Thanks, have gone with this. Should have seen that in the manual...
Yes, it works, but I thought there might be a simpler way. And I think people might find it awkward that their input is visibly cleared before the survey proceeds. I like your alternative solution; thanks for you help!
Yes, I also tried the web service option before realising, as @TomG points out, that it doesn't run client side. Just an additional note: the JavaScript solution works even when the IP address is not being saved (because Anonymize Response has been selected in the Survey Options). This is useful if you want to _use_ the IP address in some way (looking up the country would be the obvious example) without storing it.
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