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

function onKeyDown(e) {
    alert("test!");
}

jsfiddle:

http://jsfiddle.net/ubfBq/

window.attachEvent is defined and the event listener added. But it never shows "test!" alert.

I read something about useCapture flag, which is possible to use in the other methods. It captures the key press on the window before the event "goes down". Internet Explorer doesn't seem to allow/use this. Is that the problem? If yes, how can I solve it?

Answer 1

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);
    }
}