[OpenLayers-Users] Displaying Cluster count and/or certain attributes

[Frederick Löbig]

Thanks a lot! "feature.cluster[i].attributes['name']" helped me and did the trick. I forgot that the cluster actually was an array containing all features and their attributes, so of course, you can call them via their index. 
It's working now!
Cheers,Freddy

Date: Thu, 19 Dec 2013 14:10:08 +0300
Subject: Re: [OpenLayers-Users] Displaying Cluster count and/or certain attributes
From: christian.ledermann at gmail.com
To: frederick.loebig at live.de
CC: openlayers-users at lists.osgeo.org

something along the lines (I just cut and copied some of my code here so you have to modify it for your needs):
                            for (var i=0; i<event.feature.cluster.length; ++i ) {
                                try {                                        message += makeLink(event.feature.cluster[i].attributes['name'],event.feature.cluster[i].attributes['description']);

                                                                   } catch(e) {                                        //                                };                            }


HTH

On Thu, Dec 19, 2013 at 1:27 PM, Frederick Löbig <frederick.loebig at live.de> wrote:




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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Best Regards,


Christian Ledermann

Nairobi - Kenya
Mobile : +254 702978914

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