Throttle Javascript events so that the same event doesn't fire twice in the timeframe

gistfile1.js

    /**
     * Kindly ask to redraw the one frame preview.
     *
     * This function has throttling support so you can
     * fire this from mouse move events (color picking) safely.
     *
     * XXX: Make sure all the fonts are loaded in this point or the
     * first round of text rendering fails. See hidden font preloader in creator.pt.
     *
     * @param elem Element to redraw. null to clear, undefined ot use selected.
     */
    requestOneFramePreview : function(elem) {

        var self = this;

        if(elem === undefined) {
            elem = this.organizer.selected;
        }

        function redraw() {
            self.oneFramePreviewTimeout = null;
            if(elem) {
                var data = elem.data("input-element");
                console.log(data);
            } else {
                console.log("Flushing preview");
            }
            self.updateOneFramePreview(elem);
        }

        if(this.oneFramePreviewTimeout) {
            window.clearTimeout(this.oneFramePreviewTimeout);
        }

        this.oneFramePreviewTimeout = window.setTimeout(redraw, 450);
    }