Develop Reference

Script to change cookie expiration to 6 months

I'm definitely new to Javascript, but I need to implement a tag within GTM to update 2 cookie values to 6 months for any unique user after the are loaded on the page.
I have the following script to alter the expiration date:
<script>
function getCookie(name) {
var value = "; " + document.cookie;
var parts = value.split("; " + name + "=");
if (parts.length == 2)
return parts.pop().split(";").shift();
}
var date = new Date();
date.setTime(date.getTime()+(365*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
console.log("expires: " + expires);
var cookieName = "CookieA";
var OABCcookieName = "CookieB";
function updateCookieExpiration() {
var cookie = getCookie(cookieName);
document.cookie = cookieName + "=" + cookie + expires + ";path=/; Samesite=Lax;" //domain=" + domain + ";";
var OABCcookie = getCookie(OABCcookieName);
document.cookie = OABCcookieName + "=" + OABCcookie + expires + ";path=/; Samesite=Lax;" //domain=" + domain + ";";
}
</script>
My question is, if I add the following script, update 365 to 180, and call the updateCookieExpiration() function - won't the function be called on every page and cause the cookie expiration to always reset to 6 months?
If so, is there additional logic that I need to add to make sure the cookie expiration hasn't already been reset for a unique visitor, to avoid the scenario described?
Any help troubleshooting would be great and very appreciated!

You could add a condition check if the Cookie name already exist:
// You may prefer using max-age here
const sixMonthMaxAge = 60 * 60 * 24 * 180;
var newCookieName = "CookieA";
function updateCookieExpiration() {
const cookie = getCookie(cookieName);
// If cookie doesn't exist
if(!cookie) {
document.cookie = cookieName + "=" + cookie + ";" + "max-age=" sixMonthMaxAge + ";"
}
}
Using js-cookie library
Using library that abstract Cookie management can be a good idea, even more if you have to manager multiple cookies.
import Cookies from 'js-cookie'
const sixMonthMaxAge = 180; // You can provide the max-age in days
var newCookieName = "CookieA";
function updateCookieExpiration() {
const cookie = Cookies.get(cookieName);
if(!cookie) {
Cookie.set(cookieName, 'your_value', { expires: sixMonthMaxAge })
}
}
Cookies.set('foo', 'bar')

Cookies aren't available on new window on localhost

I'm using the following code to set a cookie
function setCookie(key, value) {
var expires = new Date();
expires.setTime(expires.getTime() + (1 * 24 * 60 * 60 * 1000));
document.cookie = key + '=' + value + ';expires=' + expires.toUTCString();
}
setCookie('test', '1');
The code is setting the cookie correctly (inspect element reveals the cookie has been set), however only on the page that the cookie is being set. I'm trying to open a new browser window and use that cookie value, however, it won't read the cookie.
I'm also on localhost on my local machine, so I believe that's where the error lies.
How can I fix it so that the cookie I set can be used across all pages on localhost?

this works for me
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=/";
}
setCookie('test', 'Bond007', 365);

Cannot set cookie to expire on browser close

I'm trying to set a cookie using javascript so it expires when the browser is closed.
I have the following function to do that:
function createCookie(value,days) {
var name = "name";
var expires = "";
if (days) {
var date = new Date();
date.setTime(date.getTime() + (days*24*60*60*1000));
expires = "; expires=" + date.toUTCString();
}
var cookie = name + "=" + value + expires + "; path=/";
document.cookie = cookie;
}
I tried many ways found here and there on the web like setting the date to "", setting it to yesterday (in that case the cookie is not even added) and omitting "expires" completly. I tried on Firefox and Chrome checking that every process was stopped before opening again, but the cookie is alway there.
What am I missing?

I am using this function for my self. It will work for you i gess :)
function createCookie(name, value, expiresInX_days, path) {
var a = new Date;
var expires = expiresInX_days || 1;
a.setTime(Date.now() + (1000 * 60 * 60 * 24 * expires));
var pt = path ? " ; path=" + path + ";" : ";";
return (document.cookie = name + "=" + value + ";" + "expires=" + a.toUTCString() + pt) ? !0 : !1;
}

If you want to delete your cookie, you can use this:
function rmCookie(cookieName){
var a = new Date;
a.setTime(0);
return (document.cookie = cookieName + "=;" + a.toUTCString()) ? !0 : !1;
}
If you want get your cookie clean,
function getMyFuckingCookie(cookieName){
var a = document.cookie.replace(/; /g, ";").split(";"),
b = a.length,
c = {},
nm = cookieName || !1;
while (b--) {
var d = a[b].split(/=(.+)/);
c[d[0]] = d[1];
}
return (nm) ? c[nm] : c;
}

add a variable when setting a javascript cookie

I've been trying to add a variable when setting a cookie but no luck. The cookie is created but the value is not passed and it appears as +content+
function createCookie(name, value, expires, path, domain) {
var cookie = name + "=" + value + ";";
if (expires) {
// If it's a date
if(expires instanceof Date) {
// If it isn't a valid date
if (isNaN(expires.getTime()))
expires = new Date();
}
else
expires = new Date(new Date().getTime() + parseInt(expires) * 1000 * 60 * 60 * 24);
cookie += "expires=" + expires.toGMTString() + ";";
}
if (path)
cookie += "path=" + path + ";";
if (domain)
cookie += "domain=" + domain + ";";
document.cookie = cookie;
}
function updateCookie(){
var content = "value of cookie";
createCookie("newcookie", "+content+", new Date(new Date().getTime() + 10000));
}

I think you want
var content = "value of cookie";
createCookie("newcookie", content , new Date(new Date().getTime() + 10000));

Set Expires Time in Cookie Javascript

I have a string that I use to set expires date in cookie. But I always fail to set it. Here is my Code:
var expTime = '2016-06-09T03:06:53Z';
var valueCookie = 'test';
SetCookie('myCookie', valueCookie, expTime);
function SetCookie(name, value, expTime) {
document.cookie = name + '=' + value + '; ' 'expires=' + expTime+ '; path=/';
};
Why I fail to set Expire Date in Cookie?
Thanks

try this
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;
}
The parameters of the function above are the name of the cookie (cname), the value of the cookie (cvalue), and the number of days until the cookie should expire (exdays).
The function sets a cookie by adding together the cookiename, the cookie value, and the expires string.

here is my code
function setCookie(name,value,data){
var oDate =new Date();
    oDate.setDate(oDate.getDate()+data);
    document.cookie=name+'='+value+';expires='+oDate;
}

I think there is a syntax error.Try this
var expTime = '2016-06-09T03:06:53Z';
var valueCookie = 'test';
SetCookie('myCookie', valueCookie, expTime);
function SetCookie(name, value, expTime) {
document.cookie = name + '=' + value + '; expires=' + expTime+ '; path=/';
}