(PsychoPy version 2024.2.4) Hello everybody. I have created an experiment on Builder that works seamlessly locally. On Pavlovia, however, one of the loops is not working and I get an undefined variable error message. The stimuli in that loop are drawn from several Excel files dynamically (I had to create different lists for randomization). The randomization code is just before the loops in a routine by itself. The stimuli files are present in the repository and I am pretty sure they are loaded correctly, however I believe something goes wrong because of the code I used. Randomization code in Java: /// Define the list of possible choices var list_choice_B1 = [1, 2, 3, 4]; // Randomly select one value from the list var random_choice_B1 = list_choice_B1[Math.floor(Math.random() * list_choice_B1.length)]; // Declare conditions_file globally var conditions_file = “”; // Ensure it exists before assignment // Assign the correct conditions file based on the chosen value switch (random_choice_B1) { case 1: conditions_file = “list_1.xlsx”; break; case 2: conditions_file = “list_2.xlsx”; break; case 3: conditions_file = “list_3.xlsx”; break; default: conditions_file = “list_4.xlsx”; } // Debugging: Ensure PsychoJS recognizes the file console.log(“Selected conditions file:”, conditions_file); console.log(“Checking resource:”, psychoJS.serverManager.getResource(conditions_file)); // Save the chosen value in experiment data psychoJS.experiment.addData(“conditions_file”, conditions_file); psychoJS.experiment.addData(“chosen_listID_B1”, random_choice_B1); The loop condition is “$conditions_file”, this works fine locally, but I have no idea whether it causes the experiment to crash online.

[image] Wakefield's Daily Tips Blog Use Auto → JS code components wherever possible Even if you aren’t planning to run your experiment online, using an Auto code component will help you spot syntax errors in your Python code. [image] There are some cases where valid Python code comes up as a Syntax error on the JavaScript side but these are rare and, when you encounter then, you can switch to a Both code component and edit or delete the JavaScript side to highlight the fact that they contain code that won’t run online unedited. … [image] Wakefield's Daily Tips Blog Developer Tools If you encounter an error in an online study, open the Developer tools console using Ctl-Shift-I in Windows/Chrome, Cmd-Opt-J or Cmd-Opt-I in Mac/Chrome, F12 in IE/Edge, Ctrl-Shift-J in Windows/Safari or Ctrl-Opt-J in Mac/Safari. [image] [image] Select the Console tab at the top and errors item on the left to view errors. Ignore the 404 error related to favicon.ico Look for the error that appears on the main screen and click on the link next to Scheduler._currentTask. Take… [image] Wakefield's Daily Tips Blog Formatting code in forum posts If you post Python code, the tabs are essential for readability, both by forum users and PsychoPy itself. To maintain the tabs, you need to use preformatted text which you can select from the cog menu. [image] Selecting it on an empty line will give you [image] On a non-empty line you will get [image] You can also manually surround you code with one or three backticks. When posting code, please clarify which tab is comes from: Before experiment, Begin exper… [image] Wakefield's Daily Tips Blog Online errors: unknown resource This is one of the most common errors for experiments which run locally but fail online. In the case of a spreadsheet the name of the spreadsheet is mentioned twice. In the case of an image, you see the name of the image component (ImageStim) and the name of the file (resources). [image] [image] At the start of an online experiment you usually see a download bar for the resources. [image] However, at this stage PsychoPy only downloads files it can identify…

Loop not working on Pavlovia

Online experiments

wakecarter April 22, 2025, 7:49pm 2

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Loop not working on Pavlovia

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