Disable backspace and delete key with javascript in IE

Question

Anyone know how can I disable backspace and delete key with Javascript in IE? This is my code below, but seems it\'s not work for IE but fine for Mozilla.

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Answer 1

update based on @JoeCoders comment and the 'outdatedness' of my answer, I revised it.

document.querySelector([text input element]).onkeydown = checkKey;
function checkKey(e) {
    e = e || event;
    return !([8, 46].indexOf(e.which || e.keyCode || e.charCode) > -1);
}

See also this jsFiddle