Alright! I found a workaround using OpenLayers only. I also noticed
that I made a wrong statement earlier. Let me correct.
In the grid, both the non-clustered AND clustered features are
correctly returned. It's in the 'data' object that only the
non-clustered features are returned, which is fine by me.
That being said, we know that the space character is always used to
represent nothing. Knowing that, I added an additional information to
the callback method that normally returns the id of the feature and the
attributes we had defined in the UTFDATA. I added the index of the
character. If it's 0, the user clicked on nothing. If it's anything
else, it's a single feature if the id is set (since it exists in the
data and was correctly returned) else (when there's no id), it's a cluster.
I'm fine with using this solution, but if there was a way to
accomplish that otherwise, i.e. using MapServer settings, please let me
know.
Regards,
Alexandre
On 14-01-24 09:55 AM, Alexandre Dubé wrote:
Hi,
I just noticed that when using Clusters, only the non-clustered
features (singles) are returned in the grid, so clicking on a cluster
is like clicking on nothing. That explains the behavior I get.
I'll continue to look for a solution.
Alexandre
On 14-01-24 09:21 AM, Alexandre Dubé wrote:
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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