How to limit vertex drag while editing polygons using Leaflet-Geoman?

Leaflet-Geoman polygon editing: Only dragging vertices

When editing polygons using the Leaflet-Geoman library, midpoints are generated on each edge by default, allowing the user to add new vertices. This article describes how to allow only existing vertices to be dragged and prohibit the addition of new vertices.

Requirement description

In Leaflet-Geoman's polygon editing mode, we want to allow only existing vertices to be dragged, while hiding or disabling the middle points on the edges to prevent users from accidentally adding new vertices.

Implementation method

Leaflet-Geoman provides hideMiddleMarkers option to control the display of intermediate points. By setting this option to true when enabling edit mode, you can hide the middle point, thus achieving the effect of dragging only vertices.

Code Example

 // Assume 'poly' is your Leaflet polygon object poly.enableEdit({ hideMiddleMarkers: true });

Add the above code to your Leaflet map initialization or polygon creation code. poly.enableEdit() method enables editing mode, and hideMiddleMarkers: true parameter ensures that only the original vertices are displayed and allowed to be dragged.

With this setting, when editing a polygon, only the original vertex can be dragged, avoiding the possibility of adding new vertices by mistake, thus meeting the need to only allow dragging of vertices.

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