Why keydown listener doesn't work in IE

Question

Im trying to run this in IE 8 but it doesn\'t work, any idea? It works in Firefox, Chrome, Opera...

preventBackspace();

function preventBackspace() {
    tr         


        

Answer 1

Use document.attachEvent instead. :]

Answer 2

It appears that only IE9 and later support binding keydown on window: http://www.quirksmode.org/dom/events/keys.html#t00

Instead, bind it to the document for IE:

function preventBackspace() {
    try {
        if (window.addEventListener) {
            window.addEventListener("keydown", onKeyDown, true);
        } else if (document.attachEvent) { // IE 
            alert(document);
            document.attachEvent("onkeydown", onKeyDown);
        } else {
            document.addEventListener("keydown", onKeyDown, true);
        }
    } catch (e) {
        alert(e);
    }
}