Hmm, loading lots of layers by geoJSON is slow. Do you have a reason not
to use WMS instead?
To your problem - in my app, the whole map configuration is read from a
json config file so same code support many applications. In the config
file, for each layer I am loading, I also store metadata on attributes
and how I want them displayed. The popup creation combine that config
information with attribute information.
This gives you a lot of control, but an alternative approach if you are
using geoserver is freemarker templates and construct those popups
serverside. This is a lot faster.
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