Can I randomize items in MultipleChoiceItem?

问题

I'm new to GoogleAppsScript and now making quizzes in google form and spreadsheet by using GAS.

I want to shuffle items in a MultipleChoiceItem when the google form is reloaded.

A part of my current scirpt, slightly modified form this code, is presented below.

//vars from spreadsheet
var form = FormApp.openById(id);
var ss = SpreadsheetApp.openById(question_bank_ID);
var text = sheet.getSheetValues(questions[i]+1, 2, 1, 1)[0][0];
var options = sheet.getSheetValues(questions[i]+1, 5, 1, 5)[0];
var ans = sheet2.getSheetValues(questions[i]+1, 5, 1, 5)[0];

//MultipleChoiceItem
var mc = form.addMultipleChoiceItem().setTitle(text);
        mc.setPoints(1) // set point 
         // add choices with isCorrect
        while (options[options.length - 1] === "") {
          options.pop();
        }
        mc.setChoices(options.map(function (options, i) {
          return mc.createChoice(options, ans[i]);
        }
                                 )
                      )

Could someone please tell me a solution? Thanks for your help!

回答1:

• In order to shuffle your values each time your form is reloaded, you need to bind to your form a script with an onOpen trigger
• Retrieve all questions and for each question retrieve the choices
• Use a shuffle function to randomize the choices
• Assign the shuffled choices back to the question

Sample:

function onOpen(){
  form = FormApp.getActiveForm();
  var questions = form.getItems();
  for (var i =0; i < questions.length; i++){
    var question = questions[i];
    var choices = question.asMultipleChoiceItem().getChoices();
    var newChoices = shuffle(choices);
    question.asMultipleChoiceItem().setChoices(newChoices);
  }

}


function shuffle(array) {
  for (var i = array.length - 1; i > 0; i--) {
    var j = Math.floor(Math.random() * (i + 1));
    var temp = array[i];
    array[i] = array[j];
    array[j] = temp;
  }
  return array;
}

UPDATE:

If you want to give to every user the same quiz but with randomized questions, there is no direct way to do it - so far there is no method of the kind setShuffleItems. All you can do for the moment is a workaround, e.g. you can bind to the sample above an installable time-driven trigger which would shuffle the items in desired intervals (the minimum is one minute). This does not guarantee that each user will see a different quiz, but at least each minute the quiz will be different.

来源：https://stackoverflow.com/questions/60112365/can-i-randomize-items-in-multiplechoiceitem