How can I save keypress duration in online experiments?

Online experiments
2

Do you want the routine to end when the space bar is released?

It would be quite easy to add a code component to do this. Off the top of my head something like:

Begin Routine

spacePressed=0

Each Frame

keys = event.getKeys()

if len(keys):
     if "space" in keys and spacePressed = 0:
          spacePressed = t
elif spacePressed > 0:
     rt = round((t-spacePressed)*1000)
     thisExp.addData('SpaceDur',rt)
     continueRoutine=False

Make sure you add a code_JS component as per my crib sheet.

Best wishes,

Wakefield