simple_example_of_google_script.js

var form = FormApp.openByUrl("paste_the_link_of_the_form_here")
var students = [{"classcode":"1A","classno":1,"name":"Apple"},
{"classcode":"1A","classno":2,"name":"Ball"},
{"classcode":"1A","classno":3,"name":"Cat"},
{"classcode":"1A","classno":4,"name":"Dog"},
{"classcode":"1A","classno":5,"name":"Egg"},
{"classcode":"1A","classno":6,"name":"Fan"},
{"classcode":"1A","classno":7,"name":"Goat"},
{"classcode":"1A","classno":8,"name":"Hand"},
{"classcode":"1A","classno":9,"name":"Indian"},
{"classcode":"1A","classno":10,"name":"Jam"},
{"classcode":"1A","classno":11,"name":"King"},
{"classcode":"1A","classno":12,"name":"Lamp"},
{"classcode":"1A","classno":13,"name":"Man"},
{"classcode":"1A","classno":14,"name":"Nurse"},
{"classcode":"1A","classno":15,"name":"Owl"},
{"classcode":"1A","classno":16,"name":"Pizza"},
{"classcode":"1A","classno":17,"name":"Queen"},
{"classcode":"1A","classno":18,"name":"Rail"},
{"classcode":"1A","classno":19,"name":"Sun"},
{"classcode":"1A","classno":20,"name":"Tiger"},
{"classcode":"1A","classno":21,"name":"Umbrella"},
{"classcode":"1A","classno":22,"name":"Vase"},
{"classcode":"1A","classno":23,"name":"Woman"},
{"classcode":"1A","classno":24,"name":"Box"},
{"classcode":"1A","classno":25,"name":"Yard"},
{"classcode":"1A","classno":26,"name":"Zoo"}]

function printTitle() {
  var title = form.getTitle() // get the title of the form
  Logger.log(title) // print the title in logger
}

function cleanup() {
  form.getItems().forEach(function(item) {
    form.deleteItem(item)
  })
}

function addStudentList() {
  // map method change the content in the students array
  // from {"classcode":"1A","classno":1,"name":"Apple"} to "1A - 1 - Apple"
  var list = students.map(function(obj){
    return obj.classcode + "(" + obj.classno + ") - " + obj.name  
  })
  
  form.addListItem()
  .setTitle("Please select your name") // set title  of the question
  .setRequired(true) // become a required question
  .setChoiceValues(list) // set the list to choose
}

function askCourseInfo() {
  // loop the contents 5 times
  for (i = 0 ; i < 5 ; i++) {
    // add section header for each question
    form.addSectionHeaderItem().setTitle("Course " + (i + 1))
    // 1 line text input
    form.addTextItem().setTitle("Course ID")
    // multiple line text input
    form.addParagraphTextItem().setTitle("Course Information")
  }
}

function fullRun() {
  cleanup()
  form.setTitle("Mock Interview Application") // set title of the form
  addStudentList()
  askCourseInfo() 
}