Input a number.
Hi, my experiment is conducted on OSweb. I give each participant a assign subject ID before I sent them the personal experimental link. They are asked to input this number during the experiment. The code I used is shown below:
Generally, it work quite well but with one exception. If the participant do not enter any number and press the "Enter", the experiment still continue and the ID of the participants is not collected.
I wonder if any possible to fix this issue? (e.g., if they do not input any number, then they could not press the “Enter” to continue).