Issue tagging data with global variables

[sshelat]

Hi all,

I'm writing a digit span task in jsPsych v7.3 and am running into some trouble tagging the subject digit responses with the correct digit sequence I define elsewhere in the code. The presentation of digits is running fine, but the data for the response should be tagged with the randomNumber and digitsLength, and it's not. My code is below. Does anyone have any insight into solving the problem? tagging @jodeleeuw

    var randomNumber;
    var digits = [];
    var digitsLength;

    function selectRandomDigits() {
      digits = [];
      digitsLength = 0;
      const possibleNumbers = [
        "1",
        "2",
        "3",
        "4",
        "5",
        "6",
        "7",
        "8",
        "9",
        "0",
      ];
      const minLength = 3;
      const maxLength = 9;
      const numberOfDigits =
        Math.floor(Math.random() * (maxLength - minLength + 1)) + minLength;
      randomNumber = "";
      for (let i = 0; i < numberOfDigits; i++) {
        var randomIndex = Math.floor(Math.random() * possibleNumbers.length);
        randomNumber += possibleNumbers[randomIndex];
      }
      for (let i = 0; i < randomNumber.length; i++) {
        digits.push(randomNumber[i]);
      }
      digitsLength = randomNumber.length;
      console.log(randomNumber);
      console.log(digits);
      console.log(digitsLength);
    }

    var selectRandomDigitsFxn = {
      type: jsPsychCallFunction,
      func: selectRandomDigits,
    };

    var digitSelection = -1;
    var digitTrial = {
      type: jsPsychHtmlKeyboardResponse,
      stimulus: function () {
        digitSelection += 1;
        return (
          '<div style="font-size:70px;">' + digits[digitSelection] + "</div>"
        );
      },
      choices: "NO_KEYS",
      trial_duration: 1000,
      post_trial_gap: 100,
    };


    var digitTrialNode = {
      timeline: [digitTrial],
      loop_function: function () {
        if (digitSelection + 1 === digitsLength) {
          return false;
        } else {
          return true;
        }
      },
    };

    var digitRecall = {
      type: jsPsychSurveyText,
      questions: [
        {prompt: 'List the digits in order, with no spaces or commas separating each one.'}
      ],
      data: { randomNum: randomNumber, length: digitsLength }
    }


    timeline.push(selectRandomDigitsFxn, digitTrialNode, digitRecall);

[jodeleeuw]

Hi @sshelat

You'll need to wrap those variables in a function to get a value that is updating during the experiment. Check out the docs on dynamic parameters for examples.

[sshelat]

Worked perfectly, thanks so much.