Highlight of geometry when using infoclick not working for QGIS Server

[eri-blan]

Describe the bug
When getting a GetFeatureInfo hit on a QGIS Server WMS-layer, the returned feature object/s does not contain any geometry information. Thus, no highlight of the object is shown on the map. The resulting null geometry/ies is likely due to the parameter WITH_GEOMETRY=TRUE not being sent with the request.

See Link to QGIS Server documentation concerning extra parameters

To Reproduce
Steps to reproduce the behavior:

1. Activate a layer that comes from QGIS-server.
2. Use the infoclick tool and click on an object on the map.
3. See that no highlight is shown on the map.
4. If one looks at the response from the server, it can be seen that the geometry is null.

Expected behavior
Highlight should be shown on the map of the selected object's geometry.

Desktop (please complete the following information):

Tested on

• OS: Windows 10
• Browser Chrome

But applicable to any environment.

Additional context
There is also a setting within the QGIS project called "Add geometry to feature response" that needs to be checked in order for the function to possibly work.

[jacobwod]

The fix is ready for testing in develop. As you've mentioned, please ensure that you've enabled the Add geometry to feature response option in the QGIS project. https://docs.qgis.org/3.16/en/docs/server_manual/services.html#wms-withgeometry

[eri-blan]

Great! I tested this out and it seems to work.
I noticed however that the layer projection has to be configured to be the same as the map's projection. If not, there seems be a mismatch and the highlight probably ends up somewhere other than supposed to (i.e. the projection of the layer is assumed to be the same as the map projection). Also, QGIS Server does not provide any projection information within the response, like geoserver seems to do.

[jacobwod]

Thanks, you're absolutely right @eri-blan. I'm looking into this. We could retrieve the feature's projection from the layer's (by assuming that all features in a given layer are in the same projection).

[jacobwod]

Fix pushed to develop, feel free to try it out @eri-blan.

[eri-blan]

Tested, and seems to work 👍

[jacobwod]

Great, closing.