Feb 19th, 2014 at 03:39 PM

Create, update, and delete JavaScript Cookie

What is Cookie? Cookies are data, stored in small text files, on your computer. Cookies are saved in name-value pairs like: username=Jahidul Islam Create a Cookie with JavaScript Make a simple cookie just assigning name-value pair

 document.cookie="username=Jahidul Islam";

Making a cookie with the expiry date

document.cookie="username=Jahidul Islam; expires=Thu, 18 Dec 2060 12:00:00 GMT";

Making cookie with expiry date and the path where cookie belongs to. By default, the cookie belongs to the current page.

document.cookie="username=Jahidul Islam; expires=Thu, 18 Dec 2013 12:00:00 GMT; path=/";

Read a Cookie with JavaScript

var x = document.cookie;

document.cookie will return all cookies in one string much like: cookie1=value; cookie2=value; cookie3=value; Change a Cookie with JavaScript you can change a cookie the same way as you create it:

document.cookie="username=Jahidul Islam Jahid; expires=Thu, 18 Dec 2013 12:00:00 GMT; path=/";

Delete a Cookie with JavaScript Deleting a cookie is very simple. Just set the expires parameter to a passed date:

document.cookie = "username=; expires=Thu, 01 Jan 1970 00:00:00 GMT";

Example

<!DOCTYPE html>
<html>
<head>

<script>

function setCookie(cname,cvalue,exdays){
	var d = new Date();
	d.setTime(d.getTime()+(exdays*24*60*60*1000));
	var expires = "expires="+d.toGMTString();
	document.cookie = cname+"="+cvalue+"; "+expires;
}

function getCookie(cname){
	var name = cname + "=";
	var ca = document.cookie.split(';');
	for(var i=0; i<ca.length; i++) 
	  {
	  var c = ca[i].trim();
	  if (c.indexOf(name)==0) return c.substring(name.length,c.length);
	  }
	return "";
}

function checkCookie(){
	var user=getCookie("username");
	if (user!="")
	  {
	  alert("Welcome again " + user);
	  }
	else 
	  {
	  user = prompt("Please enter your name:","");
	  if (user!="" && user!=null)
		{
		setCookie("username",user,30);
		}
	  }
}

</script>
</head>

<body onload="checkCookie()">
</body>
</html>

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Create, update, and delete JavaScript Cookie

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