Saving the data with subject ID in file name

[becky-gilbert]

Here's how to generate a random ID for each participant, save it to the data, and save the data as a local file with this ID in the name.
You can use the jsPsych.randomization.randomID function to generate the ID string, and the jsPsych.data.addProperties function to add this ID to the data for all trials. Then to save a file that includes this ID in the file name, you can create a file name variable by joining text and the ID variable with the + operator.

// generate a random subject ID that contains 8 alphanumeric characters
var rand_subject_id = jsPsych.randomization.randomID(8);
// add the ID to the data for all trials
jsPsych.data.addProperties({ID: rand_subject_id});

var trial = {
  type: 'html-keyboard-response',
  stimulus: 'Hello!'
};

jsPsych.init({
  timeline: [trial],
  on_finish: function () {
    // combine the subject ID with the file extension (and any other text) to dynamically create the file name
    var file_name = 'subject_' + rand_subject_id + '_data.csv';
    // save the data with this file name
    jsPsych.data.get().localSave('csv',file_name);
  }
});

Or, if you want to get the ID from a response that was made during the experiment, you can do that by filtering the data to find the data from the ID question using the filter function, then getting the raw data values with the values function, then selecting the first (only) trial in that array, and then finding the value associated with the question called "id" in the "responses" object.

var id_trial = {
  type: 'survey-text',
  questions: [{prompt: 'Please enter your ID.', name: 'id', required: true}],
  data: {task_part: 'id_question'}
};

jsPsych.init({
  timeline: [id_trial],
  on_finish: function () {
    // get the ID that was entered from the jsPsych data
    var id = jsPsych.data.get().filter({task_part: 'id_question'}).values()[0].response.id;
    // add this ID to the data for all trials
    jsPsych.data.addProperties({ID: id});
    // combine the subject ID with the file extension (and any other text) to dynamically create the file name
    var file_name = 'subject_' + id + '_data.csv';
    // save the data with this file name
    jsPsych.data.get().localSave('csv',file_name);
  }
});

[xiaoqilt]

var id = jsPsych.data.get().filter({task_part: 'id_question'}).values()[0].response.id;

Autofocus processing was blocked because a document already has a focused element.
test1.html:44

   Uncaught TypeError: Cannot read properties of undefined (reading 'id')
at Object.on_finish (test1.html:44:87)
at finishExperiment (jspsych.js:815:10)
at nextTrial (jspsych.js:839:7)
at window.jsPsych.core.finishTrial (jspsych.js:267:9)
at HTMLFormElement.<anonymous> (jspsych-survey-text.js:169:15)