THANKS!
This solve my problem.
But I would like to specify that I've had to delete the specification of
the WFS protocol version. That means:

 protocol: new OpenLayers.Protocol.WFS({
                url: urlMS_sismi,
                //version: "1.1.0", //ROW COMMENTED TO MADE WORK SORT
FUNCTION
                featureType: "sism_last15",
                featureNS: "http://mapserver.gis.umn.edu/mapserver";,
                extractAttributes: true, extractStyles: true, geometry:
"msGeometry", srsName: "EPSG:32632"
  })


Thanks again to all!

Riccardo


2011/11/4 Hugo <hfpmart...@gmail.com>

> Hi Riccardo,
>
> you can try to sort your data using a the load listener on your store.
> Something like the following:
>
> store_sismi.on('load', function(store){
>  store.sort('magnitudo', 'DESC');
> });
>
> Hope that helps.
> Cheers,
>
> Hugo
>
> On Fri, Nov 4, 2011 at 1:04 PM, Riccardo Gaeta <riccardo...@gmail.com>wrote:
>
>> Thanks Christain, I've tried your tip but it doesn't work for me.
>> I don't know why but GeoExt persist to put my data in ascendent order by
>> the "date" column, without ANY specification about that...I don't really
>> understand.
>>
>> Any other ideas???
>>
>> Thanks to all
>>
>>
>> 2011/11/4 Christian Mayer <ma...@terrestris.de>
>>
>>> **
>>> Hi Riccardo,
>>>
>>> here a code snippet I have in use:
>>>
>>> myStore.setDefaultSort('magnitudo', 'DESC'); // just after instanciating
>>> the store
>>>
>>> Best regards,
>>> Chris
>>>
>>>
>>> Am 02.11.2011 12:16, schrieb Riccardo Gaeta:
>>>
>>> Hi all,
>>> I have a problem: I'm not able to set correctly the sortInfo to have my
>>> data ordered in my GridPanel by a column.
>>> I've spent lot of time by forum but I was not able to find a solution
>>> for me.
>>> I load a WFS layer from MapServer/Postgis, then I like order the data
>>> (like 20-30 records) by date field.
>>> My date field originally come from Postgres "timestamp", but here I
>>> translate it as string.
>>> Anyway I don't know why Ext order my records with this column
>>> "full_date", in ascending order, and I'm not able to reverse this order, or
>>> better change the field to use for order my data (like "magnitudo", that is
>>> a double field).
>>>
>>>  I use Ext 3.4.0, and I try my page on Chrome.
>>>
>>>  Thanks everyone could give me a suggest!!!
>>>
>>>  The code (the commented line are my test:they don't work):
>>>
>>>  var sismi = new OpenLayers.Layer.Vector("Sismicità strumentale -
>>> ultimi 15 giorni", {
>>>  styleMap: styleMap_sismi,
>>>  strategies: [new OpenLayers.Strategy.Fixed()],
>>>  protocol: new OpenLayers.Protocol.WFS({
>>>  url: urlMS_sismi, version: "1.1.0", featureType: "sism_last15",
>>>  featureNS: "http://mapserver.gis.umn.edu/mapserver";,
>>>  extractAttributes: true, extractStyles: true, geometry: "msGeometry",
>>> srsName: "EPSG:32632"
>>>  })
>>>  });
>>> var store_sismi = new GeoExt.data.FeatureStore({
>>>         fields: [
>>>             {name: "latitudine", type: "float"},
>>>             {name: "longitudine", type: "float"},
>>>             {name: "profondita", type: "float"},
>>>             {name: "magnitudo", type: "float", mapping:"magnitudo"},
>>>             {name: "regione_geografica", type: "string"},
>>>             {name: "num_fasi", type: "integer"},
>>>             {name: "max_gap_az", type: "integer"},
>>>             {name: "localita", type: "string"},
>>>             {name: "full_date", type: "string"}
>>>         ],
>>>         layer: sismi
>>>         //, remoteSort: false //to enable sorting from server
>>>         , sortInfo:{"field": 'magnitudo', "direction": "DESC"} //don't
>>> work...
>>>  //, paramOrder:['magnitudo']
>>>  });
>>>  //store_sismi.setDefaultSort('magnitudo', 'DESC');
>>>  //store_sismi.sort('magnitudo', "DESC");
>>>
>>>  gridPanel = new Ext.grid.GridPanel({
>>>                 xtype : 'grid', //a cosa serve?
>>>                 title: "Elenco degli eventi sismici",
>>>                 region: "south",
>>>                 //stripeRows: true,
>>>                 columnLines: true,
>>>                 viewConfig: {forceFit: true},
>>>                 store: store_sismi,
>>>                 loadMask: true, //a cosa serve?
>>>                 height: Math.round(height_map*0.4), //280
>>>                 autoScroll: true,
>>>                 collapsible: true,
>>>                 collapsed: false,
>>>                 //sm: new GeoExt.grid.FeatureSelectionModel(), //per
>>> sincronizzare grid e features
>>>                 cm: new Ext.grid.ColumnModel({
>>>                     defaults: {
>>>                         sortable: true
>>>                     },
>>>  columns: [
>>>                         {header: "<b>Magnitudo [ML]</b>", dataIndex:
>>> "magnitudo", decimalPrecision: 2,
>>>                         align: "center", width: 150},
>>>  {header: "<b>Tempo origine</b>", dataIndex: "full_date", width: 175},
>>>                         {header: "Prof. [km]", dataIndex: "profondita",
>>> decimalPrecision: 2, align: "center"},
>>>                         {header: "Lat", dataIndex: "latitudine",
>>> decimalPrecision: 3, align: "center"},
>>>                         {header: "Lon", dataIndex: "longitudine",
>>> decimalPrecision: 3, align: "center"},
>>>                         {header: "Regione geografica", dataIndex:
>>> "regione_geografica", width: 180},
>>>                         {header: "Localita", dataIndex: "localita",
>>> width: 180},
>>>                         {header: "Nfasi", dataIndex: "num_fasi", align:
>>> "center"},
>>>                         {header: "gap", dataIndex: "max_gap_az", align:
>>> "center"}
>>>                 ]
>>>         })
>>>         //,autoLoad: true //se true anche se il layer non è sulla mappa
>>> viene caricato
>>>     });
>>>
>>>
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>>>
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>>>
>>
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>>
>
>
> --
> Hugo Martins
> LabNT - ISEGI UNL
> Campus de Campolide
> 1070-312 Lisboa
> N 38°43'56.84", W 9°9'35.74"
>
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