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

[Christian Ledermann]

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
>
> _______________________________________________
> Users mailing list
> Users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/openlayers-users
>



-- 
Best Regards,

Christian Ledermann

Nairobi - Kenya
Mobile : +254 702978914

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