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Creating notification message for participants

Hi all,

In my experiment participants are asked to input probability values into dialogue boxes. The values have to add up to a 100, but I don’t want to state this explicitly before they try to input some values, but only when their inputs don’t add up to a 100.

  • Is it possible to create a notification/error message which will only appear when participants’ input values into dialogue box don’t add up to a 100?

  • Is it possible to leave the background as it is, but only add the error message above the currently appearing dialogue box?

I don’t quite understand how to refer to and check the inputs in dialogue boxes…

I would really appreciate any help with this!
Alina