[open] getting keyboard_response to accept double digit responses

martin

as the title says, i'm trying to get the keyboard_response function to accept 2 digits rather than skipping forward after a single key press. Probably not a complex question... any advice?

Edwin

This is generally not something you can do with a keyboard response (unless you put two of them directly after eachother, but I have the feeling this is not what you would want). You can do two things:

1) Use the form_text_input plugin, which allows users to type their response in.

2) Use a bit of inline scripting, like the snippet below (replace your keyboard_response with an inline_script and put the code in its Run Phase to test it).

# first, we import the classes that we need for our script
from openexp.canvas import canvas
from openexp.keyboard import keyboard

# then, we use these classes to create objects that we
# are going to use in our script: first the canvas object,
# which we will use to display stuff on the screen
my_canvas = canvas(exp)
# second the keyboard object, which we will use to
# register keypresses
my_keyboard = keyboard(exp)

# now, we will need to pre-define some stuff; in this case
# we will need the allowed numbers:
numbers = ['0','1','2','3','4','5','6','7','8','9']
# and an empty string, in which we are going to store the
# response that was given by the participant
numstring = ''
# also, we will need to define the maximal amount of
# numbers that can be put in
maxlength = 2

# now, before we start, let's clear the display and get the
# starting time (useful for calculating the RT later on!)
my_canvas.clear()
t0 = my_canvas.show()

# now, we are going to make sure the display stays on
# until the participant presses the space button; we will
# do so using a while loop, which runs until the 'sentry
# variable' (in this case it's 'keeprunning') will go False
keeprunning = True
while keeprunning:

    # check if there is any keyboard input
    key, presstime = my_keyboard.get_key()

    # check if the input is a number
    if key in numbers:
        # then check if the number string we have is not
        # too long
        if len(numstring) < maxlength:
            # then add the number to the string!
            numstring += key

    # if the input was not a string, check if it was backspace
    elif key == 'backspace':
        # if it was backspace, remove the last number from
        # the string that contains the response
        numstring.pop(-1)

    # finally, if the input was not a string and not a number,
    # check if it was space
    elif key == 'space':
        # if it was, we can stop the loop
        keeprunning = False

    # now that we have the input, we need to show it to
    # the participant; first we clear the canvas, so the
    # previous contents is removed
    my_canvas.clear()
    # then we draw the current number
    my_canvas.text(numstring)
    # and we show the canvas, updating the display
    my_canvas.show()

# after running the loop, set some variables to store the
# response and the response time
exp.set("response", numstring)
exp.set("response_time", resptime - t0)