114 lines
4 KiB
JavaScript
114 lines
4 KiB
JavaScript
/**
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* @fileOverview Accessing cookies from JavaScript
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* @license GPLv2 or later
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*/
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/*
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* Based on subsection "Cookies in JavaScript" of "Professional
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* JavaScript for Web Developers" by Nicholas C. Zakas and cookie
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* plugin from jQuery (dual licensed under the MIT and GPL licenses)
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*/
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/**
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* Create a cookie with the given name and value,
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* and other optional parameters.
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*
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* @example
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* setCookie('foo', 'bar'); // will be deleted when browser exits
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* setCookie('foo', 'bar', { expires: new Date(Date.parse('Jan 1, 2012')) });
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* setCookie('foo', 'bar', { expires: 7 }); // 7 days = 1 week
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* setCookie('foo', 'bar', { expires: 14, path: '/' });
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*
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* @param {String} sName: Unique name of a cookie (letters, numbers, underscores).
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* @param {String} sValue: The string value stored in a cookie.
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* @param {Object} [options] An object literal containing key/value pairs
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* to provide optional cookie attributes.
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* @param {String|Number|Date} [options.expires] Either literal string to be used as cookie expires,
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* or an integer specifying the expiration date from now on in days,
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* or a Date object to be used as cookie expiration date.
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* If a negative value is specified or a date in the past),
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* the cookie will be deleted.
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* If set to null or omitted, the cookie will be a session cookie
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* and will not be retained when the browser exits.
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* @param {String} [options.path] Restrict access of a cookie to particular directory
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* (default: path of page that created the cookie).
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* @param {String} [options.domain] Override what web sites are allowed to access cookie
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* (default: domain of page that created the cookie).
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* @param {Boolean} [options.secure] If true, the secure attribute of the cookie will be set
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* and the cookie would be accessible only from secure sites
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* (cookie transmission will require secure protocol like HTTPS).
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*/
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function setCookie(sName, sValue, options) {
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options = options || {};
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if (sValue === null) {
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sValue = '';
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option.expires = 'delete';
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}
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var sCookie = sName + '=' + encodeURIComponent(sValue);
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if (options.expires) {
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var oExpires = options.expires, sDate;
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if (oExpires === 'delete') {
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sDate = 'Thu, 01 Jan 1970 00:00:00 GMT';
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} else if (typeof oExpires === 'string') {
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sDate = oExpires;
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} else {
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var oDate;
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if (typeof oExpires === 'number') {
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oDate = new Date();
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oDate.setTime(oDate.getTime() + (oExpires * 24 * 60 * 60 * 1000)); // days to ms
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} else {
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oDate = oExpires;
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}
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sDate = oDate.toGMTString();
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}
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sCookie += '; expires=' + sDate;
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}
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if (options.path) {
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sCookie += '; path=' + (options.path);
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}
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if (options.domain) {
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sCookie += '; domain=' + (options.domain);
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}
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if (options.secure) {
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sCookie += '; secure';
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}
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document.cookie = sCookie;
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}
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/**
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* Get the value of a cookie with the given name.
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*
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* @param {String} sName: Unique name of a cookie (letters, numbers, underscores)
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* @returns {String|null} The string value stored in a cookie
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*/
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function getCookie(sName) {
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var sRE = '(?:; )?' + sName + '=([^;]*);?';
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var oRE = new RegExp(sRE);
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if (oRE.test(document.cookie)) {
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return decodeURIComponent(RegExp['$1']);
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} else {
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return null;
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}
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}
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/**
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* Delete cookie with given name
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*
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* @param {String} sName: Unique name of a cookie (letters, numbers, underscores)
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* @param {Object} [options] An object literal containing key/value pairs
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* to provide optional cookie attributes.
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* @param {String} [options.path] Must be the same as when setting a cookie
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* @param {String} [options.domain] Must be the same as when setting a cookie
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*/
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function deleteCookie(sName, options) {
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options = options || {};
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options.expires = 'delete';
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setCookie(sName, '', options);
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}
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/* end of cookies.js */
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