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It is very common for a website to use cookies. Cookies are a small snippet of data that is stored on the client’s machine. Cookies can store anything from user information to session data. You will learn how to create, retrieve, display and delete cookies using javascript.

The piece of code we will be writing, using the YUI library (my favorite), will allow users to increase/decrease their font size for a block of text, storing the font size in a cookie so that when they return to the page they don't have to modify the font size again.

User Name Cookie

ID Tracker

Only Popup Once

Name - Visits - Last Visit

Favorite Background Cookie

Name - Browser Info

Ever wonder how web sites could say, "This page will refresh after every 60 seconds." Without having the surfer press refresh? Well, the answer is in Javascript!

Session-only cookies

Cookies

A cookie is a way you can store some information about a user visiting your site. The information is stored on the individuals computer, and thus you do not need any extra server space to customize a page for any amount of users you may have. To use Cookies there are two things you need to do, one is set the cookie, and the other is retrieve a cookie you have already set. Here's a brief tutorial on how to use cookies, and a couple of ideas which you can use cookies for.

Use a few simple lines of JavaScript to verify if cookies are accepted by the target web browser.

If your script relies on JavaScript cookies to store and persist information, it's a good idea to always make sure the user's browser has cookies enabled first. This tutorial shows you how to perform this detection.

Using cookies, this script records the date+time of your visitor's last visit and displays it upon their return. If this is their first visit to your site, a greeting message is shown instead.

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