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我在 Qualtrics 中实现了一个实验，我使用 Javascript 从数组中为多个“属性”绘制随机值并随机化属性的顺序。简而言之，我采用随机绘制的值，将这些值放入它们自己的数组中，然后将新数组中的值打乱，并将它们作为字符串保存在嵌入的数据字段中。一个复杂性是随机抽取的两个属性（种族和性别）的值不会呈现给参与者，而是用于为属性（名称）创建一组可能的值，这些属性（名称）的值将呈现给参与者。

对于大多数调查对象，我的代码按预期工作，但有时我导出的数据显示有人已经到达运行 Javascript 的页面，但嵌入的数据字段（例如，我的示例中的“attr_viewed_names_string”和“attr_all_id_string”）为空。我已经通过移动设备和桌面设备多次完成了我的调查，但无法复制导致这些嵌入字段的值无法出现在我的数据中的过程。最大的问题是我不知道（a）代码是否实际上没有生成字符串，或者（b）字符串没有保存到嵌入字段。

下面是我在调查的第一页上实施的简化版本，用于创建字符串并保存它们。我是否错过了一些代码无法保存属性名称字符串的场景（例如“name|religion|race|gender”）

Qualtrics.SurveyEngine.addOnload(function()
{

/////////////////////////////////////////////////////
// DEFINE HELPERS
/////////////////////////////////////////////////////

// Function to randomize the ordering of the elements in arrays
   function shuffle(array){
        var counter = array.length,
            temp, index;
        while (counter > 0){
            index = Math.floor(Math.random() * counter);
            counter = counter-1;
            temp = array[counter];
            array[counter] = array[index];
            array[index] = temp;
        }
        return array;
    };
    
    
// Function to sample K elements from an array without replacement
// This is used for grabbing values for our attributes.
 function getRandom(arr, n) {
    var result = new Array(n),
        len = arr.length,
        taken = new Array(len);
    if (n > len)
        throw new RangeError("getRandom: more elements taken than available");
    while (n--) {
        var x = Math.floor(Math.random() * len);
        result[n] = arr[x in taken ? taken[x] : x];
        taken[x] = --len in taken ? taken[len] : len;
    }
    return result;
};
    
// Function that, given an array X containing arrays 1,2,3...k,
// randomly select one element from each 1, 2, 3, ...k
// and returns an array containing the values. Checks that
// it is an array and returns the original object if the element is
// not an array.
    function get1RandomForEach(array){
        return array.map(attr => Array.isArray(attr) ? getRandom(attr, 1) : attr);
    }
 
/////////////////////////////////////////////////////
// SPECIFY STUDY PARAMETERS
/////////////////////////////////////////////////////
   
// Number of choice tasks each participant completes
var choice_task_n = 1

// Number of profiles in total each participant will observe
var profiles_total = choice_task_n*2

/////////////////////////////////////////////////////
// CREATE ATTRIBUTES
/////////////////////////////////////////////////////
   
// Create the attributes and set of possible values for each
// attribute.
var religion = ["val1", "val2"];
var race = ["B", "W"];
var gender = ["F", "M"];    

// Create array of objects where each object contains key-value pairs
// for a name, race, and gender
var name_table = [{full_name: "name1", race: "W", gender: "F"}, 
{full_name: "name2", race: "B", gender: "F"}, 
{full_name: "name3", race: "B", gender: "M"}, 
{full_name: "nam4", race: "W", gender: "M"}];
    
// Create an array of objects containing all attributes participants will
// observe, an attribute identifier, and the possible values the variables
// can assume. Note that we assign the value "placeholder" to Name since
// the values depend on the gender and race.

var attr_table = [
    {attrib: "Religious Identification", category: "relig", vals: religion},
    {attrib: "Name", category: "name", vals: "placeholder"}
    ];
    
// Shuffle the order of the attributes
var attr_table_shuffled = shuffle(attr_table)

// Create arrays with the attribute names, attribute text, and 
// attribute values. This will be for the variables participants
// observe (in contrast with unobserved set that includes gender
// and race but excludes name)
var attr_viewed_vals = attr_table_shuffled.map(function(e){return e.vals;});
var attr_viewed_names = attr_table_shuffled.map(function(e){return e.attrib;});
var attr_viewed_id = attr_table_shuffled.map(function(e){return e.category;});

// Convert to delimited string for saving
var attr_viewed_names_string  = attr_viewed_names.join("|");
var attr_viewed_id_string  = attr_viewed_id.join("|");

// Add unobserved attributes' IDs to the id string to
// get all attributes' ids
var attr_all_id_string = attr_viewed_id_string + "|race|gender";

// Store the string in embedded data
Qualtrics.SurveyEngine.setEmbeddedData("attr_viewed_names_string",  attr_viewed_names_string);
Qualtrics.SurveyEngine.setEmbeddedData("attr_viewed_id_string",  attr_viewed_id_string);
Qualtrics.SurveyEngine.setEmbeddedData("attr_all_id_string",  attr_all_id_string);
    
});
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