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I have a problem with a web map generated via qgis2web plugin using clusters. I have a batch point data and many of these are on the same location. Because of that I have used cluster for representing the locations. The problem is that when I click on the cluster and got the tree with points at the end and after that click on specific point on of these points doesent showing the popup window (if I have 4 points, one of these is always bad, the popup windows does not appear). enter image description here Marked point on the screenshot is that point with popup error. I have tried to change cluster circle radius in css folder but I have not found the code part for it.

How do I solve this problem?

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This is a known issue between qgis2web and Leaflet.markercluster: https://github.com/tomchadwin/qgis2web/issues/505

There is an "easy" workaround: https://github.com/Leaflet/Leaflet.markercluster/issues/431

The idea is to specify spiderfyDistanceMultiplier option when instantiating the L.markerClusterGroup, but this requires that you can pass options to that factory.

In the case of qgis2web, I am not sure you can specify such options unfortunately.

If you can customize the JavaScript, you could however tweak Leaflet.markercluster plugin so that it uses a different spiderfyDistanceMultiplier option value by default:

// Increase spiderfyDistanceMultiplier by default
// in order to force spiderfied Circle Markers to extend outside
// the cluster icon, and be clickable (so that user can open the popup if any).
L.MarkerClusterGroup.mergeOptions({
  spiderfyDistanceMultiplier: 2
});

Place this code in a <script> tag after Leaflet.markercluster script. It should work even if it is executed after qgis2web JavaScript code.

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  • Would it be appropriate to set this value by default in qgis2web? – Tom Chadwin Oct 25 '17 at 18:37
  • @TomChadwin Thanks for caring about this issue! That might help in case qgis2web always uses Circle Marker type (instead of icon-based marker), but only for small clusters. If there are more than a couple markers, the spiderfication might become enourmous… If I understand correctly, qgis2web does not provide a lot of options for customization, hence the need to choose carefully a default value? Maybe we could improve on Leaflet.markercluster side as well. – ghybs Oct 25 '17 at 18:43
  • It's probably a little more complex. I'll pick the discussion up on github.com/tomchadwin/qgis2web/issues/505. – Tom Chadwin Oct 26 '17 at 11:27
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Using the information provided by @ghybs, a possible fix for this issue is now in qgis2web 2.31.0. Please try that and see whether is solves the issue you are having. It adds the option spiderfyDistanceMultiplier: 2 to clustered layers.

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