Cookie set, delete, get value and create

  
/*
JavaScript Application Cookbook
By Jerry Bradenbaugh

Publisher: O'Reilly 
Series: Cookbooks
ISBN: 1-56592-577-7
*/ 

 
<HTML>
<HEAD>
<TITLE>cookie set, delete, get value and create</TITLE>
<SCRIPT LANUAGE="JavaScript">
// cookies.js
// Derived from the Bill Dortch code at http://www.hidaho.com/cookies/cookie.txt

var today = new Date();
var expiry = new Date(today.getTime() + 365 * 24 * 60 * 60 * 1000);

function getCookieVal (offset) {
  var endstr = document.cookie.indexOf (";", offset);
  if (endstr == -1) { endstr = document.cookie.length; }
  return unescape(document.cookie.substring(offset, endstr));
  }

function GetCookie (name) {
  var arg = name + "=";
  var alen = arg.length;
  var clen = document.cookie.length;
  var i = 0;
  while (i < clen) {
    var j = i + alen;
    if (document.cookie.substring(i, j) == arg) {
      return getCookieVal (j);
      }
    i = document.cookie.indexOf(" ", i) + 1;
    if (i == 0) break; 
    }
  return null;
  }

function DeleteCookie (name,path,domain) {
  if (GetCookie(name)) {
    document.cookie = name + "=" +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    "; expires=Thu, 01-Jan-70 00:00:01 GMT";
    }
  }

function SetCookie (name,value,expires,path,domain,secure) {
  document.cookie = name + "=" + escape (value) +
    ((expires) ? "; expires=" + expires.toGMTString() : "") +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    ((secure) ? "; secure" : "");
  }
</SCRIPT>

</HEAD>
<BODY BGCOLOR=WHITE>

<SCRIPT LANGUAGE="JavaScript">
<!--

if (GetCookie('user_id') == null) {
  var getName = prompt('Hi... First time, huh?? We all have to  through it. Please enter your name.', '');
  document.writeln('<H2>Welcome, ' + (getName != '' ? getName : 'Anonymous user') + '</H2>' + 
    'This is your first visit.');
  SetCookie('user_id', (getName != '' ? getName : 'Anonymous user'), expiry);
  SetCookie('hit_count', '2', expiry);
  }
else {
  var getName = GetCookie('user_id');
  var getHits = GetCookie('hit_count');
  document.writeln('<H2>Welcome Back, ' + getName + '</H2>' + 
    'You have visited ' + getHits + ' times.');
  getHits = parseInt(getHits) + 1;
  SetCookie('hit_count', '' + getHits + '', expiry);
  }

//-->
</SCRIPT>

</BODY>
</HTML>

1.	Reads, writes and deletes current Web page's cookies
2.	'cookieEnabled' Example
3.	Create a cookie
4.	Set the cookie expire date
5.	Secure cookie
6.	Read all cookies
7.	Standard cookie functions: extract Cookie Value
8.	Save name to cookie
9.	Cookie utility function
10.	Cookie install and delete (remove)
11.	Cookie: retrieve a future expiration date in proper format
12.	A Cookie Example
13.	A Cookie Test Program
14.	Quiz Program base on Cookie
15.	A Website Access Counter
16.	Keeping Track of User Access Time
17.	Bill Dortch's Cookie Functions
18.	Cookie Preferences
19.	Set cookie to document and read it back

Cookie set, delete, get value and create : Cookie « Development « JavaScript DHTML

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