[OpenLayers-Users] Make vector layer from JSON

[Eric Lemoine]

On Saturday, March 6, 2010, Hugo <hfpmartins at gmail.com> wrote:
> Hello all,
>
> I'm trying to create a vector layer based on a php query (which includes the_geom) encoded in JSON. Until the moment i haven't been able to achieve this.
> Following, is the relevant part of the code:
>
> var connect = new Ext.data.Connection();
> connect.request({
>     url: 'mfbase/geoquery.php',
>     params: {
>         species: species,
>         datai: datai,
>         dataf: dataf
>     },
>     success: function(response){
>         var resp = response.responseText;
>         var json = new OpenLayers.Format.JSON();
>         var data = json.read(resp);
>         //console.log(data[0].the_geom);
>
>         var querylayer1 = new OpenLayers.Layer.Vector(
>             'Query1',
>             {
>                 isBaseLayer: false,
>                 projection: wgs,
>                 geometryName: 'the_geom',
>             }
>         );
>
>         querylayer1.addFeatures(data);

addFeatures should receive an array of OpenLayers.Feature.Vector objects.

How are geometries encoded in your JSON responses? If they are encoded
as WKT you will also need OpenLayers.Format.WKT.

Have you considered using GeoJSON? Using GeoJSON your client code will
be simpler.

Cheers,

>         map.addLayer(querylayer1);
>     }
> })
> Any suggestions are more than welcomed :)
> Thanks to you all!
>
> Cheers,
>
>
> --
> Hugo Martins
> FMV-UTL
> CIISA-Epidemiologia e Saúde Pública Veterinária
> Av. da Universidade Técnica
> 1300-477 Lisboa
> N 38°42'49.54", W 9°11'43.42"
>

-- 
Eric Lemoine

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