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il presente argomento in inglese descrive in modo semplice come realizzare due menu con possibile selezione multipla

I’m sure that at some point or another you’ve encountered a form widget like the one below, allowing options to be traded from one multi select to another.

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I recently encountered a tutorial over at Quirks Mode on creating such a widget. While not a bad script, when all was said and done it was coming up on 40 lines of JS. I suppose that’s not horrible, but we’re talking about some simple functionality.