[OpenLayers-Users] Text labels

[Paul Spencer]

Jan, default is a reserved keyword in javascript, you will note in my  
example that it is quoted :)  When specifying the name of object  
properties in object literals, you don't normally have to quote them  
unless the name is a reserved word.

var styleMap = new OpenLayers.StyleMap({
   'default': OpenLayers.Util.applyDefaults({
   })
});

Cheers

Paul

On 2009-10-02, at 8:12 AM, Nicholas Efremov-Kendall wrote:

> Hi all,
>
> First, thanks Paul and Jan for your very helpful emails. I've  
> decided to try to go with Paul's method first, and if I understand  
> correctly this should be it: However I get a parse error on the  
> third line (default: OpenLayers...). I'm not sure what's going on  
> here. Any suggestions?
>
> var styleMap = new OpenLayers.StyleMap(
>                 {
>                  default: OpenLayers.Util.applyDefaults(
>                     {
>                        label: '${Name}',
>                        strokeWidth:1,
>                        strokeColor:"#CCCCCC",
>                        fillColor: "green"
>                     })
>                 }
>             );
>
>             var cities = new OpenLayers.Layer.GML ("7th Century  
> Cities", "data/cities.gml",
>             {
>                 styleMap: styleMap,
>                 projection: new OpenLayers.Projection("EPSG:4326"),
>                 format: OpenLayers.Format.GML
>             }
>             );
>             map.addLayer(cities);
>
> On Tue, Sep 29, 2009 at 3:57 PM, Paul Spencer <pagameba at gmail.com>  
> wrote:
> A simpler styleMap would be to take the Name directly from the  
> feature's attributes, but using a context to provide functions that  
> calculate per-feature styles is very powerful
>
>
> var styleMap = new OpenLayers.StyleMap({
>  default: OpenLayers.Util.applyDefaults({
>    label: '${Name}', // this comes from feature.attributes.Name and  
> is case sensitive
>
>    strokeWidth:1,
>    strokeColor:"#CCCCCC",
>    fillColor: "green"
>  })
> });
>
> Cheers
>
> Paul
>
>
> On 2009-09-29, at 5:28 AM, Jan H. van der Ven wrote:
>
> Dear Nicholas,
>
>
> I use a StyleMap like so:
>
>   var styleMap = new OpenLayers.StyleMap(
>   {
>     "default":OpenLayers.Util.applyDefaults(
>     {
>       fillColor: stateColors[layerIndex],
>       fillOpacity: 0.4,
>       strokeColor: stateColors[layerIndex],
>       strokeWidth: 2,
>       label : "${getName}", // see context below
>       labelAlign: "cm",
>       fontColor: "yellow",
>       fontSize: "12px",
>       fontFamily: "Verdana",
>       fontWeight: "bold"
>     }
>     ,OpenLayers.Feature.Vector.style["default"])
>
> ,"select":OpenLayers.Util.applyDefaults 
> ({},OpenLayers.Feature.Vector.style["select"])
>   });
>   // the labelFunction prevents the modify handles being labeled with
> "undefined"
>   styleMap.styles["default"].context={getName: labelFunction};
>
> This StyleMap is then added as a parameter to the layer:
>   var laag = new OpenLayers.Layer.GML(
>   layerName,
>   url,
>   {
>     format:OpenLayers.Format.GeoJSON,
>     visibility:false,
>     styleMap:styleMap,
>     isBaseLayer:false,
>   });
>
> And the labelFunction is used to show the label only at a certain zoom
> level:
>
>  function labelFunction(feature){
>     if (map.getZoom()>4){
>       if (feature.attributes.name != undefined){
>         return feature.attributes.name;
>       }else{
>         return '';
>       }
>     }else{
>       return '';
>     }
>   }
>
> The part about undefined has to do with edit handles.
>
> Kind regards,
>
>
> Jan
>
> Nicholas Efremov-Kendall wrote:
> Hi all,
>
> Sorry to bug you all with a pretty simple question. I have a shp file
> converted to GML, with an attribute called "name." I'd like for this
> to be places as a label by the polygon feature. I think, based on my
> digging around on the lists that I need a function to first get the
> feature.attributes.Name <http://feature.attributes.Name>, which would
> then pass it to the label. Does anyone have a good example of this, or
> suggestions on implementation?
>
> var cities = new OpenLayers.Layer.GML ("7th Century Cities",
> "data/cities.gml",
> {
> style: {strokeWidth:1, strokeColor:"#CCCCCC", fillColor: "green"},
> projection: new OpenLayers.Projection("EPSG:4326"),
> format: OpenLayers.Format.GML,
>
>             label: "$name",
>
>
> }
> );
> map.addLayer(cities);
>
>
> -- 
> Nicholas Efremov-Kendall
> Fulbright Student 2009-2010, Ukraine
> nefremov at artsci.wustl.edu <mailto:nefremov at artsci.wustl.edu>
> c/o Halyna Yerko
> Balzaka 92a, Kv 27
> 02232
> Kyiv, Ukraine
> (mob) +380963576524
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>
> -- 
> Nicholas Efremov-Kendall
> Fulbright Student 2009-2010, Ukraine
> nefremov at artsci.wustl.edu
> c/o Halyna Yerko
> Balzaka 92a, Kv 27
> 02232
> Kyiv, Ukraine
> (mob) +380963576524