Hi all,
I am having a problem integrating my openlayers implementation into my
site..
I have created a map page that needs to display cached WMS tiles(served by
tilecache), this it seems to do fine mostly. What i then need to do is click
on the map, return the Lat/Lon to an Asynch Web Service written in C# which
then launches the manifoldgis interop component to allow me to perform a
search within the geometry on the database. Now the query works,the
webservice works,the page works for most things however i cannot see what i
am doing wrong that my web service is not returning a result object or
rather it is but it's empty !
Here is the openlayers code.
=====================================
<script type="text/javascript">
<!--
var map, layer, x, y, markersLayer;
OpenLayers.IMAGE_RELOAD_ATTEMPTS = 3;
OpenLayers.Util.onImageLoadErrorColor = "transparent";
//Control Click Handler
OpenLayers.Control.Click = OpenLayers.Class(OpenLayers.Control, {
defaultHandlerOptions: {
'single': true,
'double': false,
'pixelTolerance': 0,
'stopSingle': false,
'stopDouble': false
},
initialize: function(options) {
this.handlerOptions = OpenLayers.Util.extend(
{}, this.defaultHandlerOptions
);
OpenLayers.Control.prototype.initialize.apply(
this, arguments
);
this.handler = new OpenLayers.Handler.Click(
this, {
'click': this.trigger
}, this.handlerOptions
);
},
trigger: function(e) {
markerlayer.removeFeatures(markerlayer.features);
//map.removePopup(popup);
var lonlat = map.getLonLatFromViewPortPx(e.xy);
//var proxy =
Service.select_id_centrePoint_Geom_byLatLon(lonlat.lat,lonlat.lon,
onWebServiceCallBack);
var proxy =
Service.select_id_centrePoint_Geom_byLatLon(lonlat.lat,lonlat.lon,onWebServiceCallBack);
//var proxy = Service._Echo(lonlat.toString(),
onWebServiceCallBack);
}
});
function onWebServiceCallBack(result, userContext, methodName)
{
var temp = new Array();
var s = result.toString();
temp = s.split(',');
var cmaID = temp[0];
Lat = temp[1];
Lon = temp[2];
var marker = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Point(Lon, Lat), {
externalGraphic:
"http://localhost/TileCache/Images/marker-gold.png";,
backgroundGraphic: "../Images/marker-gold.png",
backgroundXOffset: 0,
backgroundYOffset: -7,
graphicZIndex: 1100,
backgroundGraphicZIndex: 1000,
pointRadius: 10
});
//markerlayer.addMarker(marker);
markerlayer.addFeatures(marker);
map.addLayer(markerlayer);
var popup = new OpenLayers.Popup("Erf Info", "chickenlicken",
new OpenLayers.Size(200, 600),
"Clicked at:= Longitude :" + Lon +
" \n Latitude :" + Lat , true);
popup.setOpacity(0.7);
map.addPopup(popup);
alert(cmaID);
}
function init() {
var street_OverLay, erven_OverLay
x = 18.43678;
y = -33.9068;
//specify Resolution array - zooms
var options = { resolutions: new Array(0.00001867185,
0.0000093359375, 0.00000466796875, 0.000002333984375, 0.0000011669921875),
'maxExtent': new OpenLayers.Bounds(bbox = 18.13232, -34.39155, 19.01818,
-33.39165), restrictedExtent: new OpenLayers.Bounds(bbox = 18.13232,
-34.39155, 19.01818, -33.39165) };
// set theme:null to enable style editing on the rows
//create a new map object
map = new OpenLayers.Map($('map'), options);
//set overlay
street_OverLay = new OpenLayers.Layer.WMS("Cape Metropolitan
Council",
"tilecache.py?TRANSPARENT=true",
{ layers: "Municipal_Overlay", transparent: "true",
'maxExtent': new OpenLayers.Bounds(18.52, -34.62, 19.28, -33.77), format:
"image/png" }, { alpha: true });
street_OverLay.setZIndex(0);
street_OverLay.setVisibility(true);
street_OverLay.setIsBaseLayer(true);
map.addLayer(street_OverLay);
//create the erven overlay and set it to be invisible
//erven_OverLay = new OpenLayers.Layer.WMS( "Erven Overlay",
// "tilecache.py?TRANSPARENT=true",
// {layers: "Erven_Overlay",transparent: "true", format:
"image/png",minZoomLevel: 0, maxZoomLevel: 1 },{alpha:true});
// erven_OverLay.setZIndex(100);
// erven_OverLay.setVisibility(false);
// /erven_OverLay.setIsBaseLayer(true);
// map.addLayer(erven_OverLay);
//code to add marker layer
markerlayer = new OpenLayers.Layer.Vector(
"Marker Drop Shadows",
{
styleMap: new OpenLayers.StyleMap({
// Set the external graphic and background graphic
images.
externalGraphic:
"http://localhost/TileCache/Images/marker-gold.png";,
backgroundGraphic: "../Images/marker-gold.png",
backgroundXOffset: 0,
backgroundYOffset: -7,
graphicZIndex: 11,
backgroundGraphicZIndex: 10,
pointRadius: 10
}),
isBaseLayer: false,
displayInLayerSwitcher: false,
rendererOptions: { yOrdering: true }
}
);
map.addLayers(markerlayer);
// Add The Control Box(es) to the page
map.addControl(new OpenLayers.Control.LayerSwitcher()); //layer
switching tool
//var options = {div:$('mouseco')};
map.addControl(new OpenLayers.Control.MousePosition()); //
mouse x
and y co-ordinates
//map.removeControl(OpenLayers.Control.PanZoom());
map.removeControl(map.controls[1])
map.addControl(new OpenLayers.Control.PanZoomBar()); //Zoom
Slider
I think
options = { div: $('labs') };
//map.addControl(new OpenLayers.Control.ScaleLine(options)); //
to
give an idea of sacale
map.addControl(new OpenLayers.Control.ScaleLine(options));
//set the base layer this is the primary visible layer
//options = {div: $('powered')};
var click = new OpenLayers.Control.Click();
map.addControl(click);
click.activate();
map.setBaseLayer("Cape Metropolitan Council");
//add the overview map
//map.addControl(new OpenLayers.Control.OverviewMap({layers:
"Municipal_Overlay",isSuitableOverview: function() {return true;}}));
//set the zoom and longlat of startup
map.setCenter(new OpenLayers.LonLat(x, y), 0);
if (!map.getCenter()) map.zoomToMaxExtent();
}
// -->
</script>
=================================
Here is the C# Web Method
=================================
[WebMethod]
public string select_id_centrePoint_Geom_byLatLon(double
Latitude, double Longitude)
{
StringBuilder sb = new StringBuilder();
string s;
MapServer mapServer = new MapServer();
string State = "";
mapServer.Create(Server.MapPath("config.txt"), State, "");
Manifold.Interop.Query q =
(Manifold.Interop.Query)mapServer.Document.ComponentSet["Select_Erf_CentrePoint_and_Cma_ID"];
q.ParameterSet["Lat"].Value = Latitude.ToString();
q.ParameterSet["Lon"].Value = Longitude.ToString();
q.Run();
Manifold.Interop.Table T = q.Table;
foreach (Manifold.Interop.Record r in T.RecordSet)
{
foreach (Manifold.Interop.Column c in T.ColumnSet)
{
sb.Append(r.get_Data(c.Name) + "|");
}
}
s = sb.ToString();
return s;
}
[WebMethod]
public string _Echo(string input)
{
return input;
}
[WebMethod]
public string _WS_Test()
{
return "Hello World";
}
}
and here is the aspx page
=================================
</head>
<body onload="init()">
<form runat="server">
<asp:ScriptManager runat="server" ID="ScriptManager1"
EnablePageMethods="True">
<Services>
<asp:ServiceReference
Path="http://localhost/MapService_Site/Service.asmx"; />
</Services>
</asp:ScriptManager>
</form>
<div id="map">
<div id="chickenlicken" style="position:relative;background-color: red;
color: white; font-size: 120%;left:110px;top:150px"></div>
<div id="labs"><div id="outPutDiv"></div></div>
<div id="powered">Powered By CMAInfo</div>
</div>
</body>
</html>
=========================================================
Really hope that someone will be able to assist me or perhaps provide a
better way. Web services are important in our project though because we need
to be able to offer various online services including mapservices.
Greetings from Cape Town(South Africa)
Sandro
--
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![http://localhost/TileCache/Images/marker-gold.png"](http://localhost/TileCache/Images/marker-gold.png"){kind=link}