[OpenLayers-Users] Showing points from a database

Fri Sep 19 06:54:36 PDT 2014

using plain text or (geo) json is much less error prone than using
GML, and probably gives better performance

2014-09-19 15:45 GMT+02:00 Niccolò Dal Santo <ncl.dalsanto at gmail.com>:
> Hi there,
>
> I am new of Openlayers and I need to show some points that come from a
> database on a map centred in Turin (Italy), with some information related to
> this point (for instance an image). Searching on line I have found that
> Openlayers supports many formats of data like GML, KML, GeoJSON and many
> others. Could you suggest a format useful fror my problem and maybe some
> examples of how to use it?
>
> I have tried with this code generating a map of europe, but it doesn't work
>
> <html>
> <head>
>   <title>Prova GML</title>
>     <script src="http://openlayers.org/api/OpenLayers.js"></script>
> </head>
>     <body>
>     <div id="ch3_gml" style="width: 100%; height: 100%;"></div>
>
>     <script type="text/javascript">
>
>         // Create the map using the specified DOM element
>         var map = new OpenLayers.Map("ch3_gml");
>
>         var layer = new OpenLayers.Layer.OSM("OpenStreetMap");
>         map.addLayer(layer);
>
>         map.addControl(new OpenLayers.Control.LayerSwitcher());
>         map.setCenter(new OpenLayers.LonLat(0,0), 2);
>
>         map.addLayer(new OpenLayers.Layer.Vector("Europe (GML)", {
>             protocol: new OpenLayers.Protocol.HTTP({
>                 url: "./europe.gml",
>                 format: new OpenLayers.Format.GML()
>             }),
>             strategies: [new OpenLayers.Strategy.Fixed()]
>         }));
>     </script>
> </body>
> </html>
>
> where europe.gml is a gml file in the same folder of this script, but
> nothing happens.
>
> Thank you very much for your help!
>
> Regards
>
> Niccolò
>
> --
> Niccolò Dal Santo
> +39 342 15 70 842
> ncl.dalsanto at gmail.com
>
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