Answers for "on key enter press"

javascript key pressed enter

$('.container').on('keydown', 'input', function(e) {
  if (e.keyCode === 13) {
    e.preventDefault();
  	e.stopImmediatePropagation();
    //Do your stuff...
  }
});

button onclick enter key

$("#id_of_textbox").keyup(function(event) {
    if (event.keyCode === 13) {
        $("#id_of_button").click();
    }
});