js/jquery/jquery.cookie.js

   1 /*jslint browser: true */ /*global jQuery: true */
   2
   3 /**
   4  * jQuery Cookie plugin
   5  *
   6  * Copyright (c) 2010 Klaus Hartl (stilbuero.de)
   7  * Dual licensed under the MIT and GPL licenses:
   8  * http://www.opensource.org/licenses/mit-license.php
   9  * http://www.gnu.org/licenses/gpl.html
  10  *
  11  */
  12
  13 // TODO JsDoc
  14
  15 /**
  16  * Create a cookie with the given key and value and other optional parameters.
  17  *
  18  * @example $.cookie('the_cookie', 'the_value');
  19  * @desc Set the value of a cookie.
  20  * @example $.cookie('the_cookie', 'the_value', { expires: 7, path: '/', domain: 'jquery.com', secure: true });
  21  * @desc Create a cookie with all available options.
  22  * @example $.cookie('the_cookie', 'the_value');
  23  * @desc Create a session cookie.
  24  * @example $.cookie('the_cookie', null);
  25  * @desc Delete a cookie by passing null as value. Keep in mind that you have to use the same path and domain
  26  *       used when the cookie was set.
  27  *
  28  * @param String key The key of the cookie.
  29  * @param String value The value of the cookie.
  30  * @param Object options An object literal containing key/value pairs to provide optional cookie attributes.
  31  * @option Number|Date expires Either an integer specifying the expiration date from now on in days or a Date object.
  32  *                             If a negative value is specified (e.g. a date in the past), the cookie will be deleted.
  33  *                             If set to null or omitted, the cookie will be a session cookie and will not be retained
  34  *                             when the the browser exits.
  35  * @option String path The value of the path atribute of the cookie (default: path of page that created the cookie).
  36  * @option String domain The value of the domain attribute of the cookie (default: domain of page that created the cookie).
  37  * @option Boolean secure If true, the secure attribute of the cookie will be set and the cookie transmission will
  38  *                        require a secure protocol (like HTTPS).
  39  * @type undefined
  40  *
  41  * @name $.cookie
  42  * @cat Plugins/Cookie
  43  * @author Klaus Hartl/klaus.hartl@stilbuero.de
  44  */
  45
  46 /**
  47  * Get the value of a cookie with the given key.
  48  *
  49  * @example $.cookie('the_cookie');
  50  * @desc Get the value of a cookie.
  51  *
  52  * @param String key The key of the cookie.
  53  * @return The value of the cookie.
  54  * @type String
  55  *
  56  * @name $.cookie
  57  * @cat Plugins/Cookie
  58  * @author Klaus Hartl/klaus.hartl@stilbuero.de
  59  */
  60 jQuery.cookie = function (key, value, options) {
  61
  62     // key and at least value given, set cookie...
  63     if (arguments.length > 1 && String(value) !== "[object Object]") {
  64         options = jQuery.extend({}, options);
  65
  66         if (value === null || value === undefined) {
  67             options.expires = -1;
  68         }
  69
  70         if (typeof options.expires === 'number') {
  71             var days = options.expires, t = options.expires = new Date();
  72             t.setDate(t.getDate() + days);
  73         }
  74
  75         value = String(value);
  76
  77         return (document.cookie = [
  78             encodeURIComponent(key), '=',
  79             options.raw ? value : encodeURIComponent(value),
  80             options.expires ? '; expires=' + options.expires.toUTCString() : '', // use expires attribute, max-age is not supported by IE
  81             options.path ? '; path=' + options.path : '',
  82             options.domain ? '; domain=' + options.domain : '',
  83             options.secure ? '; secure' : ''
  84         ].join(''));
  85     }
  86
  87     // key and possibly options given, get cookie...
  88     options = value || {};
  89     var result, decode = options.raw ? function (s) { return s; } : decodeURIComponent;
  90     return (result = new RegExp('(?:^|; )' + encodeURIComponent(key) + '=([^;]*)').exec(document.cookie)) ? decode(result[1]) : null;
  91 };