Well, basically yes - the aim is to pass respective variable content (e.g. a user ID received through a URL get parameter) and a js fingerprint via URL call to a backend server; in the current case once a participant enters the survey and once he has completed the survey.
We do this with javascript hidden in the text of the first page, and the current solution is to put the second part in the end message textbox that is shown once the participant hits submit.
Basically, I would like to flag participants as "complete" once they enter the last page before hitting submit (since the last page has no mandatory content) and then place the javascript there.
Anyhow, I guess we'll stick to the current solution then.
As I said, the feature to select the conditions (like enter page X) when a participant is flagged as complete would be really great if it were to be added to LS.
Best regards