Hi Oscar,
This is done using XBL, which is a large topic. It doesn't use Java; it
mostly uses web technologies (HTML, JavaScript, CSS), plus some "glue" to
make it work with Orbeon Forms. You can find documentation about this on the
page below, on the pages linked from there. And of course, just let us know
if you have any question or stumble upon any problem.
https://doc.orbeon.com/xforms/xbl
‑Alex
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