Hiding scale points in a drop-down randomized matrix table

Hi,

You can try this function.

Qualtrics.SurveyEngine.addOnReady(function () {
  var that = this;

  function hideDropdownItems(itemsToHide) {

    // Detect layout and select appropriate dropdown structure
    var questionRoot = document.querySelector('#question-' + that.questionId) 
                    || document.querySelector('#' + that.questionId);

    if (!questionRoot) return;

    var dropdownItems = questionRoot.querySelectorAll('li.menu-item');

    var isCustomStructure = dropdownItems.length > 0;
    if (!isCustomStructure) {
      dropdownItems = questionRoot.querySelectorAll('select');
    }

    // New Survey Taking Experience with dropdowns using <li.menu-item>
    if (isCustomStructure) {
      for (var i = 0; i < dropdownItems.length; i++) {
        var item = dropdownItems[i];
        var id = item.id;

        if (!id || !id.startsWith('menu-item-')) continue;

        var parts = id.split('-'); // "menu-item-1-2"
        if (parts.length < 4) continue;

        var statementNum = parts[2];
        var scaleNum = parts[3];

        for (var j = 0; j < itemsToHide.length; j++) {
          var rule = itemsToHide[j];
          if (rule[0] === statementNum && rule[1] === scaleNum) {
            item.style.display = 'none';
            break;
          }
        }
      }
    }

    // Legacy layouts with <select> structure
    else {
      for (var i = 0; i < dropdownItems.length; i++) {
        var select = dropdownItems[i];
        var selectId = select.id; // e.g., QR~QID1~2
        var idParts = selectId.split('~');
        if (idParts.length < 3) continue;

        var statementNum = idParts[2];

        var options = select.querySelectorAll('option');
        for (var j = 0; j < options.length; j++) {
          var option = options[j];
          var scaleNum = option.value;
          if (!scaleNum) continue;

          for (var k = 0; k < itemsToHide.length; k++) {
            var rule = itemsToHide[k];
            if (rule[0] === statementNum && rule[1] === scaleNum) {
              option.hidden = true;
              break;
            }
          }
        }
      }
    }
  }

  // [statementNum, scalePointNum] you want to hide
  var itemsToHide = [
    ["1", "2"],
    ["2", "3"],
    ["3", "1"]
  ];

  hideDropdownItems(itemsToHide);
});