Set, read, delete Cookies with JavaScript November 12, 2012

On this page I give three functions to save, read and erase cookies with JavaScript (No need jQuery). Using these functions you can manage cookies on your site.

The function is document.cookie and 3 functions is:

1. setCookie():

function setCookie(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=/';
}

• name: the cookie name
• value: value of this cookie
• days: cookie expires

2. readCookie(name)

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;
}

• name: the cookie name
• this function return a string

3. deleteCookie():

function deleteCookie(name) {
 setCookie(name,'',-1);
}