Geospatial Map Widget with Client-Side Validation for django-formset

[TreffN]

Hello everyone,

I would like to propose an extension to the geospatial functionality in django-formset by adding a map field to a form that supports client-side validation. The implementation is already underway, and I hope that the developed solution can eventually be integrated into django-formset.

The approach is to extend the existing LeafletWidget from django-leaflet by adding functionality that enables client-side validation of the geometry drawn on the map. This results in a new widget that can be embedded into Django forms. Its basic behavior is modeled after that of given input fields.

The new widget can also be used within collections and is compatible with geometry fields — as shown in the attached screencast.

You can find the current implementation here:

👉 https://github.com/TreffN/django-formset/tree/GeoWidgets

I would appreciate your feedback on the concept. Do you think this would be a suitable candidate for inclusion in django-formset?

Best regards,

Noémie Treff

[jrief]

Sorry for the late reply.

Yes I am very much interested into such a widget and this is on my long term todo list.

I haven't had any time to look at your code yet. The widget I wanted to build myself should be named GeoCollection. In here I want to render the canvas with the tiles. Then as children of that collection, I'd like to have different kinds of geo fields, such as Point, Line, Polygon, MultiPloygon etc. This would allow users to add extra information to each Point or other geographic primitives. It would also allow to add for instance a start- and end-point to such a collection without having to render two canvases.

The implementation should work such that, one can add a GeoCollection to a DialogForm in the Richtext-Editor and then use the Richtext-Editor to add information for each added point.

I also would rather go with OpenLayers instead of Leaflet. Many years ago I implemented a MultiPloygon editor based on Leaflet, but my experience was not very satisfying.

If you want, we can schedule a Google Meet in order to chat about this feature.

Many thanks for your effort.

[armin11]

Hello Jacob,
we are the client, who commissioned the development of the module.
We are developing a bigger django application (https://github.com/mrmap-community/mrmap) and had some problems with dynamic formsets.
Therefor - some years ago - we decided to switch to drf with usage of json-api as an standardized interface. The new frontend has been
developed with react-admin and directly communicates with the json-api after parsing the schema.
Beside mrmap, we develop some further django applications which are used to manage models with spatial fields. Normally django-leaflet is
sufficient to edit the geometries of these fields (one model with one multigeometry field). But in future we want to have a simple possibility to create formsets dynamically for related models with spatial fields.
It would be nice, if you can schedule a Google Meet - or I may start an jitsi session.
Best regards ;-) .