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

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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(); });

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