Simulate keypress without jquery [duplicate]

Answer 1

var evt = document.createEvent("KeyboardEvent");
evt.initKeyEvent ("keypress", true, true, window,
                0, 0, 0, 0,
                13, 13); 
var canceled = !body.dispatchEvent(evt);

Documentation: https://developer.mozilla.org/en-US/docs/Web/API/event.initKeyEvent

For Webkit-based browser the initialization might be a bit different

initKeyboardEvent(in DOMString typeArg, 
              in boolean canBubbleArg, 
              in boolean cancelableArg, 
              in views::AbstractView viewArg, 
              in DOMString keyIdentifierArg, 
              in unsigned long keyLocationArg, 
              in boolean ctrlKeyArg, 
              in boolean shiftKeyArg, 
              in boolean altKeyArg, 
              in boolean metaKeyArg, 
              in boolean altGraphKeyArg);