JS & CoffeeScript DOM ready listeners

domready.coffee

###
# Based on:
# jQuery JavaScript Library v1.4.2
# http://jquery.com/
#
# Copyright 2010, John Resig
# Dual licensed under the MIT or GPL Version 2 licenses.
# http://jquery.org/license
###

# DOM ready event listener
window.ready = ( ->

    ready_event_fired = false

    (fn) ->

        # Create an idempotent version of the 'fn' function
        idempotent_fn = () ->
            unless ready_event_fired
                ready_event_fired = true
                fn()

        # The DOM ready check for Internet Explorer
        do_scroll_check = () ->
            # If IE is used, use the trick by Diego Perini
            # http://javascript.nwbox.com/IEContentLoaded/
            try 
                document.documentElement.doScroll "left"
            catch e
                setTimeout do_scroll_check, 1
                return
            # Execute any waiting functions
            idempotent_fn()


        # If the browser ready event has already occurred
        if document.readyState is "complete"
            return idempotent_fn()

        # Mozilla, Opera and webkit nightlies currently support this event
        if document.addEventListener
            # Use the handy event callback
            document.addEventListener "DOMContentLoaded", idempotent_fn, false
            # A fallback to window.onload, that will always work
            window.addEventListener "load", idempotent_fn, false

        # If IE event model is used
        else if document.attachEvent
            # Ensure firing before onload; maybe late but safe also for iframes
            document.attachEvent "onreadystatechange", idempotent_fn
            # A fallback to window.onload, that will always work
            window.attachEvent "onload", idempotent_fn
            # If IE and not a frame:
            # continually check to see if the document is ready
            do_scroll_check() if document?.documentElement?.doScroll and window?.frameElement is null
)()

domready.js

/*!
 * Based on:
 * jQuery JavaScript Library v1.4.2
 * http://jquery.com/
 *
 * Copyright 2010, John Resig
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://jquery.org/license
 */
(function () {

    // DOM ready event listener
    var ready = (function () {
        var ready_event_fired = false;
        var ready_event_listener = function (fn) {

            // Create an idempotent version of the 'fn' function
            var idempotent_fn = function () {
                if (ready_event_fired) {
                    return;
                }
                ready_event_fired = true;
                return fn();
            }

            // The DOM ready check for Internet Explorer
            var do_scroll_check = function () {
                if (ready_event_fired) {
                    return;
                }

                // If IE is used, use the trick by Diego Perini
                // http://javascript.nwbox.com/IEContentLoaded/
                try {
                    document.documentElement.doScroll('left');
                } catch(e) {
                    setTimeout(do_scroll_check, 1);
                    return;
                }

                // Execute any waiting functions
                return idempotent_fn();
            }

            // If the browser ready event has already occured
            if (document.readyState === "complete") {
                return idempotent_fn()
            }

            // Mozilla, Opera and webkit nightlies currently support this event
            if (document.addEventListener) {

                // Use the handy event callback
                document.addEventListener("DOMContentLoaded", idempotent_fn, false);

                // A fallback to window.onload, that will always work
                window.addEventListener("load", idempotent_fn, false);

            // If IE event model is used
            } else if (document.attachEvent) {

                // Ensure firing before onload; maybe late but safe also for iframes
                document.attachEvent("onreadystatechange", idempotent_fn);

                // A fallback to window.onload, that will always work
                window.attachEvent("onload", idempotent_fn);

                // If IE and not a frame:
                // continually check to see if the document is ready
                var toplevel = false;

                try {
                    toplevel = window.frameElement == null;
                } catch (e) {}

                if (document.documentElement.doScroll && toplevel) {
                    return do_scroll_check();
                }
            }
        };
        return ready_event_listener;
    })();

    // Put your own code here
    var ready_1 = function () {
        alert('foo');
    };
    var ready_2 = function () {
        alert('bar');
    };

    // Pass your functions to ready()
    ready(function () {
        ready_1();
        ready_2();
    });

})();