Build 'pages' parameter for jsPsychSurvey based on user input from previous trial

[mrinmayik]

Hello,

I'm building an experiment where the participant first enters a bunch of information, and then a subsequent jsPsychSurvey trial displays the input from the participant to ask further questions.

This is what I had planned:

//trial where user enters the information that will be used
var NPAT_Responses = {
        timeline : [
            {
                type: jsPsychSurveyHtmlForm,
                html: function() {
                    return `<div><h3>Participant: ${jsPsych.timelineVariable('Letter')}</h1> <input name="name" type="text" placeholder="Name" /> <input name="place" type="text" placeholder="Place" /><input name="animal" type="text" placeholder="Animal" /> <input name="thing" type="text" placeholder="Thing" /></div>`
                },
                data: {
                    task : function(){
                        return `Participant_${jsPsych.timelineVariable('Letter')}`
                    }
                }
            },
            {
                type: jsPsychSurveyHtmlForm,
                html: function() {
                    return `<div><h3>Experimenter: ${jsPsych.timelineVariable('Letter')}</h1> <input name="name" type="text" placeholder="Name" /> <input name="place" type="text" placeholder="Place" /><input name="animal" type="text" placeholder="Animal" /> <input name="thing" type="text" placeholder="Thing" /></div>`
                },
                data: {
                    task : function(){
                        return `Experimenter_${jsPsych.timelineVariable('Letter')}`
                    }
                }
            }
        ],
        timeline_variables : [{Letter : 'N'},
                              {Letter : 'T'},
                              {Letter : 'K'},
                              {Letter : 'I'}],
    }

// Get the participant's responses from that trial and build 'pages' for the next trial
var SourceQuestions = [
    ...jsPsych.data.get().trials.filter(trial => /Experimenter_*/.test(trial.task)).reduce((acc, item) => {
        for(const category in item.response) {
            acc.push({
                type: 'multi-choice',
                prompt: `${item.response[category]} (said by experimenter)`,
                name: `${item.response[category]}_Source`,
                options: ['Correct source', 'Incorrect souce', 'Did not know', 'Was not asked the question']
            });
        }
        return acc;
    }, []),
    ...jsPsych.data.get().trials.filter(trial => /Participant_*/.test(trial.task)).reduce((acc, item) => {
        for(const category in item.response) {
            acc.push({
                type: 'multi-choice',
                prompt: `${item.response[category]} (said by participant)`,
                name: `${item.response[category]}_Source`,
                options: ['Correct source', 'Incorrect souce', 'Did not know', 'Was not asked the question']
            });
        }
        return acc;
    }, [])]

//Then use this as pages in the next trial
var NPAT_Recall = {
    type: jsPsychSurvey,
    show_question_numbers : 'onPage',
    data : {
        task : 'npatrecall'
    },
    timeline: [
        {
            pages : [SourceQuestions]
        }
    ],
}

timeline.push(NPAT_Responses, NPAT_Recall)

But when I run this I get the error: There is no visible page or question in the survey., presumably because when NPAT_Recall is created at compilation, there are no trials in the data that can be filtered to build the page.

I've played around with defining NPAT_Recall inside an on_finish block in the NPAT_Responses trial, and then using jsPsych.addNodeToEndOfTimeline. That works, but it adds NPAT_Recall to the end of the experiment, rather than after NPAT_Responses.

There is a solution here that might work. But I'm just not sure what to replace trial.stimulus within the on_start block, to supply the information to pages.

Thanks a lot!
Mrinmayi

[ChristopheBossens]

Hi mrinmayik,

I think what you need here are dynamic parameters. So in the NPAT_Recall trial, your pages should be defined as a function that returns an array with the pages. That function will be called the moment that your trial is initiated so it should work