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How to require a participant ID?

URL of the experiment: https://run.pavlovia.org/arkadiym/pic_rate_a/html

Description of the problem: When the experiment starts and loads the stimuli, there is a participant ID window, in which participants can enter a number. I was wondering if there is a way to require this response? In other words, I am looking for a way to prevent the participants from clicking the “OK” button, until they enter a number.

Hi,

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Thank you for pointing me to this thread!