Hello MapServer community,
I'm using the new UTFGrid [1] feature in MapServer in addition with
Clusters [2] in an OpenLayers mapping application. I'm trying to
implement the following feature: when the user clicks on a single point,
a popup gets shown (this works already) and when he/she clicks on a
clustered feature, then it must show different popup, without any info
about the features inside, nor the extent of the features, but
containing a simple link to invite the user to zoom in more.
So basically, I'm looking for a way for the returned utfgrid data to
know if the clicked element on the map is either: a single feature, a
clustered feature or nothing at all. I thought I was close to a
solution, but it didn't work as I expected. I thought of using the
FeatureCount inside the UTFDATA and then use the value returned to
determine the correct type:
UTFDATA '{"c":[Cluster:FeatureCount]}'
But the utf data only returns 2 values: 1 and 2. It returns 1 when
it's a single feature, else 2 whenever it's a clustered feature
(regardless of the actual real feature count) and it also returns 2 when
the user clicks on no feature at all. I'm not sure if my approach is a
correct one, though...
Does someone have any idea how I could accomplish what I'm trying to
do ? I'm using a trunk version of MapServer I haven't updated for a
couple months.
Many thanks,
Alexandre
[1] http://mapserver.org/development/rfc/ms-rfc-93.html
[2] http://mapserver.org/mapfile/cluster.html
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