Conditional question: error when trying to get data

[lhunim95]

Dear community,

I am currently trying to create a filter question from a survey with multiple questions. If this particular question is answered "No", I would like to ask another question afterwards. If the question is answered with "Yes", the timeline should simply continue. However, I have the problem that the following error message always appears:
"cannot read properties of undefined (reading responses)".

Filter question is Question 3 and the conditional timeline should run when the question is answered with "no" (= value 1).

var survey_one = {
  type: 'survey-likert',
  questions: [
    {prompt: "Question1", labels: scale_5, name: 'question1', required: true},
    {prompt: "Question2", labels: scale_3, name: 'question2', required: true},
    {prompt: "Question3", labels: scale_4, name: 'question3', required: true}
  ],
  button_label: 'Weiter'
}
timeline.push(survey_one)

var conditional_question = {
  type: 'survey-likert',
  questions: [
    {prompt: "conditional", labels: scale_6, name: 'conditional_question', required: true}
  ],
  button_label: 'Weiter'
}

var conditional = {
  timeline: [conditional_question],
  conditional_function() {
    var last_trial_data = jsPsych.data.get().filter({name: 'question3'}).values()[0].responses
    if (last_trial_data.response == 1) {
      return true;
    } else {
      return false;
    }
  }
};
timeline.push(final_questions_conditional)

So something seems to be wrong with accessing data, but I do not know how to solve it.

I'd be very happy about some help. :)

Best regards,
Larissa

[jodeleeuw]

Hi @lhunim95,

The line where you are filtering the data isn't quite right. Unfortunately you can't filter on the name property of the question, because that data is nested inside the response property. filter() also only works at the whole-trial level, so you can't filter to just one of the questions.

Try this instead:

var last_trial_data = jsPsych.data.get().last(1).values()[0].response.question3;
if(last_trial_data == 1) {
 ...

This uses the last() function to get only the previous trial, and then accesses the question3 answer in the response data. Note that this is response and not responses. This was changed in v6.3 for better consistency across plugins.

[lhunim95]

you made my day!!! Thank you so much :)