Accessing variables within conditional function

[wsr017]

Hello!

I am trying to make a simple break in my experiment after the participants complete a certain number of trials. There should be a break whenever completed_trials is a value contained within the break_intervals array. completed_trials is incremented on the finish of the previous trial. Here is what I have:

    var break_period = {
      type: 'html-keyboard-response',
      stimulus: "<p><b>BREAK</b></p><p>Good job! You have completed <b>" + completed_trials + "</b> out of <b>" + (nTrials) + " trials.</b></p><p>Take a break and relax your eyes. Press C when you want to continue the experiment. </p>",
      choices: [67],
    }

    var break_if_node = {
      timeline: [break_period],
      conditional_function: function(){
        if (break_intervals.includes(completed_trials)) {
          return true;
          } else {
          return false; 
        }
      }
    }

The problem that I'm having is that completed_trials always prints as 0 in the break_period stimulus. I know that completed_trials is incrementing correctly by checking in console and because the break_if_node evaluates to true at the desired intervals, but completed_trials is then printed as 0 in the stimulus. Is there something that I'm missing to pass the value of completed_trials along to break_period, so that people know how many trials they have done?

This might not be a jsPsych specific question, but I'm pretty new to all of this.

Thanks so much for the help!

[vijaymarupudi]

When you're constructing the timeline, all the code is run when you are defining the timeline, not when the participant is running the experiment. If you'd like to display the 'current' information will the participant is running the experiment, you'll want to make the parameter a function https://www.jspsych.org/overview/trial/#dynamic-parameters

If you'd like to learn more, these are called closures in Javascript!

[wsr017]

Aha! Thank you so much, I must have missed that in the tutorial. This forum is awesome.