[OpenLayers-Users] Attributes of WFS features

[Robert Sanson]

Further to this, I have removed the featureClass parameter, and included extractAttributes: true:
 
var wfs = new OpenLayers.Layer.WFS("API WFS", 
          "http://10.65.192.1/cgi-bin/apiwfs.exe?",
          {typename: 'apiaries_dev', maxfeatures: 100, extractAttributes: true},
          {scales: [150000, 10]});
                map.addLayers([wms1,wfs]);
 
I have added:
 
var options = {
                    hover: true,
                    onSelect: function(feature) { 
                    OpenLayers.Util.getElement('apiary').innerHTML = feature.attributes.apiary_id; 
                    }
 
                };
                var select = new OpenLayers.Control.SelectFeature(wfs, options);
                map.addControl(select);
                //select.handler.stopDown = false;
                //select.handler.stopUp = false;
                select.activate();
 
This allows me to hover over each point and select it, however I am struggling to get at the attributes still. Here is a sample of the GML returned by Mapserver:
 

 <gml:Point srsName="EPSG:2193">
<gml:coordinates>1824867.377072,5534693.953457</gml:coordinates>
</gml:Point>
</ms:msGeometry>
<ms:apiary_id>88883</ms:apiary_id>
<ms:x_nzmg>2734900</ms:x_nzmg>
<ms:y_nzmg>6096500</ms:y_nzmg>
<ms:beekeeper_reg_no>H0733</ms:beekeeper_reg_no>
<ms:maf_id>7</ms:maf_id>
</ms:apiaries_dev>
</gml:featureMember>
</wfs:FeatureCollection>
 
There are 5 attributes: apiary_id, x_nzmg, y_nzmg, beekeeper_reg_no, maf_id
 
However, the onSelect function above returns "undefined" into the apiary div.
 
How should I reference the attribute fields in each feature?
 
Many thanks,
 
Robert Sanson
 

>>> "Robert Sanson" <SansonR at asurequality.com> 21/05/2008 10:07 a.m. >>>

I have a n OpenLayers map that displays point markers for a WFS layer served from Mapserver. The source data is an OGR Virtual layer reading froma table in a SQL-server database with x,y fields in a table.
 
Here is the OL snippet that adds the layer:
 
var wfs = new OpenLayers.Layer.WFS("API WFS", 
          "http://10.65.192.1/cgi-bin/apiwfs.exe?",
          {typename: 'apiaries_dev', maxfeatures: 100},
          {scales: [150000, 10], featureClass: OpenLayers.Feature.WFS});
                map.addLayers([wms1,wfs]);
                map.setBaseLayer(wms1);
 
The layer displays fine on top of a base WMS layer.
 
I want to be able to select a single marker using a CTRL-click, and send the attributes to a div below the map. Next I want to be able to capture a new location for the marker using ALT-click, and send the map coordinates to a separate div. From there, I will formulate a POST to a server to update the location in the source table.
 
The code for capturing the coordinates is as follows:
 
//add various map controls
                var control = new OpenLayers.Control();
                OpenLayers.Util.extend(control, {
                    draw: function () {
                    // this Handler.Point will intercept the ctrl-mousedown
                    // before Control.MouseDefault gets to see it
                        this.point = new OpenLayers.Handler.Point( control,
                            {"done": this.notice},
                            {keyMask: OpenLayers.Handler.MOD_ALT});
                        this.point.activate();
                    },
 
                    notice: function (bounds) {
                        document.getElementById('apiary').innerHTML = bounds;
                    }
                });
                map.addControl(control);
 
This works.
 
However, I have no idea as to how to select and then get at the attributes of the WFS layer. Any help appreciated.
 
Many thanks,
 
Robert Sanson
 
 



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