How to add my own config items and how read them in code ?

[dingbo8128]

I'd like to add a config item say data_root_dir to save application data, how to add it to .kobweb/conf.yaml, and how to read it from my code.

[bitspittle]

I'm not really sure exactly what you're trying to do. Can you explain the problem more clearly?

In general, if you want to pass in information to your frontend at compile time from gradle, you do this: https://kobweb.varabyte.com/docs/concepts/foundation/application-globals (but I don't get the feeling that is what you're asking for)

.kobweb/conf.yaml is really more configuration for your backend than your frontend. But if you want to configure your backend with custom values, it's usually enough to use an @InitApi block: https://kobweb.varabyte.com/docs/concepts/server/fullstack#initapi-methods-and-initializing-services

And if you want to allow users to pick a file which you save to their local storage, then you should read https://kobweb.varabyte.com/docs/concepts/foundation/persisting-state#web-storage

But again, it's not clear to me what you're actually trying to do so I'm not sure which piece of advice is relevant here, if any.