Scale not working in online study

URL of experiment:

Description of the problem: I am trying to get a horizontal scale working on Pavlovia.
It works offline in Psychopy, but when I move it online, the experiment immediately terminates (there is no other element but the scale). It seems to ignore my scale element. If I add other elements such as images, these do appear, so the problem is specific for the scale element.

Here is the full code:

#!/usr/bin/env python

-- coding: utf-8 --

This experiment was created using PsychoPy3 Experiment Builder (v3.0.3),
on March 20, 2020, at 09:58
If you publish work using this script please cite the PsychoPy publications:
Peirce, JW (2007) PsychoPy - Psychophysics software in Python.
Journal of Neuroscience Methods, 162(1-2), 8-13.
Peirce, JW (2009) Generating stimuli for neuroscience using PsychoPy.
Frontiers in Neuroinformatics, 2:10. doi: 10.3389/neuro.11.010.2008

from future import absolute_import, division
from psychopy import locale_setup, sound, gui, visual, core, data, event, logging, clock
from psychopy.constants import (NOT_STARTED, STARTED, PLAYING, PAUSED,
import numpy as np # whole numpy lib is available, prepend ‘np.’
from numpy import (sin, cos, tan, log, log10, pi, average,
sqrt, std, deg2rad, rad2deg, linspace, asarray)
from numpy.random import random, randint, normal, shuffle
import os # handy system and path functions
import sys # to get file system encoding

Ensure that relative paths start from the same directory as this script

_thisDir = os.path.dirname(os.path.abspath(file))

Store info about the experiment session

psychopyVersion = ‘3.0.3’
expName = ‘test_scale’ # from the Builder filename that created this script
expInfo = {‘participant’: ‘’, ‘session’: ‘001’}
dlg = gui.DlgFromDict(dictionary=expInfo, title=expName)
if dlg.OK == False:
core.quit() # user pressed cancel
expInfo[‘date’] = data.getDateStr() # add a simple timestamp
expInfo[‘expName’] = expName
expInfo[‘psychopyVersion’] = psychopyVersion

Data file name stem = absolute path + name; later add .psyexp, .csv, .log, etc

filename = thisDir + os.sep + u’data/%s%s_%s’ % (expInfo[‘participant’], expName, expInfo[‘date’])

An ExperimentHandler isn’t essential but helps with data saving

thisExp = data.ExperimentHandler(name=expName, version=’’,
extraInfo=expInfo, runtimeInfo=None,
originPath=‘E:\Python Scripts\test\’,
savePickle=True, saveWideText=True,

save a log file for detail verbose info

logFile = logging.LogFile(filename+’.log’, level=logging.EXP)
logging.console.setLevel(logging.WARNING) # this outputs to the screen, not a file

endExpNow = False # flag for ‘escape’ or other condition => quit the exp

Start Code - component code to be run before the window creation

Setup the Window

win = visual.Window(
size=(1024, 768), fullscr=True, screen=0,
allowGUI=True, allowStencil=False,
monitor=‘testMonitor’, color=[0,0,0], colorSpace=‘rgb’,
blendMode=‘avg’, useFBO=True)

store frame rate of monitor if we can measure it

expInfo[‘frameRate’] = win.getActualFrameRate()
if expInfo[‘frameRate’] != None:
frameDur = 1.0 / round(expInfo[‘frameRate’])
frameDur = 1.0 / 60.0 # could not measure, so guess

Initialize components for Routine “trial”

trialClock = core.Clock()
rating = visual.RatingScale(win=win, name=‘rating’, marker=‘triangle’, size=1.0, pos=[0.0, -0.4], low=0, high=100, labels=[‘Completely not me’, ’ Completely me’], scale=’’, singleClick=True, showAccept=False)

Create some handy timers

globalClock = core.Clock() # to track the time since experiment started
routineTimer = core.CountdownTimer() # to track time remaining of each (non-slip) routine

------Prepare to start Routine “trial”-------

t = 0
trialClock.reset() # clock
frameN = -1
continueRoutine = True

update component parameters for each repeat


keep track of which components have finished

trialComponents = [rating]
for thisComponent in trialComponents:
if hasattr(thisComponent, ‘status’):
thisComponent.status = NOT_STARTED

-------Start Routine “trial”-------

while continueRoutine:
# get current time
t = trialClock.getTime()
frameN = frameN + 1 # number of completed frames (so 0 is the first frame)
# update/draw components on each frame
# rating updates
if t >= 0.0 and rating.status == NOT_STARTED:
# keep track of start time/frame for later
rating.tStart = t
rating.frameNStart = frameN # exact frame index
continueRoutine &= rating.noResponse # a response ends the trial

# check for quit (typically the Esc key)
if endExpNow or event.getKeys(keyList=["escape"]):

# check if all components have finished
if not continueRoutine:  # a component has requested a forced-end of Routine
continueRoutine = False  # will revert to True if at least one component still running
for thisComponent in trialComponents:
    if hasattr(thisComponent, "status") and thisComponent.status != FINISHED:
        continueRoutine = True
        break  # at least one component has not yet finished

# refresh the screen
if continueRoutine:  # don't flip if this routine is over or we'll get a blank screen

-------Ending Routine “trial”-------

for thisComponent in trialComponents:
if hasattr(thisComponent, “setAutoDraw”):

store data for thisExp (ExperimentHandler)

thisExp.addData(‘rating.response’, rating.getRating())
thisExp.addData(‘rating.rt’, rating.getRT())

the Routine “trial” was not non-slip safe, so reset the non-slip timer


these shouldn’t be strictly necessary (should auto-save)


make sure everything is closed down

thisExp.abort() # or data files will save again on exit

See here: RatingScale in online experiments

The rating scale object has not been implemented in online experiments, unfortunately. Try “slider”.