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JavaScript redirect back to refer page

I am trying to make a button OR direct redirect which redirect user to page where he come from.
For example: If someone access my website from bbc post and register. Upon register success page, There should be a button or redirect function which take user back to bbc post or whereever he comes from.
I tried following cookie method but not worked also read some posts on stackoverlow but still no luck!
function setCookie(name,val,days) {
// DATE OBJECT
var date = new Date();
// NUMBER OF MILLISECONDS IN A DAY
var milliseconds = 86400000;
// MULTIPLY, THEN ADD TO CURRENT TIME
date.setTime(date.getTime() + (days * milliseconds));
// SET EXPIRATION VARIABLE
var expires = '; expires=' + date.toGMTString();
// CONCATENATE TO CREATE COOKIE
document.cookie = name + '=' + val + expires + '; path=/';
}
window.onload = function(){
if(document.referrer != ''){
// DESTROY ANY PREVIOUS DUPLICATE COOKIE
setCookie('referrer','',-1);
// CREATE COOKIE ON REGISTRATION PAGE
setCookie('referrer',document.referrer,1);
}
}
Can someone give any solution for this?

You can use the following and it should be useable in used even if the tab is opened in a new window.
if(document.referrer != ''){
// DESTROY ANY PREVIOUS DUPLICATE COOKIE
setCookie('referrer','',-1);
// CREATE COOKIE ON REGISTRATION PAGE
setCookie('referrer',document.referrer,1);
document.location.replace(document.referrer);
//replaces current url with new one eg. the (current) url is removed from history
//or
document.location.href = document.referrer;
//(current) url is in history/can use back button to go to previous page
}

Bookmarklet for set and read cookies

I need (for practice) to set a cookie via bookmarklet in website X, and read him with another bookmarklet from website Y.
For example, set a cookie named "user" with value of "Guy" in Google, and read this from YouTube.
I managed to set the cookie, but can't think of any idea how to read him from website b.
Thanks!

You need two bookmarklets, a getter and a setter.
You go to site X and use the getter bookmarklet to read the cookie and let the user copy it to his clipboard.
Then you go to site Y and use the setter. The setter will prompt the user for the bookmarklet and the user will then paste it into the prompt. The code will then set the cookie accordingly.
You can of course combine these two bookmarklets into a single getter/setter. The prompt will contain the current cookie for the page. The user can then choose to either copy the cookie and cancel (using it as a getter) or choose to to alter the cookie and click "OK" (using it as a setter).

I was looking for a way to share cookies of a specific website with a friend (reading them in my browser via bookmarklet and my friend setting them on his browser also via bookmarklet). Not quite what you asked for, but searching brought me here. This is my approach:
First there is a bookmarklet for exporting cookies. It will remove unnecessary white-spaces and encode your data in a base64 string for safe transport:
javascript:(
function(){
prompt("GET cookies encoded in base64", btoa(document.cookie.replace(/\s/ig, "")));
}
)
();
Then there is a second bookmarklet for importing all cookies encoded in the string. You can also set an optional lifetime here (thanks to https://www.quirksmode.org/js/cookies.html):
javascript:(
function(){
var inputstring = prompt("SET cookies decoded from base64");
var inputclean = atob(inputstring).replace(/\s/ig, "");
if (confirm("These cookies will be imported:\n\n" + inputclean.replace(/;/ig, "; "))) {
var days = prompt("Cookie lifetime in full days", "365");
var cookiearray = inputclean.split(";");
cookiearray.forEach(function(entry) {
var expires = "";
var split = entry.split("=");
if (days) {
var date = new Date();
date.setTime(date.getTime() + (days*24*60*60*1000));
expires = "; expires=" + date.toUTCString();
}
document.cookie = split[0] + "=" + (split[1] || "") + expires + "; path=/";
});
}
}
)
();
Do not forget you have to run those on a specific website or tab. It does NOT export the entire collection of the cookies your browser is storing.

According to this StackOverflow, how to get cookies from a different domain with php and javascript you can't get cookies from another domain UNLESS you have access to it, as it would be a huge security flaw.

javascript to raise popup window on third page accessed

After a person has toured my website for N pages, I would like to raise a popup window asking them if they would like to subscribe to my newsletter.
I've found sample code to raise a popup after a delay of some seconds, I've found samples for asking only once, but not one that can track the number of pages traversed.
Where can I find sample JS code to raise a window after a certain number of pages have been traversed?
My simple minded analysis is that normally each invocation of the script on N pages would be a different invocation, and hence would not have any record of the previous page's invocation. So each copy would have to read a cookie set by the previous copy, increment it, and store back. Then, when N=3 and whatever other conditions I think are appropriate are satisified, the popup is triggered.

Your analysis is correct! You'll need cookies of some sort, whether tracked server side or just good old fashioned javascript cookies.
Here's the best rundown I've seen of how to implement them: Quirksmode 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 eraseCookie(name) {
createCookie(name,"",-1);
}
To update the value of the cookie to track page count - again assuming you aren't doing this server-side - you'll need to reset the cookie and set a new one with the new value. Updating/changing a value of an existing cookie just isn't really a supported operation of cookies.
Or you could just create 3 cookies, I guess. Whatever floats your integer ;)

On clicking Links do a push to the HTML5 history API and check length of history. You may also add an eventhandler to all links on your page.
//first 2 paraemeters could be NULL, last is the URL
history.pushState(data, event.target.textContent, event.target.href);
//check length of history
history.length
more abouth HML5 history API: http://html5doctor.com/history-api/
Edit: actually you should not need the push event for ordinary Links, just test it with console.log(history.length);

Javascript cookies and redirect

I need help changing this code so that the cookie only last through the session instead of 1 year forward. What changes do I need to make?
function createCookie(name,value,) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000*365));
var expires = "; expires="+date.toGMTString();
}
else var expires = "";
document.cookie = name+"="+value+expires+"; path=/";
}
I tried to do this, but it doesn't seem to work. Cookie is created but doesn't disappear after session closes.
function createCookie(name,value) {
document.cookie = name+"="+value+"; path=/";
}
--- Update ---
I made some small changes to the code:
function createCookie(name,value,expires) {
var expires = "";
document.cookie = name+"="+value+expires+"; path=/";
}
Now I was using Chrome, and it didn't work with the code I had and it doesn't work with this code either. But this code works in IE, Firefox and Opera. The cookie is deleted when the session is over, but not in Chrome...

Chrome since the version 19 had made a breakthrough change regarding the handling of session cookie. In order to improve the user experience the session cookie will not be removed.
If I understood correctly, since the option set in chrome settings say: "Continue where I left off", the session cookie never expires.
Please look at:
Chrome doesn't delete session cookies

If you are using Chrome or Firefox then set expires to 0, if you are using IE then leave out the expires parameter all together.

One Cookie - Multiple Pages

I am using the following cookie:
var $j = jQuery.noConflict();
$j(document).ready(function(){
if (document.cookie.indexOf('visited=true') == -1)
{
var thirtyDays = 1000*60*60*24*30;
var expires = new Date((new Date()).valueOf() + thirtyDays);
document.cookie = "visited=true;expires=" + expires.toUTCString();
$j.colorbox({ inline:true, href:"#gallery-nav-instruct"});
}
});
Everything works fine with one exception. The above cookie is for displaying instructions the first time a user visit the gallery yet the gallery has multiple pages. What happens is the user sees the instructions for each page in the gallery the first time they visit that specific page. These instructions need to load only once when they visit the gallery no matter which page they start on. How do I go about changing this so it displays only once across my gallery pages?
Couple Notes:
The gallery is wrapped inside a Dreamweaver Template and the cookie is inside that template. I cannot move the cookie outside of the template for a few reasons.
Also I use a hosted CMS and I DO NOT have server side access so it must be done using javascript.

Add ;path=/ to make your cookie into a site cookie. See this article on JavaScript Cookies for more details.

document.cookie = valuename + "=" + value + "; " + expires + ";domain=;path=/";
This "domain=;path=/"; will take dynamic domain as its cookie will work in subdomain.
It will work if you want to test in localhost.