How to register document.onkeypress event

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EDIT:

Javascript:

document.addEventListener("keydown", keyDownTextField, false);

function keyDownTextField(e) {
var keyCode = e.keyCode;
  if(keyCode==13) {
  alert("You hit the enter key.");
  } else {
  alert("Oh no you didn't.");
  }
}

DEMO: JSFIDDLE