Hello all,
I'd like to override the handleRead function in OpenLayers.Protocol.WFS.v1
for our application. I'd like to check what the maxFeatures value (if it was
passed as an option) is and compare it with the number of features returned
because, ultimately, I'd like to be able to tell the user they have reached
this maximum and the features they are seeing in the map are not necessarily
all the features that exist within the BBOX they specified in a GetFeature
process.
We will not alter third-party code directly and therefore I need to override
that function from within our own application's javascript. I've done
something similar before and it's worked fine, but for some reason I can't
get it to work for this particular class definition and I believe it is
because this one is an abstract class.
I have created a file within our application structure that I load after the
OpenLayers library has been loaded but before I actually use the
functionality anywhere in our application. The file's contents are as
follows:
debugger;
OpenLayers.Util.extend(OpenLayers.Protocol.WFS.v1.prototype, {
somevariable: null,
handleRead: function(response, options) {
alert("am i here?"); // TODO: check options.maxFeatures compared to
response.features
if(options.callback) {
var request = response.priv;
if(request.status >= 200 && request.status < 300) {
// success
response.features = this.parseFeatures(request);
response.code = OpenLayers.Protocol.Response.SUCCESS;
} else {
// failure
response.code = OpenLayers.Protocol.Response.FAILURE;
}
options.callback.call(options.scope, response);
};
}
});
I know that the file is being loaded on startup because the debugger at the
top is hit and when I step over the extend call, the
OpenLayers.Protocol.WFS.v1.prototype has the "somevariable" added to it
(just so I could verify the code was running). However, when the
OpenLayers.Protocol.WFS function actually instantiates a new WFS protocol on
which that abstract class is built, the "somevariable" is not in there and
it certainly doesn't use my handleRead function. Again, I'm assuming (and
please correct me if I'm wrong) that the reason this isn't working is
because the prototypes for v1_0_0 and v1_1_0 have already been created when
OpenLayers was loaded and my changing the abstract class on which they were
built isn't affecting those prototypes at all.
If this is the case, and really even if it isn't the case and it's some
other problem I'm encountering, can someone suggest to me how I need to go
about this to get the result I am looking for? After loading my above code,
do I have to somehow reload the contents of the
OpenLayers/Protocol/WFS/v1_0_0.js and v1_1_0.js somehow? Something else
entirely?
Can anyone point me in the right direction here?
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