the layer as 

var mybounds = new
OpenLayers.Bounds(-1693861.59,6469059.01,-107949.94,7643808.37);
var oMapOptions = null;
 
//-----Define Map options ------------
 
oMapOptions =   {
controls:[
 
 new OpenLayers.Control.Attribution()
, new OpenLayers.Control.PanZoomBar()
 
, new OpenLayers.Control.Scale()
]
, maxResolution: 'auto'
, units: 'm'
, maxExtent: mybounds
, projection: new OpenLayers.Projection("EPSG:900913")
, displayProjection: new OpenLayers.Projection("EPSG:900913")
,eventListeners: {
"zoomend": mapEvent,
"movestart": mapEvent,
"moveend": mapEvent
}
};
 
//-----Create Map Control Object ------------
oMapControl = new OpenLayers.Map ('MapPanel',oMapOptions);
if (oMapControl == null)
{
 return ;
}
.
.
.
.

//----------Vector----------
 
var myscales =
[13867008,6933504,3466752,1733376,866688,433344,216672,108336,54168,27084,13542,6771,3385,1692,846.375];var
oD738e521bc9024f578ad922a7c62b25e0 = new OpenLayers.Style({pointRadius: 16,
fillColor: '#ffcc66', fillOpacity: 0, strokeColor: '#cc6633', strokeWidth:
2, strokeOpacity: 0.1});
var oH738e521bc9024f578ad922a7c62b25e0 = new OpenLayers.Style({pointRadius:
16, fillColor: '#FF0000', fillOpacity: 0.2, strokeColor: '#cc6633',
strokeWidth: 2, strokeOpacity: 0.1});
var oStyleMap738e521bc9024f578ad922a7c62b25e0 = new
OpenLayers.StyleMap({'default': oD738e521bc9024f578ad922a7c62b25e0,'select':
oD738e521bc9024f578ad922a7c62b25e0,
'delete': oD738e521bc9024f578ad922a7c62b25e0,'temporary':
oH738e521bc9024f578ad922a7c62b25e0});
var
oLayerScales=[55168.002,27084.001,13542.0005,6771.0003,3385.5001,1692.7501,846.375];
var oToolTipPreviewLayer = new OpenLayers.Layer.Vector('Incidents 2008',{
styleMap: oStyleMap738e521bc9024f578ad922a7c62b25e0, 
scales: oLayerScales, 
eventListeners: {"featuresadded": featuresadded,"beforefeaturesadded":
beforefeaturesadded},
strategies: [new OpenLayers.Strategy.BBOX({ ratio: 1 }), new
OpenLayers.Strategy.Cluster({ distance: 20 })],
protocol: new OpenLayers.Protocol.HTTP({
url: 'http://193.120.94.23/LPA40DCC/Layers/VectorLayer.aspx?LayerID=LP4_91',
format: new OpenLayers.Format.GeoJSON()}),
projection: new OpenLayers.Projection("EPSG:3857")});
if (oToolTipPreviewLayer != null){
oMapControl.addLayer(oToolTipPreviewLayer);
}
var
oLayerScales=[55168.002,28084.001,14542.0005,7771.0003,4385.5001,2692.7501,846.375];
var oPreviewLayer = new OpenLayers.Layer.WMS('Incidents 2008',
'http://193.120.94.23:8080//cgi-bin/mapserv.exe?map=C:/MS4W/apps/CacheMapConfig/LP4_91WMS.map',
{
scales: oLayerScales, 
layers: ['INCIDENTS'],
format:  'image/png', VERSION: "1.1.1", transparent: true
, projection: new OpenLayers.Projection("EPSG:3857")
},{ isBaseLayer: false
 
, attribution: " \"http://www.IMGS.ie/\" © IMGS 2010 "
, singleTile: true});
 
 
if (oPreviewLayer != null){
oMapControl.addLayer(oPreviewLayer);
}
 


//here I want to set the legend 

function setlegend(slayername) {
     oLayers = oMapControl.getLayersByName(slayername);
for (cnt = 0; cnt < oLayers.length; cnt++) {
 if (oLayers[cnt].CLASS_NAME != "OpenLayers.Layer.WMS") {
alert(oLayers[cnt].features.length); //always coming as zero
//do other stuff here.
 }
}
}

--
View this message in context: http://osgeo-org.1803224.n2.nabble.com/Openlayers-Check-the-map-content-and-tell-if-the-feature-exists-in-the-map-bound-tp6776147p6786648.html
Sent from the OpenLayers Dev mailing list archive at Nabble.com.