Why won't form.submit() trigger the "submit" event?

Question

I am submitting my form by using JavaScript .submit() function.

form.submit();

But when I using addEventListener to capture my submit event, it wouldn't work.

form.addEventListener("submit", function(event){
    //codes
});

I found out addEvenetListener function will only listen for onsubmit event instead of submit. Is there have any alternative solution to call my function when form.submit() is executed?

ps: For some reasons I need to stay with form.submit() to submit my form instead of using submit button.

Answer 1

According to MDN:

The form's onsubmit event handler (for example, onsubmit="return false;") will not be triggered when invoking this method from Gecko-based applications. In general, it is not guaranteed to be invoked by HTML user agents.

To get around this issue, try using dispatchEvent():

var form = document.querySelector('form');

form.addEventListener('submit', function () {
  console.log('invoked');
  
  return false;
});

// form.submit();
form.dispatchEvent(new Event('submit'));

<form></form>