[OpenLayers-Users] how to initialize 'WFS.fromWMSLayer' with features

[John Pulles]

Eric Lemoine schreef:
>> Like the example at
>> http://openlayers.org/dev/examples/getfeature-wfs.html, I am using the
>> OpenLayers.Protocol.WFS.fromWSMLayer convenience function to select
>> features from a wms layer and collect the values of a certain attribute.
>> When opening the same map a next time, I would like to show which
>> features were selected. Now I'm looking for a way to add features to the
>> wfs layer based on some attribute values, what would be the easiest way?
>>
>>
>> you can register a "beforefeatureadded" listener on the vector layer,
>> something like that:
>>
>> layer.events.on({
>>     beforefeatureadded: function(e) {
>>         // only add features whose foo attribute
>>         // is set to "bar"
>>         return e.feature.attributes.foo == "bar" ?
>>              true : false;
>>     }
>> });
>>
>>
>> Hi Eric,
>>
>> What I would like is to fill the vector layer at initialization with the
>> known features from the associated wfs layer. The beforefeatureadded event
>> would still require the user to select features and then only adds the known
>> features. But how to fill the vector layer with these features, without any
>> action from the user?
>>     
>
> I don't get it. beforefeatureadded is triggered for every feature
> added to the layer, it has nothing to do with the user selecting
> features, hasn't it?
>   
But where (or when) do the features come from? The 
OpenLayers.Protocol.WFS.fromWSMLayer function doesn't automatically 
fetch features from the wfs layer, but only in response to a click 
event. I would like it to automatically fetch (some) features at startup 
but don't know how.

John.

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