Set input value of textbox correctly using Javascript

Question

I have a website with a Username textbox and a Password textbox and a Sign in button for login. On that website if I login by entering the username and password manually, it works fine. But when I do it using JS like this

document.getElementById('userId').value = 'name';
document.getElementById('pwd').value = 'password';

And click the login button, it shows error "Please enter a username and password for login", i.e. it's not picking up the values.

I also tried despatching the event like this but no luck

var username = document.getElementById('userId');
username.value = 'name';

if ('createEvent' in document) {
  var evt = document.createEvent("HTMLEvents");
  evt.initEvent('change', false, true);
  username.dispatchEvent(evt);
} else {
  username.fireEvent('onchange');
}

var password = document.getElementById('pwd');
password.value = 'password';

if ('createEvent' in document) {
  var evt = document.createEvent("HTMLEvents");
  evt.initEvent('change', false, true);
  password.dispatchEvent(evt);
} else {
  password.fireEvent('onchange');
}

So my only question to experts out here is what should be the Javascript/JQuery code that I can write which will blueprint the logic of changing the textbox value manually.

Do your inputs shows assigned value? Do you validate input values before sending request? — Hikmat G.
– Hikmat G., Commented Jun 24, 2018 at 10:19
@dhaker This is the website URL : irctc.co.in/nget/train-search. Click on "Login" link on top and the login page appears. — Vishal Afre
– Vishal Afre, Commented Jun 24, 2018 at 10:30
I think the problem is elsewhere. Can you see the textbox changes when you do it via JS? See this Fiddle example for working code via JS — Mahbub Moon
– Mahbub Moon, Commented Jun 24, 2018 at 10:40
@MahßußMØøn that's what surprising me more. There are no textbox changes neither by doing it via JS nor via typing manually — Vishal Afre
– Vishal Afre, Commented Jun 24, 2018 at 10:48

Vishal Afre · Accepted Answer · 2018-06-25 10:17:11Z

After some research, I was able to get the job done by just a small change. Instead of firing onchange event, I had to fire oninput event. I figured this out by Chrome Developer Tool as I saw in Event listeners tab that no "change" event was associated with textbox. Instead, it had "input" event. So the following code fixed it :)

var username = document.getElementById('userId');
username.value = 'name';

if ('createEvent' in document) {
var evt = document.createEvent("HTMLEvents");
evt.initEvent('input', false, true);
username.dispatchEvent(evt);
}
else {
username.fireEvent('oninput');
}

var password = document.getElementById('pwd');
password.value = 'password';

if ('createEvent' in document) {
var evt = document.createEvent("HTMLEvents");
evt.initEvent('input', false, true);
password.dispatchEvent(evt);
}
else {
password.fireEvent('oninput');
}

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