How to add a redirectParam from within custom hook?

Hello dear forummembers

My question for today is: How to add a redirectParam from within custom hook?

Upon successful form filling I save a new participant for a lecture in a custom hook. On the redirect page the participant can, if wanted, print a confirmation. For that I need the participant id. But since I declare redirectParams on the page before I have no clue how to get that information.

By the way - confirmation via email is no option unfortunately…

Hope you can help me and thanks in advance.

You can add "new" form fields in your custom hook. Use something like this to save your participant id:


On your confirmation page, use FormItRetriever to get your values including your id.