carhartl / jquery-cookie

/**
 * jQuery Cookie plugin
 *
 * Copyright (c) 2010 Klaus Hartl (stilbuero.de)
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 */
(function($) {
    $.cookie = function(key, value, options) {

        // key and at least value given, set cookie...
        if (arguments.length > 1 && (Object.prototype.toString.call(value) === "[object String]" || value === null || value === undefined)) {
            options = $.extend({}, options);

            if (value === null || value === undefined) {
                options.expires = -1;
            }

            if (typeof options.expires === 'number') {
                var days = options.expires, t = options.expires = new Date();
                t.setDate(t.getDate() + days);
            }

            value = String(value);

            return (document.cookie = [
                encodeURIComponent(key), '=',
                options.raw ? value : encodeURIComponent(value),
                options.expires ? '; expires=' + options.expires.toUTCString() : '', // use expires attribute, max-age is not supported by IE
                options.path ? '; path=' + options.path : '',
                options.domain ? '; domain=' + options.domain : '',
                options.secure ? '; secure' : ''
            ].join(''));
        }

        // key and possibly options given, get cookie...
        options = value || {};
        var decode = options.raw ? function(s) { return s; } : decodeURIComponent;

        var parts = document.cookie.split('; ');
        for (var i = 0, part; part = parts[i]; i++) {
            var pair = part.split('=');
            if (decode(pair[0]) === key) return decode(pair[1] || ''); // IE saves cookies with empty string as "c; ", e.g. without "=" as opposed to EOMB
        }
        return null;
    };
})(jQuery);