Script protocol looks awfully close to what I want. At the moment, I do
queries on an WFS layer by first creating a protocol object, viz
wfsProtocol = new OpenLayers.Protocol.WFS.v1_1_0({
url: myWFSurl
geometryName: "SHAPE",
featurePrefix: myfeaturePrefix,
featureType: myfeatureType,
srsName: "EPSG:900913"
});
I then do queries by:
wfsProtocol.read({
filter: myFilter,
callback: processWFSQuery,
scope: strategy
});
Of course, this uses ajax and runs into cross-domain issues if I am say
running the html off a memory stick instead of server.
It appears I could instead do something:
protocol: new OpenLayers.Protocol.Script({
url: myWFSurl,
callbackKey: "format_options",
callbackPrefix: "callback:",
params: {
service: "WFS",
version: "1.1.0",
srsName: "EPSG:900913",
request: "GetFeature",
geometryName: "SHAPE",
featurePrefix: myfeaturePrefix,
featureType: myfeatureType,
outputFormat: "json"
},
})
or should featureType be typeName???
Presumably, I can read specifying my callback, just the the wfsprotocol,
however, it gets more interesting with the filter. The filters I use are
a mixed bunch. Mostly spatial like:
filter: new OpenLayers.Filter.Spatial({
type:
OpenLayers.Filter.Spatial.INTERSECTS,
value: e.feature.geometry
}),
or
filter: new
OpenLayers.Filter.Spatial({
type: OpenLayers.Filter.Spatial.DWITHIN,
distance: map.getExtent().getHeight() / 10000000,
distanceUnits: "degree",
value: e.feature.geometry
}),
but also text filters created with logical OR
filter: new
OpenLayers.Filter.Logical({
type:
OpenLayers.Filter.Logical.OR,
filters: filters
}),
I'm a little lost as to how the filtertoParams is supposed to work to
serialise all these. Any tips really appreciated.
Thanks
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