Pavlovia Experiment Display Issue

Online experiments jsPsych
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1

Hello,

I am experiencing an issue with component display and Routine-end conditions and would appreciate your support.

The problem involves a JavaScript file that was generated by PsychoPy and then manually corrected. The code runs on Pavlovia without any errors; however, some components are not displaying as expected. Specifically, the screen should show images and sliders, and the routine should be ended after selecting the values from the sliders and validating the choice using a button. However, only the background appears and after a few seconds the experiment ends without any interaction from the user. According to the browser console, the image files are correctly uploaded and loaded, so the issue does not seem to be related to missing resources.

The slider settings in PsychoPy are configured correctly:

  • “Force end of routine” is unchecked

  • The start value is set to null

And these settings are verified in the JavaScript version (both startValue: undefined, and startValue: null, have been tested).

Despite this, it seems the slider is behaving as if a start value is defined and is automatically ending the routine without user interaction.

Besides Pavlovia side issues, the experiment runs correctly in local (on PsychoPy).

Could you please help me identify what might be causing this behavior?

Thank you

2

I could solve the problem by just updating PsychoPy to version 2025.1.1. However I am still wondering why my experiment was not working on PsychoPy 2024.2.4!!

3

Hi Amel,

If the experiment started working after an update, it does sound like you may have encountered a bug in the earlier version.

You mentioned that “The problem involves a JavaScript file that was generated by PsychoPy and then manually corrected.” To better understand the issue, we would need a bit more information about the specific manual changes made to the code. In general, we don’t recommend editing the generated JavaScript directly, as it makes it more challenging for us to distinguish between potential bugs in PsychoPy and issues introduced by manual edits. We can provide the most effective support when experiments are compiled directly from Builder, as this allows us to fully trace and debug the code.

That said, I’m really pleased to hear you were able to get your experiment working, thank you for sharing your solution!

Becca