Problem saving the data

[sebgok]

Hi,
I am trying to save data in csv files at the latest version of jsPsych, but couldn't manage. I'm wondering if I have a problem with the following code, or with how I ordered the variables?

<script>


var jsPsych = initJsPsych({
  display_element: "jspsych-target",
   on_finish: function(){ saveData(subjectID, jsPsych.data.get().csv()); }
});

    


    var timelineText = [];
    var timelinePicture = [];
  

                   var subjectID = prompt('What is your IU user name? (You need to type in your username so we can grant you credits for your participation. Otherwise, we will not know who you are.)');
         if (subjectID === '' || subjectID == null) {subjectID=Math.floor(Math.random()*10000).toString()};
         jsPsych.data.addProperties({subject_id: subjectID});
        
        
[several different trials here]

if (Math.random()<0.5){
    jsPsych.run(timelineText);
}
else {
  jsPsych.run(timelinePicture);
}

function saveData(name, data){
  var xhr = new XMLHttpRequest();
  xhr.open('POST', 'write_data.php'); // 'write_data.php' is the path to the php file described above.
  xhr.setRequestHeader('Content-Type', 'application/json');
  xhr.send(JSON.stringify({filename: name, filedata: data}));
}


  </script>