This Javascript cookie script works great so far, you just adjust when you would like the cookie to expire in the (expiresDays*24) line. However, I would like the cookie to expire when the browser is completely closed, but the cookie to persist whilst you are still on the site, even if you go to another webpage or reload the home page. I read this is doable and can be done with session cookies, by setting the value to 0 or no value, but being a learner on javascript, I am not sure how to do it, do any more experienced programmers know how to adjust the script below to do what I would like?
<script type="text/javascript">
function setCookie(cookieName, cookieValue, expireDays,isGlobal) {
var expireDate = new Date();
expireDate.setTime(expireDate.getTime() +
(expireDays*24*60*60*1000));
var expires = "expires="+expireDate.toUTCString();
if(isGlobal){
document.cookie = cookieName + "=" + cookieValue + "; " +
expires+"; path=/";
}else{
document.cookie = cookieName + "=" + cookieValue + "; " +
expires;
}
}
function getCookie(cookieName) {
var name = cookieName + "=";
var ca = document.cookie.split(';');
for(var i=0; i<ca.length; i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1);
if (c.indexOf(name) == 0) return c.substring(name.length,
c.length);
}
return "";
}
function checkCookie(cookieName) {
if (getCookie(cookieName) != "") {
return true;
} else {
return false;
}
}
</script>
I fixed this issue, all that was needed was to replace the values in this line:
from (expireDays*24*60*60*1000))
and change to:
(expireDays"=0"))
otherwise I left the scrip unchanged, the cookies lasts the duration of the visit to the website, including if you navigate around the site. But if you completely close the browser, the cookie expires.
How do I set and unset a cookie using jQuery, for example create a cookie named test and set the value to 1?
Update April 2019
jQuery isn't needed for cookie reading/manipulation, so don't use the original answer below.
Go to https://github.com/js-cookie/js-cookie instead, and use the library there that doesn't depend on jQuery.
Basic examples:
// Set a cookie
Cookies.set('name', 'value');
// Read the cookie
Cookies.get('name') => // => 'value'
See the docs on github for details.
Before April 2019 (old)
See the plugin:
https://github.com/carhartl/jquery-cookie
You can then do:
$.cookie("test", 1);
To delete:
$.removeCookie("test");
Additionally, to set a timeout of a certain number of days (10 here) on the cookie:
$.cookie("test", 1, { expires : 10 });
If the expires option is omitted, then the cookie becomes a session cookie and is deleted when the browser exits.
To cover all the options:
$.cookie("test", 1, {
expires : 10, // Expires in 10 days
path : '/', // The value of the path attribute of the cookie
// (Default: path of page that created the cookie).
domain : 'jquery.com', // The value of the domain attribute of the cookie
// (Default: domain of page that created the cookie).
secure : true // If set to true the secure attribute of the cookie
// will be set and the cookie transmission will
// require a secure protocol (defaults to false).
});
To read back the value of the cookie:
var cookieValue = $.cookie("test");
UPDATE (April 2015):
As stated in the comments below, the team that worked on the original plugin has removed the jQuery dependency in a new project (https://github.com/js-cookie/js-cookie) which has the same functionality and general syntax as the jQuery version. Apparently the original plugin isn't going anywhere though.
There is no need to use jQuery particularly to manipulate cookies.
From QuirksMode (including escaping characters)
function createCookie(name, value, days) {
var expires;
if (days) {
var date = new Date();
date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
expires = "; expires=" + date.toGMTString();
} else {
expires = "";
}
document.cookie = encodeURIComponent(name) + "=" + encodeURIComponent(value) + expires + "; path=/";
}
function readCookie(name) {
var nameEQ = encodeURIComponent(name) + "=";
var ca = document.cookie.split(';');
for (var i = 0; i < ca.length; i++) {
var c = ca[i];
while (c.charAt(0) === ' ')
c = c.substring(1, c.length);
if (c.indexOf(nameEQ) === 0)
return decodeURIComponent(c.substring(nameEQ.length, c.length));
}
return null;
}
function eraseCookie(name) {
createCookie(name, "", -1);
}
Take a look at
How do I remove an existing class name and add a new one with jQuery and cookies?
<script type="text/javascript">
function setCookie(key, value, expiry) {
var expires = new Date();
expires.setTime(expires.getTime() + (expiry * 24 * 60 * 60 * 1000));
document.cookie = key + '=' + value + ';expires=' + expires.toUTCString();
}
function getCookie(key) {
var keyValue = document.cookie.match('(^|;) ?' + key + '=([^;]*)(;|$)');
return keyValue ? keyValue[2] : null;
}
function eraseCookie(key) {
var keyValue = getCookie(key);
setCookie(key, keyValue, '-1');
}
</script>
You can set the cookies as like
setCookie('test','1','1'); //(key,value,expiry in days)
You can get the cookies as like
getCookie('test');
And finally you can erase the cookies like this one
eraseCookie('test');
Hope it will helps to someone :)
EDIT:
If you want to set the cookie to all the path/page/directory then set path attribute to the cookie
function setCookie(key, value, expiry) {
var expires = new Date();
expires.setTime(expires.getTime() + (expiry * 24 * 60 * 60 * 1000));
document.cookie = key + '=' + value + ';path=/' + ';expires=' + expires.toUTCString();
}
Thanks,
vicky
You can use a plugin available here..
https://plugins.jquery.com/cookie/
and then to write a cookie do
$.cookie("test", 1);
to access the set cookie do
$.cookie("test");
Here is my global module I use -
var Cookie = {
Create: function (name, value, days) {
var expires = "";
if (days) {
var date = new Date();
date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
expires = "; expires=" + date.toGMTString();
}
document.cookie = name + "=" + value + expires + "; path=/";
},
Read: function (name) {
var nameEQ = name + "=";
var ca = document.cookie.split(";");
for (var i = 0; i < ca.length; i++) {
var c = ca[i];
while (c.charAt(0) == " ") c = c.substring(1, c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
}
return null;
},
Erase: function (name) {
Cookie.create(name, "", -1);
}
};
Make sure not to do something like this:
var a = $.cookie("cart").split(",");
Then, if the cookie doesn't exist, the debugger will return some unhelpful message like ".cookie not a function".
Always declare first, then do the split after checking for null. Like this:
var a = $.cookie("cart");
if (a != null) {
var aa = a.split(",");
Here is how you set the cookie with JavaScript:
below code has been taken from https://www.w3schools.com/js/js_cookies.asp
function setCookie(cname, cvalue, exdays) {
var d = new Date();
d.setTime(d.getTime() + (exdays*24*60*60*1000));
var expires = "expires="+ d.toUTCString();
document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
}
now you can get the cookie with below function:
function getCookie(cname) {
var name = cname + "=";
var decodedCookie = decodeURIComponent(document.cookie);
var ca = decodedCookie.split(';');
for(var i = 0; i <ca.length; i++) {
var c = ca[i];
while (c.charAt(0) == ' ') {
c = c.substring(1);
}
if (c.indexOf(name) == 0) {
return c.substring(name.length, c.length);
}
}
return "";
}
And finally this is how you check the cookie:
function checkCookie() {
var username = getCookie("username");
if (username != "") {
alert("Welcome again " + username);
} else {
username = prompt("Please enter your name:", "");
if (username != "" && username != null) {
setCookie("username", username, 365);
}
}
}
If you want to delete the cookie just set the expires parameter to a passed date:
document.cookie = "username=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;";
A simple example of set cookie in your browser:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>jquery.cookie Test Suite</title>
<script src="jquery-1.9.0.min.js"></script>
<script src="jquery.cookie.js"></script>
<script src="JSON-js-master/json.js"></script>
<script src="JSON-js-master/json_parse.js"></script>
<script>
$(function() {
if ($.cookie('cookieStore')) {
var data=JSON.parse($.cookie("cookieStore"));
$('#name').text(data[0]);
$('#address').text(data[1]);
}
$('#submit').on('click', function(){
var storeData = new Array();
storeData[0] = $('#inputName').val();
storeData[1] = $('#inputAddress').val();
$.cookie("cookieStore", JSON.stringify(storeData));
var data=JSON.parse($.cookie("cookieStore"));
$('#name').text(data[0]);
$('#address').text(data[1]);
});
});
</script>
</head>
<body>
<label for="inputName">Name</label>
<br />
<input type="text" id="inputName">
<br />
<br />
<label for="inputAddress">Address</label>
<br />
<input type="text" id="inputAddress">
<br />
<br />
<input type="submit" id="submit" value="Submit" />
<hr>
<p id="name"></p>
<br />
<p id="address"></p>
<br />
<hr>
</body>
</html>
Simple just copy/paste and use this code for set your cookie.
You can use the library on Mozilla website here
You'll be able to set and get cookies like this
docCookies.setItem(name, value);
docCookies.getItem(name);
I think Fresher gave us nice way, but there is a mistake:
<script type="text/javascript">
function setCookie(key, value) {
var expires = new Date();
expires.setTime(expires.getTime() + (value * 24 * 60 * 60 * 1000));
document.cookie = key + '=' + value + ';expires=' + expires.toUTCString();
}
function getCookie(key) {
var keyValue = document.cookie.match('(^|;) ?' + key + '=([^;]*)(;|$)');
return keyValue ? keyValue[2] : null;
}
</script>
You should add "value" near getTime(); otherwise the cookie will expire immediately :)
Reducing the number of operations compared to previous answers, I use the following.
function setCookie(name, value, expiry) {
let d = new Date();
d.setTime(d.getTime() + (expiry*86400000));
document.cookie = name + "=" + value + ";" + "expires=" + d.toUTCString() + ";path=/";
}
function getCookie(name) {
let cookie = document.cookie.match('(^|;) ?' + name + '=([^;]*)(;|$)');
return cookie ? cookie[2] : null;
}
function eatCookie(name) {
setCookie(name, "", -1);
}
I thought Vignesh Pichamani's answer was the simplest and cleanest. Just adding to his the ability to set the number of days before expiration:
EDIT: also added 'never expires' option if no day number is set
function setCookie(key, value, days) {
var expires = new Date();
if (days) {
expires.setTime(expires.getTime() + (days * 24 * 60 * 60 * 1000));
document.cookie = key + '=' + value + ';expires=' + expires.toUTCString();
} else {
document.cookie = key + '=' + value + ';expires=Fri, 30 Dec 9999 23:59:59 GMT;';
}
}
function getCookie(key) {
var keyValue = document.cookie.match('(^|;) ?' + key + '=([^;]*)(;|$)');
return keyValue ? keyValue[2] : null;
}
Set the cookie:
setCookie('myData', 1, 30); // myData=1 for 30 days.
setCookie('myData', 1); // myData=1 'forever' (until the year 9999)
I know there are many great answers. Often, I only need to read cookies and I do not want to create overhead by loading additional libraries or defining functions.
Here is how to read cookies in one line of javascript. I found the answer in Guilherme Rodrigues' blog article:
('; '+document.cookie).split('; '+key+'=').pop().split(';').shift()
This reads the cookie named key, nice, clean and simple.
Try (doc here, SO snippet not works so run this one)
document.cookie = "test=1" // set
document.cookie = "test=1;max-age=0" // unset
Background
Cookies were originally invented by Netscape to give 'memory' to web servers and browsers. The HTTP protocol, which arranges for the transfer of web pages to your browser and browser requests for pages to servers, is state-less, which means that once the server has sent a page to a browser requesting it, it doesn't remember a thing about it. So if you come to the same web page a second, third, hundredth or millionth time, the server once again considers it the very first time you ever came there.
This can be annoying in a number of ways. The server cannot remember if you identified yourself when you want to access protected pages, it cannot remember your user preferences, it cannot remember anything. As soon as personalization was invented, this became a major problem.
Cookies were invented to solve this problem. There are other ways to solve it, but cookies are easy to maintain and very versatile.
How cookies work
A cookie is nothing but a small text file that's stored in your browser. It contains some data:
A name-value pair containing the actual data
An expiry date after which it is no longer valid
The domain and path of the server it should be sent to
Example
To set or unset cookies using Javascript, you can do the following:
// Cookies
function createCookie(name, value, days) {
if (days) {
var date = new Date();
date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
var expires = "; expires=" + date.toGMTString();
}
else var expires = "";
document.cookie = name + "=" + value + expires + "; path=/";
}
function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for (var i = 0; i < ca.length; i++) {
var c = ca[i];
while (c.charAt(0) == ' ') c = c.substring(1, c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
}
return null;
}
function setCookie(name, days) {
createCookie(name, name, days);
}
function unsetCookie(name) {
createCookie(name, "", -1);
}
You can access like below,
setCookie("demo", 1); // to set new cookie
readCookie("demo"); // to retrive data from cookie
unsetCookie("demo"); // will unset that cookie
The following code will remove all cookies within the current domain and all trailing subdomains (www.some.sub.domain.com, .some.sub.domain.com, .sub.domain.com and so on.).
A single line vanilla JS version (no need for jQuery):
document.cookie.replace(/(?<=^|;).+?(?=\=|;|$)/g, name => location.hostname.split('.').reverse().reduce(domain => (domain=domain.replace(/^\.?[^.]+/, ''),document.cookie=`${name}=;max-age=0;path=/;domain=${domain}`,domain), location.hostname));
This is a readable version of this single line:
document.cookie.replace(
/(?<=^|;).+?(?=\=|;|$)/g,
name => location.hostname
.split(/\.(?=[^\.]+\.)/)
.reduceRight((acc, val, i, arr) => i ? arr[i]='.'+val+acc : (arr[i]='', arr), '')
.map(domain => document.cookie=`${name}=;max-age=0;path=/;domain=${domain}`)
);
I know, there are plenty of answers already, but here's one that has set, get, and delete all beautifully vanilla and nicely put into a global reference:
window.cookieMonster = window.cookieMonster ||
{
// https://stackoverflow.com/a/25490531/1028230
get: function (cookieName) {
var b = document.cookie.match('(^|;)\\s*' + cookieName + '\\s*=\\s*([^;]+)');
return b ? b.pop() : '';
},
delete: function (name) {
document.cookie = '{0}=; Path=/; Expires=Thu, 01 Jan 1970 00:00:01 GMT;'
.replace('{0}', name);
},
set: function (name, value) {
document.cookie =
'{0}={1};expires=Fri, 31 Dec 9999 23:59:59 GMT;path=/;SameSite=Lax'
.replace('{0}', name)
.replace('{1}', value);
}
};
Notice cookie getting regex was taken from this answer to a question in another castle.
And let's test:
cookieMonster.set('chocolate', 'yes please');
cookieMonster.set('sugar', 'that too');
console.log(cookieMonster.get('chocolate'));
console.log(document.cookie);
cookieMonster.delete('chocolate');
console.log(cookieMonster.get('chocolate'));
console.log(document.cookie);
If you didn't have any cookies before trying, should give you...
yes please
chocolate=yes please; sugar=that too
sugar=that too
Notice the cookies last not quite heat-death-of-the-universe long, but essentially that from our perspective. You can figure out how to change dates pretty easily from looking at the strings here or from other answers.
How to use it?
//To set a cookie
$.cookie('the_cookie', 'the_value');
//Create expiring cookie, 7 days from then:
$.cookie('the_cookie', 'the_value', { expires: 7 });
//Create expiring cookie, valid across entire page:
$.cookie('the_cookie', 'the_value', { expires: 7, path: '/' });
//Read cookie
$.cookie('the_cookie'); // => 'the_value'
$.cookie('not_existing'); // => null
//Delete cookie by passing null as value:
$.cookie('the_cookie', null);
// Creating cookie with all availabl options
$.cookie('myCookie2', 'myValue2', { expires: 7, path: '/', domain: 'example.com',
secure: true, raw: true });
Available Options:
expires: Define lifetime of the cookie. Value can be a Number (which will be interpreted as days from time of creation) or a Date object. If omitted, the cookie is a session cookie.
path: Define the path where cookie is valid. By default the path of the cookie is the path of the page where the cookie was created (standard browser behavior). If you want to make it available for instance across the entire page use path: '/'.
domain: Domain of page where the cookie was created.
secure: Default: false. If true, the cookie transmission requires a secure protocol (https).
raw: By default the cookie is encoded/decoded when creating/reading, using encodeURIComponent/ decodeURIComponent. Turn off by setting raw: true.
I would like to be able to show a user a picture from one form page to the next. The picture will be dynamic based on what he or she is doing. So, I need to store the path link to that image in a cookie and then load that image on the next page.
How do I do that?
Check the plugin: https://github.com/carhartl/jquery-cookie
and then do:
$.cookie("img", img_url);
[OR]
You can set and get cookie using these functions: (From Quirksmode)
function createCookie(name, value, days) {
var expires;
if (days) {
var date = new Date();
date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
expires = "; expires=" + date.toGMTString();
} else {
expires = "";
}
document.cookie = escape(name) + "=" + escape(value) + expires + "; path=/";
}
function readCookie(name) {
var nameEQ = escape(name) + "=";
var ca = document.cookie.split(';');
for (var i = 0; i < ca.length; i++) {
var c = ca[i];
while (c.charAt(0) === ' ') c = c.substring(1, c.length);
if (c.indexOf(nameEQ) === 0) return unescape(c.substring(nameEQ.length, c.length));
}
return null;
}
Use document.cookie to set and get the image URLs.
check this cite for details: w3Schools
It shows that you didn't do much research on this simple thing.
Here's a very simple JSFiddle: fiddle
// Assign the cookie
document.cookie = "imgpath=/your/image.png";
alert(document.cookie);
// Use a regular expression to get the path from the entire cookie string. Sanitizations are left up to you.
var imgPath = /imgpath=([^;]+)/i.exec(document.cookie)[1];
alert(imgPath);
I suggest using the jQuery.cookie plugin mentioned in the other answers though, no need to make it any harder than it already is.
Here is the regular expression explained: http://regex101.com/r/qH6rB5/1 - it shows how the actual value you are interested in, is captured.
I'm having a huge problem with my code, I am trying to check if a cookie exists, and if it does exist, i dont want it to do anything.
Its working fine on page1, but when i navigate to page2 it overrides the cookie, instead of doing nothing (the pages is from the same website)
Heres my script
function setCookie(c_name, value, exdays) {
var exdate = new Date();
exdate.setDate(exdate.getDate() + exdays);
var c_value = escape(value) + ((exdays == null) ? "" : "; expires=" + exdate.toUTCString());
document.cookie = c_name + "=" + c_value;
}
function getCookie(c_name) {
var i, x, y, ARRcookies = document.cookie.split(";");
for (i = 0; i < ARRcookies.length; i++) {
x = ARRcookies[i].substr(0, ARRcookies[i].indexOf("="));
y = ARRcookies[i].substr(ARRcookies[i].indexOf("=") + 1);
x = x.replace(/^\s+|\s+$/g,"");
if (x == c_name) {
return unescape(y);
}
}
}
var omgpost = getCookie("omgpost");
if (omgpost == null || omgpost == "") {
setCookie("omgpost", "1", 1);
} else {
alert('cookie installed already');
}
This is working fine, when I don't have the cookie installed and entering this site, I'm adding the cookie, and I'm getting the confirmation message each time I refresh the page1.
But when navigating to page2 its recreating the cookie??? I don't want that! I want the cookie to be there, and can't be changed, only when it has expired, how can I do that?
Set Cookie Path using path=/
function setCookie(c_name,value,exdays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate() + exdays);
var c_value=escape(value) + ((exdays==null)
? "" : "; expires="+exdate.toUTCString())
+ "; path=/";
document.cookie=c_name + "=" + c_value;
}