CODEWITHSUNDEEP
cqlgeoserverarcgis-js-apiwms
JulienRobitaille
JulienRobitaille

Reputation: 99

Check if CQL_FILTER with WMS returns at least one feature

I am using WMS CQL_FILTER option with ArcGIS JS API. The feature works fine, but I would like to know if there is a way to test whether an expression of CQL_FILTER will return at least one feature. Is this possible? I know a CQL_FILTER will filter depending on the expression, but does it return anything?

Thank you for your help! Julien

Upvotes: 0

Views: 512

Answers (1)

cabesuon
cabesuon

Reputation: 5268

I don't think you can achieve that with WMS, that because the result is an image, the map.

If the provider also offers WFS, you can do a simple query to obtain the number of features with a determined filter.

Something like this could do the job,

http://your/server/wfs?request=getfeature&version=1.1&service=wfs&typename=the_namespace:the_featuretype&CQL_FILTER=the_filter&resultType=hits

Should get you something like this as a result,

<?xml version="1.0" encoding="UTF-8"?>
<wfs:FeatureCollection numberOfFeatures="X" ... />

Where, obviously, what you want is numberOfFeatures.

Upvotes: 2

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