onSubmit unexpected behavior

[assachs]

Hello,
i have a problem with form submission and found the following. Is this an expected behavior or is this a bug?

There are different ways to define a submit eventhandler of a form:

D1. in the form element: ...form id="f1" onsubmit="alert('test')"..
D2. with plain javascript: document.getElementById('f2').addEventListener('submit', function() {alert('test1');});
D3. with jquery on: $('#f3').on('submit', function() {alert('test2');});

There are also different ways to execute the submission of a form:

E1. With a submit button
the eventhandler is executed regardless how it was defined ( D1, D2, D3)

E2. With javascript submit()
The eventhandler is never called (that is expected according to the documentation)

E3. With javascript requestSubmit()
the eventhandler is executed regardless how it was defined ( D1, D2, D3)

E4. with jquery trigger("submit")
The eventhandler is only executed in case D1 and D3. It is not executed in case D2 (defined with addEventListener).
Is this expected?

I found this while migration from D1 to D2 and now the events are not executed any more (i am using E4).

I could migrate from D1 to D3. Or i stay with D2 and also migrate from E4 to E3.

Thanks
Andi

[dmethvin]

In general, jQuery only calls event handlers that are attached by jQuery when a method like .trigger() is used. Each time you attach an event handler, jQuery adds it to a list of handlers so that it can be called if you use .trigger(). jQuery doesn't know what event handlers may have been attached by other methods. There may be some exception that I'm not thinking about, but that's the general rule.