Yes ! It's working :) Thanks for your reply !!!
Can you explain or show me some example with 'rules' ? That will probably reduce the size of my json and I'll learn something new too ;) Thanks! :) -Pol D.- http://www.google.com/profiles/110003197662276240659 On Tue, Mar 23, 2010 at 23:24, Tim Schaub <[email protected]> wrote: > Pol wrote: > > Hello, > > > > I just discovered GeoExt and OpenLayers 2 days ago and I'm rebuilding my > > project using GeoExt (it was using the very good GmapPanel before). > > First of all, thanks for it, it's a very good job ! > > > > Thanks. Welcome. > > > I subscribe to this list because I have a small problem. > > > > I have a single URL who return me all the markers to display on the map. > > Those markers must have different icons. > > > > I don't want to create multiple layers for each kind of markers, that > would > > make too much external calls and slow down the whole stuff. > > > > I have pasted some bits of code here: http://pastebin.com/Uee7xdzJ > > > > I suppose that I have to add a property like: > > > > imgRef: 1 > > > > in my json response to identify the picture to display in javascript > later, > > but I don't know where to put it and how to retrieve it. > > > > Can you help me ? > > Your vector layer will contain a collection of vector features. > OpenLayers.Feature.Vector objects have an "attributes" property. You'll > need to have a feature attribute that can be used to derive the path to > the image you'd like to use for rendering those features. > > In the simplest case, your features have an attribute whose value is the > path to an external graphic. In this case, you will be using a > symbolizer that refers to the appropriate feature attribute. > > e.g. > > // assuming feature.attributes.icon = "path/to/marker.png" > var symbolizer = { > graphicHeight: 10, > graphicWidth: 5, > externalGraphic: "${icon}" > }; > > This symbolizer is used to create an OpenLayers.Style object that is > referenced in an OpenLayers.StyleMap (yes, complicated). > > See http://openlayers.org/dev/examples/styles-rotation.html for a > similar example using feature attribute values for rotation and fill > opacity. > > It looks like you are using GeoJSON as your transport format. Your > OpenLayers feature object would look something like the following when > serialized: > > { > "type": "Feature", > "geometry": { > "type": "Point", > "coordinates": [4.22, 50.72] > }, > "properties": { > "icon": "path/to/marker.png" > } > } > > The "properties" member of a GeoJSON feature object maps to the > attributes object of an OpenLayers vector feature. > > If you don't want to include the path to your external graphic in your > data, but instead you want to render your features based on some other > combination of attributes, you can use rule based styling. Write back > if that's what you're after. > > And, you might find the OpenLayers lists a more appropriate place for > pure OpenLayers questions. > > Good luck, > Tim > > > > > > Thanks. > > > > -Pol D.- > > > > > > > > ------------------------------------------------------------------------ > > > > _______________________________________________ > > Users mailing list > > [email protected] > > http://www.geoext.org/cgi-bin/mailman/listinfo/users > > > -- > Tim Schaub > OpenGeo - http://opengeo.org > Expert service straight from the developers. > _______________________________________________ > Users mailing list > [email protected] > http://www.geoext.org/cgi-bin/mailman/listinfo/users >
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