Putting this out there as a proof of concept if it helps anyone. I don't really expect this to be merged but I could see opportunities for eventually expanding options available in the popup via a plugin system. And if anyone wants to point out a better way to accomplish this I'm all ears!
We had a use case that required rendering a View in a marker popup. The tricky part is the popup View needs to be filtered by the same filters as the main leaflet map. We experimented with using https://www.drupal.org/project/views_field_view → to embed the popup View within the main View but this had performance problems. Ideally we wanted to be able to render a View with arbitrary $args via ajax at the time the popup is triggered.
Add a popup option to render a particular View display, with https://www.drupal.org/project/views_filterfield → and a token-replacing argument string to pass the map View's exposed filters to the popup View.
The major downside here is adding a bunch of extra options to the Leaflet style form. The actual popup functionality is pretty clean and borrows methods from the existing the ajax entity popup controller. If the module wanted to expand on this pattern (e.g., I can see a use case for rendering a popup from an arbitrary controller method) it'd be a good idea to create a plugin system and/or make an interface/base class for the ajax controllers.
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Can you refactor the patch for 10.3.x?
Created MR for 10.3.x, please review it.
Thanks!