# Yahoo! UI Library

### yui 3.0.0b1

Yahoo! UI Library > yui > yui-later.js (source view)
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    (function() {
        var L = Y.Lang,

        /**
         * 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.
         */
        later = function(when, o, fn, data, periodic) {
            when = when || 0;
            o = o || {};
            var m=fn, d=data, f, r;

            if (L.isString(fn)) {
                m = o[fn];
            }

            if (!m) {
                Y.error("method undefined");
            }

            if (!L.isArray(d)) {
                d = [data];
            }

            f = function() {
                m.apply(o, d);
            };

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

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

        Y.later = later;
        L.later = later;

    })();

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