Hey list,
I have a question on the OpenLayers Cluster strategy and displaying attributes:
The situation: I have a map loading quite a number of points from a dynamically
generated GML. Currently, I am not using a cluster strategy, but the handling
gets more and more difficult. When I hover the points, I send the
feature.attributes.Name content (Content of the Name attribute in the GML) to a
function for displaying a tooltip. No problem until I want to cluster the
features. I understand, that after clustering, the attribute "Name" doesn't
exist anymore. What I want to do now is, when it is a cluster of more than one
feature, I want to send "Cluster of feature.attributes.count" to my tooltip
function, which is also not a problem, but, if there is only one feature in the
cluster, I want to send the feature.attributes.Name of that feature to the
tooltip function. I hope you understand what I am trying to achieve.
Here are the code fragments I am using at the moment:
--- The layer is generated with the following function (already including the
cluster strategy): ---
...
pointLayer = new OpenLayers.Layer.Vector("Wasserhäuschen", {
strategies: [new OpenLayers.Strategy.Fixed(), new
OpenLayers.Strategy.Cluster()], attribution:"Dateneigentum: <a
href='http://www.linie11.org' target='_blank'>linie11.org</a> <a
href='http://www.l-11.de' target='_blank'><img src='./img/l11_attr.png'
border='0'></a><br><br>", protocol: new OpenLayers.Protocol.HTTP({
url: "./geoData/data.xml.gml", format: new
OpenLayers.Format.GML() }), styleMap: new
OpenLayers.StyleMap({'default':defaultStyle,
'select':selectStyle,
'temporary':tempStyle
},{ context: {
// ... label: function(feature) {
// clustered features count or blank if feature is not a cluster
return feature.cluster ? feature.cluster.count : "";
} // .. }
})});
...
--- EOF ---
--- The code of the hover listener, that sends the data to the function
openToolTip: ---
...
var highlightCtrl = new OpenLayers.Control.SelectFeature(
pointLayer, { hover:
true, highlightOnly: false,
clickout: false, toggle: false,
multiple: false, renderIntent: "select",
overFeature: function(feature) {
console.log('hover out: ' + feature.attributes.count);
openToolTip('Cluster of ' + feature.attributes.count);
}, outFeature:
function(feature) { console.log('hover out:
' + feature.attributes.count);
closeToolTip(); }, }
);
...
--- EOF ---
To my understanding, I somehow need to access the attributes of the feature
selected. But I have absolutely no idea how to do this, and I hope to get a
little help from you guys!
Thanks in advance,Freddy _______________________________________________
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