You can get them as raster via WMS (if you have a web map service...), or as
vector features via OpenLayers.Layer.Vector or OpenLayers.Layer.WFS.
I used to get the PNG raster of my shapefile like this (I have GeoServer as
WMS):
var myShapeFile = new OpenLayers.Layer.WMS('Name',
WMSURL,
{layers: WORKSPACE + ':' + ,
transparent: 'true', // Visualize all rasters
at the same time
opaque: 1,
format: 'image/png8'},
{opacity: 0.4, singleTile: true,
transitionEffect: 'resize'}
);
OLmap.addLayer(myShapeFile);
Take a look at the examples code, it may be useful (e.g.
http://openlayers.org/dev/examples/wfs-protocol-transactions.html)
Piero
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