How to collect response time with "Form_Text_Input" and Javascript?

Comments

• sebastiaan

  April 2023

  Hi @Joshua_Gabriel ,

  There are two issues here:

  • This code should be in the Run phase, because that's when the participant actually responds
  • The start time and response time should be attached to the vars object so that they are preserved across scripts and logged. (In OpenSesame 4.0/ OSWeb 2.0, variables will be persistent, but right now they are not yet, see also here.)

  However, OpenSesame also automatically keeps track of timestamps through time_[item name] variables. So you can probably already infer the response time from these! See also here.

  — Sebastiaan

  
  
  Check out SigmundAI.eu for our OpenSesame AI assistant!
  
• Joshua_Gabriel

  April 2023

  Hi @sebastiaan

  Thank you for your reply. I have tried fixing the code per your advice. I have moved the code to the Run phase, and I have tried to attach the start time and response time to the vars object. Here's what I came up with:

  

  I have also put "time_[item name]" variables on the "logger". However, just like before, while it indeed worked while I tested it on Opensesame, it still doesn't work when I uploaded it to JATOS, both the local one and the one on Mindprobe.

  Is it possible that there are some issues when the experiment is converted for JATOS?

  Thank you for your attention.

  Best Regards,

  Joshua
• sebastiaan

  April 2023

  Hi @Joshua_Gabriel ,

  You're using the var keyword to declare a variable. However, you need to use properties of the vars object. Specifically, before the form, you have a script that logs the start time:

  vars.start_time = Date.now()
  

  And after the form you have another script that logs the end time:

  vars.end_time = Date.now()
  vars.response_time = vars.end_time - vars.start_time
  console.log(vars.response_time)
  

  Hope this helps!

  -- Sebastiaan

  
  
  Check out SigmundAI.eu for our OpenSesame AI assistant!
  
• Joshua_Gabriel

  April 2023

  Dear @sebastiaan

  Thank you for your help. I have tried the code you gave me. Unfortunately, like before, while the Javascript was able to detect the response time, the logger didn't log what had been detected by the Javascript.

  To make it clearer, here is a screenshot from when I tested the experiment on Chrome, and inspected the elements:

  

  As it can be seen, the Javascripts were able to detect the time, namely "5588", "7694", and "818714", for the respective "form_text_input" items. However the final results that were recorded by the logger remained to be "null" for all three "form_text_input" items. I think this is unusual, as I have included the "time_[item name]" in the logger, and as can be seen above, the "time_new_inline_javascript" items worked perfectly, while the "time_new_form_text_input" failed to work properly. I have consulted a friend of mine who is experienced in coding, and she too was baffled by it.

  However, since the Javascript could detect the time properly, I am wondering if there is a way to circumvent this problem? For example, could we perhaps directly extract the data from the inline_Javascript items? Or do we have to totally rely on the logger to extract the relevant data?

  If it will help to better illustrate the problem, here is the mock experiment that I have been using in order to solve this issue:

  Test proof.osexp

  Thank you so much for your kind help.

  
  

  Best Regards,

  Joshua
• sebastiaan

  April 2023

  Hi @Joshua_Gabriel ,

  You're storing the response time in a variable called response_time ; however, this variable is not included in the logger . In addition, you're using the same variable (response_time ) three times in a row, but logging it only once at the very end. This means that you will only log the last response time. To fix that, you need to:

  • either use three different variables (response_time1 , response_time2 , response_time3 ) and log them all;
  • or insert a logger after each response.

  Hope that clears things up!

  — Sebastiaan

  
  
  Check out SigmundAI.eu for our OpenSesame AI assistant!
  
• Joshua_Gabriel

  April 2023

  Hi @sebastiaan

  Thank you for your reply. Based on your advices, I have modified my questionnaires, and I believe my problems have been fixed.

  Thank you for your assistance!

  Best Regards,

  Joshua