javascript - JQuery enter event doesn't trigger form submission -

usually, when press enter on input inside form submit button triggers form submission, when tried same result calling jquery's trigger function doesn't work. idea why?

var ev =$.event('keydown',{keycode:13}); $('#myinput').trigger(ev); 

the event called form doesn't submit.

$('#id').on('change',function(){  document.getelementsbyname('formname').submit(); });