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jQuery Set Get Delete Cookies Example

By Sam Deering

JavaScript

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jQuery can be used to manipulate browser cookies and this little demonstration shows you how to create, access and remove cookies using a jQuery plugin developed by Klaus Hartl under a GLP licence.

<html>
<head>
  <title>jquery cookie

  <script type="text/javascript" src="jquery-1.2.1.min.js">
  <script type="text/javascript" src="jquery.cookie.js">

  <script type="text/javascript">

    $(function($) {

      function displayMessage(msg) {
        $('#message').html(msg).css({color: 'green'});
      }

      displayMessage('jQuery cookie plugin test');

      $('#setSessionCookie').click(function() { 
        $.cookie('test', 'Hmmm, cookie');
        displayMessage("Cookie 'test' has been set.");
      });

      $('#setCookie').click(function() {
        $.cookie('test', 'Hmmm, cookie', { expires: 7 });
        displayMessage("Cookie 'test' has been set and will expire in 7 days.");
      });

      $('#getCookie').click(function() {
        displayMessage("The value of the cookie named 'test' is: " + $.cookie('test'));
      });

      $('#deleteCookie').click(function() {
        $.cookie('test', null);
        displayMessage("Cookie 'test' has been deleted.");
      });

      $('#testCookiesEnabled').click(function() {
        $.cookie('testcookiesenabled', null);
        $.cookie('testcookiesenabled', 'enabled');
        if ($.cookie('testcookiesenabled')) {
          displayMessage("Cookie: "+ $.cookie('testcookiesenabled'));
        } else {
          displayMessage("Cookies disabled");
          $.cookie('testcookiesenabled', null);
        }
      });

    });

  </script>

</head>

<body>

<p><span id="message" style="forecolor: red;">

</p><p><input type="button" id="testCookiesEnabled" value="Cookies enabled?"/>

<p><input type="button" id="setSessionCookie" value="Set session cookie"/&</p>
<p><input type="button" id="setCookie" value="Set cookie expires in  7 days"/></p>

<p><input type="button" id="getCookie" value="Show cookie value"/></p>

<p><input type="button" id="deleteCookie" value="Delete the cookie"/></p>

</body>
</html>

jquery.cookie.js

/**
* Cookie plugin
*
* Copyright (c) 2006 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
*
*/

/**
* Create a cookie with the given name and value and other optional parameters.
*
* @example $.cookie(‘the_cookie’, ‘the_value’);
* @desc Set the value of a cookie.
* @example $.cookie(‘the_cookie’, ‘the_value’, { expires: 7, path: ‘/’, domain: ‘jquery.com’, secure: true });
* @desc Create a cookie with all available options.
* @example $.cookie(‘the_cookie’, ‘the_value’);
* @desc Create a session cookie.
* @example $.cookie(‘the_cookie’, null);
* @desc Delete a cookie by passing null as value. Keep in mind that you have to use the same path and domain
* used when the cookie was set.
*
* @param String name The name of the cookie.
* @param String value The value of the cookie.
* @param Object options An object literal containing key/value pairs to provide optional cookie attributes.
* @option Number|Date expires Either an integer specifying the expiration date from now on in days or a Date object.
* If a negative value is specified (e.g. a date in the past), the cookie will be deleted.
* If set to null or omitted, the cookie will be a session cookie and will not be retained
* when the the browser exits.
* @option String path The value of the path atribute of the cookie (default: path of page that created the cookie).
* @option String domain The value of the domain attribute of the cookie (default: domain of page that created the cookie).
* @option Boolean secure If true, the secure attribute of the cookie will be set and the cookie transmission will
* require a secure protocol (like HTTPS).
* @type undefined
*
* @name $.cookie
* @cat Plugins/Cookie
* @author Klaus Hartl/klaus.hartl@stilbuero.de
*/

/**
* Get the value of a cookie with the given name.
*
* @example $.cookie(‘the_cookie’);
* @desc Get the value of a cookie.
*
* @param String name The name of the cookie.
* @return The value of the cookie.
* @type String
*
* @name $.cookie
* @cat Plugins/Cookie
* @author Klaus Hartl/klaus.hartl@stilbuero.de
*/
jQuery.cookie = function (name, value, options) {
if (typeof value != ‘undefined’) { // name and value given, set cookie
options = options || {};
if (value === null) {
value = ”;
options.expires = -1;
}
var expires = ”;
if (options.expires && (typeof options.expires == ‘number’ || options.expires.toUTCString)) {
var date;
if (typeof options.expires == ‘number’) {
date = new Date();
date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
} else {
date = options.expires;
}
expires = ‘; expires=’ + date.toUTCString(); // use expires attribute, max-age is not supported by IE
}
// CAUTION: Needed to parenthesize options.path and options.domain
// in the following expressions, otherwise they evaluate to undefined
// in the packed version for some reason…
var path = options.path ? ‘; path=’ + (options.path) : ”;
var domain = options.domain ? ‘; domain=’ + (options.domain) : ”;
var secure = options.secure ? ‘; secure’ : ”;
document.cookie = [name, ‘=’, encodeURIComponent(value), expires, path, domain, secure].join(”);
} else { // only name given, get cookie
var cookieValue = null;
if (document.cookie && document.cookie != ”) {
var cookies = document.cookie.split(‘;’);
for (var i = 0; i < cookies.length; i++) { var cookie = jQuery.trim(cookies[i]); // Does this cookie string begin with the name we want? if (cookie.substring(0, name.length + 1) == (name + '=')) { cookieValue = decodeURIComponent(cookie.substring(name.length + 1)); break; } } } return cookieValue; } }; [/js]

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Sam Deering has 15+ years of programming and website development experience. He was a website consultant at Console, ABC News, Flight Centre, Sapient Nitro, and the QLD Government and runs a tech blog with over 1 million views per month. Currently, Sam is the Founder of Crypto News, Australia.

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