Variables empty in online script (looping over dictionaries)

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Okay, I got it to work! Thank you @dvbridges!

To summarize: use the TrialHandler to import the stimuli. This will need to be edited separately in python and JS; if you are in builder, it is easiest to use a python-only code component and a js-only code component.

You can see a working example here:
https://pavlovia.org/run/Aisa2/dictimport_test/html/

And the code here:

In the python code, the import looks like:

testfile = './html/resources/somefile.csv'
varNames = ['col1','col2','col3','etc']; # names of column headers in original file: this is optional, I think.
stimData = data.TrialHandler2(trialList= data.importConditions(testfile), nReps = 10, method='sequential', extraInfo= expInfo)

In the JS code, it looks like:

testfile = 'somefile.csv'
varNames = ["col1", "col2", "col3", "etc"];
stimData = new TrialHandler({
    psychoJS: psychoJS,
    nReps: 1, method: TrialHandler.Method.SEQUENTIAL,
    extraInfo: expInfo, originPath: undefined,
    trialList: testfile,
    seed: undefined, name: 'stimData'
});

Then you access the file in a row/column fashion, like

stimData[0]['myColumnHeader']

Other notes from @dvbridges on the JS end:

// If you want to create two arrays for two types of condition, 
// you can filter the list of objects based on a variable in conditions file 
// e.g., column labelled "condition" for condition 0 and condition 1
cond0 = stimData.filter((trial) => trial['condition']==0)
cond1 = stimData.filter((trial) => trial['condition']==1) 

// Now you can choose to shuffle your new arrays, or leave them sequential
util.shuffle(cond0)

Bonus note: if you want to select different slices of your newly-imported stimulus set, you will also need to do this in python/JS separately, using [start:end] in python and .slice(start, end) in JS.