Yahoo! UI Library

/**
 * Provides a setTimeout/setInterval wrapper
 * @module yui
 * @submodule yui-later
 */

/**
 * Executes the supplied function in the context of the supplied
 * object 'when' milliseconds later.  Executes the function a
 * single time unless periodic is set to true.
 * @method later
 * @for YUI
 * @param when {int} the number of milliseconds to wait until the fn
 * is executed.
 * @param o the context object.
 * @param fn {Function|String} the function to execute or the name of
 * the method in the 'o' object to execute.
 * @param data [Array] data that is provided to the function.  This
 * accepts either a single item or an array.  If an array is provided,
 * the function is executed with one parameter for each array item.
 * If you need to pass a single array parameter, it needs to be wrapped
 * in an array [myarray].
 * @param periodic {boolean} if true, executes continuously at supplied
 * interval until canceled.
 * @return {object} a timer object. Call the cancel() method on this
 * object to stop the timer.
 */
Y.later = function(when, o, fn, data, periodic) {
    when = when || 0;

    var m = fn, f, id;

    if (o && Y.Lang.isString(fn)) {
        m = o[fn];
    }

    f = !Y.Lang.isUndefined(data) ? function() {
        m.apply(o, Y.Array(data));
    } : function() {
        m.call(o);
    };

    id = (periodic) ? setInterval(f, when) : setTimeout(f, when);

    return {
        id: id,
        interval: periodic,
        cancel: function() {
            if (this.interval) {
                clearInterval(id);
            } else {
                clearTimeout(id);
            }
        }
    };
};

Y.Lang.later = Y.later;