Hi Phil
I just want to use a BBOX, so no cql filters. Does the Script protocol know to
return the response to the callback function?
Thanks,
Robert
>>> Phil Scadden <p.scad...@gns.cri.nz> 20/09/2011 4:15 p.m. >>>
yes, I've done it with eg.
Instead of
wfsProtocol = new OpenLayers.Protocol.WFS.v1_1_0({
url: myurl,
geometryName: "SHAPE",
featurePrefix: myfeaturePrefix,
featureType: myfeatureType,
srsName: myproj
});
I use
wfsProtocol = new OpenLayers.Protocol.Script({
url: myurl,
callbackKey: "format_options",
callbackPrefix: "callback:",
params: {
service: "WFS",
version: "1.1.0",
srsName: myproj
request: "GetFeature",
featurePrefix: myfeaturePrefix,
typeName: myfeatureType,
outputFormat: "json"
},
filterToParams: function (filter, params) {
// example to demonstrate BBOX serialization
delete params.cql_filter;
if (filter.type ===
OpenLayers.Filter.Spatial.BBOX) {
params.bbox = filter.value.toArray();
if (filter.projection) {
params.bbox.push(filter.projection.getCode());
}
} else if (filter.type ===
OpenLayers.Filter.Spatial.DWITHIN) {
var geom = filter.value.clone();
transformGeometry(geom);
if (geom.x >= -180 && geom.x <= 360 &&
geom.y >= -180 && geom.y <= 360) { // is this a lat long?
var xx = geom.x;
geom.x = geom.y;
geom.y = xx;
}
params.cql_filter = 'DWITHIN(SHAPE,' +
geom.toString() + ',' + filter.distance + ',meters)';
} else if (filter.type ===
OpenLayers.Filter.Spatial.INTERSECTS) {
var geom = filter.value;
transformGeometry(geom);
geom.components[0].swapXY();
params.cql_filter = 'INTERSECTS(SHAPE,'
+ geom.toString() + ')';
} else if
(OpenLayers.Format.QueryStringFilter) {
var format = new
OpenLayers.Format.QueryStringFilter({
srsInBBOX: this.srsInBBOX
});
params = format.writecql(filter,
params, this.options.url.indexOf('server21') > 0);
}
return params;
}
});
The complicated bit the filterToParams. If you dont have any filter,
then no problem. If you do, they you need to convert the filter to CQL.
The code above handles spatial filters. I havent attempted others. Gets
complicated fast. CQL filters dont respect SRS (at least on geoserver).
You have to make sure that any geometry is transformed to native SRS
(that's what my application function transformGeometry is doing). You
also have switch x,y if it is lat/long.
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