Psychopy to Javascript code

Online experiments
2

I’ve used the following in a free recall task.

if cursorCounter >= 30:
    if cursorVariable=='|':
        cursorVariable='.'
    else:
        cursorVariable='|'
    cursorCounter=0
cursorCounter+=1

if subject_response_finished:
    continueRoutine=False
    
keys = event.getKeys()
if len(keys):
    if 'escape' in keys:
        core.quit()
    elif 'backspace' in keys:
        if len(recallitems[thisitem])>0:
            recallitems[thisitem] = recallitems[thisitem][:-1]
        else:
            recallitems[thisitem-1]=recallitems[thisitem-1]+recallitems[thisitem]
            for Idx in range(thisitem,6):
                recallitems[Idx] = recallitems[Idx+1]
            recallitems[6]=''
            thisitem=thisitem-1
    elif 'delete' in keys:
        recallitems[thisitem] = recallitems[thisitem][:-1]
    elif 'space' in keys:
        subject_response_finished=True
    elif 'return' in keys and thisitem<6:
        thisitem=thisitem+1
        for Idx in range(6,thisitem,-1):
            recallitems[Idx] = recallitems[Idx-1]
        recallitems[thisitem] = ''
    elif 'up' in keys and thisitem>0:
        thisitem=thisitem-1
    elif 'down' in keys and thisitem<6:
        thisitem=thisitem+1
    elif 'a' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'A'
    elif 'b' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'B'
    elif 'c' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'C'
    elif 'd' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'D'
    elif 'e' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'E'
    elif 'f' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'F'
    elif 'g' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'G'
    elif 'h' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'H'
    elif 'i' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'I'
    elif 'j' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'J'
    elif 'k' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'K'
    elif 'l' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'L'
    elif 'm' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'M'
    elif 'n' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'N'
    elif 'o' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'O'
    elif 'p' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'P'
    elif 'q' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'Q'
    elif 'r' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'R'
    elif 's' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'S'
    elif 't' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'T'
    elif 'u' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'U'
    elif 'v' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'V'
    elif 'w' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'W'
    elif 'x' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'X'
    elif 'y' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'Y'
    elif 'z' in keys:
        recallitems[thisitem] = recallitems[thisitem]+'Z'
    else:
        pass

newText=''
for Idx in range(7):
    if numberText==1:
        newText = newText+str(nWords-6+Idx)+') '
    newText = newText+recallitems[Idx]
    if Idx == thisitem:
        newText = newText+cursorVariable
    newText = newText + '\n'
newText=newText + '______________'
if newText != displayText:
    displayText=newText
    recall_text.setText(displayText)