Crucco

I’m getting closer to the solution. I’m using Material Design for Bootstrap as a Framework. In their min.css I found the declaration “select {display: none!important}”. Deactivating it in Chrome Developer Tools brings the select fields up and they are working. So it’s a CSS thing. Got to understand if it’s bootstrap or MDB that does it – and why. But there will be a solution.
Thank you very much!

I tried the leaflet plugin you mentioned and it works. For shure, being able to implement GPX-data would be nice, since converting GPX to GeoJson requires additional GIS-Software (QGIS is opensource, though) and an additional step.

On the other hand, leaflet gives native support for GeoJson Layers without having to implement plugins.

Couldn’t this be an attempt? New layer, upload GeoJson, and the line is on the map.

No idea of programming wordpress plugins. But in Leaflet, that’s a line of code …

You’re doing well releasing new versions when they work, so take your time.

For more precision: I wouldn’t ever want to plug my GPS-device to mapsmarker and post the tracks directly. Neither would I need the possibility to do it from the frontend. (Even if this would give great possibilities to collect data from a usergroup ??

I would be happy if it was possible to convert a GPS-Track in GeoJson (or KML or whatever) and to put it as a new layer on the map … is that this difficult to realize?