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Wakefield's Daily Tips

ReferenceError: varName is not defined This is one of the most common errors in online experiments [image] It is also one of the easiest to solve. The issue is one of “scope”. To define a variable so it has scope across your whole experiment, all you have to do is assign it a value. Don’t edit your JavaScript to add “var” or “let” commands. To give your variable scope assign the value in a Begin Experiment code component tab outside any clauses (i.e. no Python indents). [image] I usually s…

Wakefield's Daily Tips

The answer is (almost) never to edit the generated code When you create an experiment in Builder, PsychoPy then generates a Python file which you can use to run the experiment locally and two JavaScript files suitable for running the experiment online (using current and older browsers). If something doesn’t work, there may be a temptation to make edits directly to the Python/JavaScript files rather than the Builder file. However, this is generally a bad idea for two reasons: The process is o…