Logo         Community
The Company
Your Account
Contact Us
Using Cookies With JavaScript
Store and retrieve persistent data with cookies in JavaScript

| What's In A Name? |

It's not very difficult to create custom cookie-handling code - after all, all you're really doing is parsing and manipulating a set of values in an encoded string. JavaScript makes it even easier by exposing a "document.cookie" element that does most of the dirty work for you - all you need to do is give it the cookie data to be written. Consider the following example, which illustrates:


<script language = "JavaScript">
<!-- start hiding
function writeCookie()

// ask for input
var name = prompt("What's your name?", "");

// set expiry date
var d = new Date("January 31, 2004");
var cd = d.toGMTString();

// set cookie parameters
var c = "username=" + escape(name) + ";expires=" + cd;

// write cookie
document.cookie = c;

// stop hiding -->


<body onLoad="writeCookie()">


Most of this is pretty simple - the prompt() method takes care of popping up a box for user input, and the corresponding value is encoded into the cookie string for storage. Similarly, a Date object is instantiated with the cookie's expiry date, converted to the requisite format using the Date object's toGMTString() method and the resulting value is added to the cookie string as part of the "expires" attribute explained earlier. Once the cookie string is ready, the "document.cookie" property takes care of writing it to a file.

Now, try running the code above in your browser. You should see an input box. Enter your name into the box. The value you entered into the box should now be saved as a cookie to your hard drive. If you're the suspicious type, verify this by looking in your browser's cookies directory - you should see a cookie with contents like this:

''.preg_replace(array('/  /', '/ /'), array('  ', '   '), '

How to do Everything with PHP & MySQL
How to do Everything with PHP & MySQL, the best-selling book by Melonfire, explains how to take full advantage of PHP's built-in support for MySQL and link the results of database queries to Web pages. You'll get full details on PHP programming and MySQL database development, and then you'll learn to use these two cutting-edge technologies together. Easy-to-follow sample applications include a PHP online shopping cart, a MySQL order tracking system, and a PHP/MySQL news publishing system.

Read more, or grab your copy now!

previous page more like this  print this article  next page
In trog...
Logging With PHP
Building A Quick-And-Dirty PHP/MySQL Publishing System
Output Buffering With PHP
Date/Time Processing With PHP
Creating Web Calendars With The PEAR Calendar Class
In the hitg report...
Crime Scenes
Animal Attraction
Lord Of The Strings
In boombox...
Patience - George Michael
Think Tank - Blur
My Private Nation - Train
In colophon...
Hostage - Robert Crais
The Dead Heart - Douglas Kennedy
Right As Rain - George Pelecanos
In cut!...
American Chai
The Core
Find out how you can use this article on your own Web site!

Copyright © 1998-2018 Melonfire. All rights reserved
Terms and Conditions | Feedback