How to set event listeners to Google Forms in script - google-forms

Question

I created a form using Google Forms UI. Now I want to enable some Form Elements based on the data from a Textfield.
function myFunction() {
var form = FormApp.openById(myformID);
var formitems = form.getItems()
//display the form elements and ids
for (var i in formitems) {
Logger.log(formitems[i].getTitle() + ': ' + formitems[i].getId());
}
var section3= form.getItemById(myformelementid)
Logger.log(section3.getTitle())
**//I want to add an eventlistener that triggers upon entering text in the textfield, the eventchange function can handle the enabling of other form elements
section3.addEventListener("change",onChangeEvent())**
}
Any help would be appreciated.

Answer 1

To do this in App Script (https://script.google.com/), you have to setUptrigger as follows:
function setUpTrigger() {
const form = FormApp.openById(formId);
const trigger = ScriptApp.newTrigger("onSubmit")
.forForm(form)
.onFormSubmit()
.create();
}
Then you can define the onSubmit function as follows:
async function onSubmit(e) {
const eResponse = e.response;
//get all response as an object
const response = eResponse.getItemResponses();
const responseObj = {};
//get all response as object with key value pair
for (let i = 0; i < response.length; i++) {
responseObj[response[i].getItem().getTitle()] = response[i].getResponse();
}
const email = eResponse.getRespondentEmail(); //get email address if you're collecting it
if (email) {
responseObj.email = email;
}
console.log("responseObj", responseObj);
}