I want to create multiple subforms.

The first one will define breakpoints and give them a name, e.g. between 0-759 = mobile.

The second subform I want to use an image for that size. So I'd like to be able to have a subform which is able to check the first subform and create a dropdown list of the breakpoints. Ideally even if it isn't saved yet.

  1. Is that possible?
  2. What is the best way to achieve this?

My guess is with a custom form field and a JavaScript listener perhaps?

I would like to understand if there's a different process if we save it, e.g. using PHP instead of JS at that point.

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