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TypeError: i is undefined; OSWeb

Hi everyone,

i have some problems with the OSWeb extension for opensesame and i was wondering if someone could help me with that.

So basically i designed an experiment as a choice-reaction task (based on the Flanker Task) and added some questions (like: What's your subject-Code, Did you like the task?, Do you want to continue? etc.) that should be answered with different characters (letters or numbers).

I used the code posted by @sebastiaan (posted on March 18 for example) to visualise every question.

Now when i start the experiment in the OSWeb extension, i get the error message:

TypeError: i is undefined.

A quick look at the console showed another error:

Script parsing error: unexpected character ' '.

I assume that it has something to do with the (definition of) different variables used in the experiment but i can't figure it out. I don't even understand what is meant by "i is undefined" as i am not aware of a variable named like that.

I attached the screenshots of the errors below. I used Firefox, but also tried with Opera. I then got the error message: Uncaught Type Error: Cannot read property '0' of undefined.

I am very thankful for any advice!




  • edited April 2020

    Hi @ChrisM

    With errors like these, it helps to also mention what browser you used, and what the version of osweb was. This can be found in the osweb extension in OpenSesame.

    [EDIT]. sorry you mentioned the browser... Does this error occur with all experiments you try to run in osweb, of only the one you implemented?

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  • Hey Daniel,

    thanks for your reply!

    Actually i just solved the problem with the Error: i is undefined. I did this simply by rebuilding my experiment. Unluckily i couldn't trace back the error or the component that produced it...

    To your question: No, it didn't occur with all the experiments i tried.

    Concerning the other error (Script parsing error: unexpected character ' ') - this one still occurs, even though it doesn't affect the experiment, as i am able to run the experiment successfully on OSWeb. Of course, the error can be seen in the console, and when running on JATOS, the server tells me that errors occurred during the experiment.

    I also implemented a different character input syntax and then the error disappeared, so i think it is because of the definition of the variables as ' ' in the code, but i am still not sure and I don't know how to fix it.

    I am using the os-web version 1.3.3.



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