Hey @rooper. 

nice challenge. I tested it with this question:  

Implemented this code and added it as JavaScript to the multiple choice question: 

Qualtrics.SurveyEngine.addOnload(function() {
    var startDateStr = "${e://Field/START}"; // Format: MM-DD-YYYY

    // Parse the start date
    var startDateParts = startDateStr.split("-");
    var startDate = new Date(startDatePartsa2], startDatePartsa0] - 1, startDatePartsa1]); // YYYY, MM-1, DD

    // Get today's date
    var today = new Date();

    // Calculate the difference in days
    var diffTime = today - startDate;
    var diffDays = Math.floor(diffTime / (1000 * 60 * 60 * 24));

    // Determine how many list items to show
    var weeksSinceStart = Math.floor(diffDays / 7);

    // Select the list items
    var listItems = document.querySelectorAll("#" + this.questionId + " .QuestionBody .ChoiceStructure .Selection");

    // Hide all list items initially
    listItems.forEach(function(li) {
        li.style.display = "none";
    });

    // Show the appropriate number of list items
    for (var i = 0; i <= weeksSinceStart && i < listItems.length; i++) {
        listItemsti].style.display = "";
    }
});

And in the survey flow before the multiple choice question block I defined some embedded data field START in format MM-DD-YYYY: 

This date is the first date of the first week of your lessons. In my example, I let it start 2 days ago. Taking the survey results in this view: 

If I change START to 07-15-2024 and let it start one week earlier: 

Change to 06-17-2024:

Change to some date later than today: 

Hope I could help! 

Best
Christian

Hey @chackbusch, wow, thank you so much for your thoughtful help! This looks great. One challenge: the patients in this study will onboard to the program on different days, such that every person’s START will be staggered. That’s why I thought STARTDATE could be a good way to go, since that is embedding correctly according to when my test accounts start the survey. Is there a way to adapt your approach to accommodate their offset start dates? Thanks again!

@rooper Sure. Replace the START value with this piped text: 

And slightly adjust the code to consider “/” instead of “-”: 

Qualtrics.SurveyEngine.addOnload(function() {
    var startDateStr = "${e://Field/START}"; // Format: MM/DD/YYYY

    // Parse the start date
    var startDateParts = startDateStr.split("/");
    var startDate = new Date(startDatePartsr2], startDatePartsr0] - 1, startDatePartsr1]); // YYYY, MM-1, DD

    // Get today's date
    var today = new Date();

    // Calculate the difference in days
    var diffTime = today - startDate;
    var diffDays = Math.floor(diffTime / (1000 * 60 * 60 * 24));

    // Determine how many list items to show
    var weeksSinceStart = Math.floor(diffDays / 7);

    // Select the list items
    var listItems = document.querySelectorAll("#" + this.questionId + " .QuestionBody .ChoiceStructure .Selection");

    // Hide all list items initially
    listItems.forEach(function(li) {
        li.style.display = "none";
    });

    // Show the appropriate number of list items
    for (var i = 0; i <= weeksSinceStart && i < listItems.length; i++) {
        listItems i].style.display = "";
    }
});

The embedded data should be placed before the first question so that the current date is set for START when the survey is started.

Best
Christian

Thank you again for your help and apologies for the follow ups -- I’m still running into an issue for some reason. I embed the START variable at the top of my survey flow, along with a few other variables. 

Then, I combined our javascript in my multiple choice question (mine hides the next button and advances to the next page upon selection). That code looks like this: 

Qualtrics.SurveyEngine.addOnload(function() {
    // First functionality: Hide navigation buttons and auto-advance on choice selection
    if ($('NextButton')) {
        $('NextButton').hide();
    }
    if ($('PreviousButton')) {
        $('PreviousButton').hide();
    }
    var that = this;

    // Automatically advances to the next page after a choice is made
    this.questionclick = function(event, element) {
        if (element.type == 'radio') {
            switch (element.id) {
                case 'QR~QID602~24':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson1");
                    break;
                case 'QR~QID602~6':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson2");
                    break;
                case 'QR~QID602~8':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson3");
                    break;
                case 'QR~QID602~10':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson4");
                    break;
                case 'QR~QID602~12':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson5");
                    break;
                case 'QR~QID602~14':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson6");
                    break;
                case 'QR~QID602~16':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson7");
                    break;
                case 'QR~QID602~20':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson8");
                    break;
                case 'QR~QID602~32':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson9");
                    break;
                case 'QR~QID602~61':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson10");
                    break;
                case 'QR~QID602~62':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson11");
                    break;
                case 'QR~QID602~63':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson12");
                    break;
                case 'QR~QID602~64':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson13");
                    break;
                case 'QR~QID602~65':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson14");
                    break;
                case 'QR~QID602~66':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson15");
                    break;
                case 'QR~QID602~67':
                    Qualtrics.SurveyEngine.setEmbeddedData("FirstTocSelected", "Lesson16");
                    break;
            }
            that.clickNextButton();
        }
    }

    // Second functionality: Show list items based on weeks since start date
    var startDateStr = "${e://Field/START}"; // Format: MM/DD/YYYY

    // Parse the start date
    var startDateParts = startDateStr.split("/");
    var startDate = new Date(startDatePartsa2], startDatePartsa0] - 1, startDatePartsa1]); // YYYY, MM-1, DD

    // Get today's date
    var today = new Date();

    // Calculate the difference in days
    var diffTime = today - startDate;
    var diffDays = Math.floor(diffTime / (1000 * 60 * 60 * 24));

    // Determine how many list items to show
    var weeksSinceStart = Math.floor(diffDays / 7);

    // Select the list items
    var listItems = document.querySelectorAll("#" + this.questionId + " .QuestionBody .ChoiceStructure .Selection");

    // Hide all list items initially
    listItems.forEach(function(li) {
        li.style.display = "none";
    });

    // Show the appropriate number of list items
    for (var i = 0; i <= weeksSinceStart && i < listItems.length; i++) {
        listItemsti].style.display = "";
    }
});

But when I go to my survey, I still see all the options displayed, even though this test account is only in week 2. 

Thank you so much again for all your help today! I really appreciate it. 

Hey @chackbusch, I just wanted to say I got this working today based on your code -- thanks again for your help, you really made a big difference in my ability to make this project work. Thank you!

@rooper Thank you for the feedback! Actually I did not have your last comment on my list. Glad you could finalize it on your own!