How can I modify condition file directly?

Online experiments
1

URL of experiment: https://pavlovia.org/run/AkaiRed/pysst/html/

Description of the problem:

Hi everyone.
I’m trying to make a simple stop-signal task.
Ok, here’s the problem. Participant respond with left or right button.
If the signal sign comes up, I want participant to stop immediately.

캡처3
캡처31277×739 163 KB

This is a part of my code snippet which works pretty nice.
The problem is that I want to replace $corrAns variable only when the signal is true.
I’ve tried null, None, undefiend but nothing works.

캡처4
캡처4960×515 28.2 KB

The code structure works fine in local environment,
so I think it is a web-specific problem.
It’s gonna be a lot of help if anyone can make a comment about this.
Thanks!

P.S. Why not simply add another column in my condition file?
That’s because I need to use code to pseudo-randomize my trials.
(no consecutive signal trials)
If someone can solve this problem more easily, that’s welcoming!

2

I would set the value for the correct answer in the keyboard component as a different variable. In a code component that variable can either be set from the Excel or set to something else.

3

Thanks for the suggestion. But I’m not sure if that’s going to solve my problem. I have to record the rt and response key of non-signal trials too. In that way, I’d have to record the rt and accuracy of signal and non-signal trials seperately. I would leave that as my last option…