You might have to create a hidden question, track the clicks via Javascript and the write it to that hidden question. I don't think this is trackable without Javascript. So I guess you would need a hidden question on every survey page. Let's see what Tpartner has to say about that, as the Javascript expert.
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Provide your LS version and where it is installed (own server, uni/employer, SaaS hosting, etc.).
Always provide a LSS file (not LSQ or LSG).
Note: I answer at this forum in my spare time, I'm not a LimeSurvey GmbH employee.
