[OpenLayers-Users] Problems subclassing OpenLayers.Format.GeoRSS

[christopher.schmidt at nokia.com]

On Aug 14, 2010, at 2:32 PM, ext Nick Whitelegg wrote:

> Hello,
> 
> I'm trying to subclass OpenLayers.Format.GeoRSS; this is because I want to extract additional information from a GeoRSS feed that is not parsed with OpenLayers.Format.GeoRSS, such as geo:dir.
> 
> As can be seen, for the moment the overridden createFeatureFromItem() simply displays an alert box with the feature title. This works correctly - the title is displayed - but the items are not added to the vector layer (code as below, the code below works correctly when I just use a straight OpenLayers.Format.GeoRSS()):
> 
>  georss = new OpenLayers.Layer.Vector
>                    ("OTV Panoramas",
>                        { strategies: [new OpenLayers.Strategy.BBOX()],
>                        protocol: new OpenLayers.Protocol.HTTP 
>                            ({ url: "/otv/rss.php",
>                              format: new OpenLayers.Format.GeoRSSExt() }),
>                          'styleMap' : sm,
>                          'projection': wgs84
>                         } );
> 
> The specific error I get is "features[i] not defined" in line 1698 of the current release version (2.9) of OpenLayers.js.
> 
> Any ideas what I'm doing wrong here? As far as I can ascertain I am using the correct current way to subclass.

You appear to have ignored the return value of createFeatureFromItem:

     * Returns:
     * {<OpenLayers.Feature.Vector>} A feature representing the item.
     */
    createFeatureFromItem: function(item) {
        var geometry = this.createGeometryFromItem(item);

Perhaps not doing that would be helpful.

-- Chris

> Thanks,
> Nick
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