Potch Dot Me

I made a few improvements to my Firefox truncation method this past weekend:

• No longer depends on YUI to run. Since it's Firefox-only, I can assume a few nifty JS bits like getComputedStyle() and getElementsByClassName().
• Improved the truncation algorithm. I was simply lopping off characters until it was the right length, but that performed very poorly, for obvious reasons. I'm now doing a binary "search" for the right length, which runs great (in my opinion).
• onresize "debounce": I've written a little helper method that wraps the event handler for the resize event. When resizing the browser window, the event is fired every time the mouse is moved, causing a load of lag. The helper method limits how often the event handler fires, and makes sure it stops firing once the resize is over.

Here's the source of the debouncer:

function debounce(fn, ms, ctxt) {
    var ctx = ctxt || window;
    var it, to, del = ms, fun = fn;
    return function () {
        var args = arguments;
        if (!it) {
            it = setInterval(function () {
                fun.apply(ctx, args);
            },del);
        }
        clearTimeout(to);
        to = setTimeout(function() {
            clearInterval(it);
            it = false;
        },del);
    };
}

To use it:

document.onresize = debounce(handler, 100);