Some Web sites stored some information with a small text file in user hard disk , these files are known as cookies. In JavaScript cookie is a property of document object. JavaScript provides comprehensive access rights of Cookies.
Before continuing, we need to learn the basic of a cookie.
Each Cookie has an expiry date, once the computer clock cross the expiration date, the cookie will be deleted. We can not directly delete a cookie, but you can set the expiration date earlier to indirectly delete it.
Each page, or that each site has its own cookies, these cookies can only access by this site's pages and pages from other sites or the same site, an unauthorized region i.e. from a different browser can not access .
Now we will learn to use the document.cookie property .
If you directly use the document.cookie property, or, in some way, for example, assign the variables to the value of document.cookie, we can know how many Cookies are in the present document, the name of each Cookies, and its value. For example, in a document to add document.write (document.cookie) ", the results showed that:
document.cookie="NAME=VALUE; expires=DATE; path=PATH; domain=DOMAIN; secure";
name and value : The first part of the cookie string must have the name and value.
encodeURIComponent() and decodeURIComponent() functions.
To ensure that cookie value string does not contain any commas, semicolons, or whitespace characters use encodeURIComponent () function. Use decodeURIComponent() function is used to decode the encoded string by encodeURIComponent() functions.
expires : To give more life to the cookies you must set an expiration date in the following format. DD-Mon-YY HH:MM:SS GMT
Here is an example where the cookie will live upto Sun, 12 Jun 2012:00:00:00 GMT
path : To set a cookie in a specified path called 'backup' under root use the following command.
document.cookie= "VisiterName=George;expires=Mon,12Jun2011:00:00:00"
+ ";path=/backup;"; domain : To set the cookie in a domain name myexample.com
Reference : Mozilla Developer Network : w3resource Javascript Cookies, Reading cookie, Create cookie.
Before continuing, we need to learn the basic of a cookie.
Each Cookie has an expiry date, once the computer clock cross the expiration date, the cookie will be deleted. We can not directly delete a cookie, but you can set the expiration date earlier to indirectly delete it.
Each page, or that each site has its own cookies, these cookies can only access by this site's pages and pages from other sites or the same site, an unauthorized region i.e. from a different browser can not access .
Now we will learn to use the document.cookie property .
If you directly use the document.cookie property, or, in some way, for example, assign the variables to the value of document.cookie, we can know how many Cookies are in the present document, the name of each Cookies, and its value. For example, in a document to add document.write (document.cookie) ", the results showed that:
document.cookie="NAME=VALUE; expires=DATE; path=PATH; domain=DOMAIN; secure";
name and value : The first part of the cookie string must have the name and value.
encodeURIComponent() and decodeURIComponent() functions.
To ensure that cookie value string does not contain any commas, semicolons, or whitespace characters use encodeURIComponent () function. Use decodeURIComponent() function is used to decode the encoded string by encodeURIComponent() functions.
expires : To give more life to the cookies you must set an expiration date in the following format. DD-Mon-YY HH:MM:SS GMT
Here is an example where the cookie will live upto Sun, 12 Jun 2012:00:00:00 GMT
path : To set a cookie in a specified path called 'backup' under root use the following command.
document.cookie= "VisiterName=George;expires=Mon,12Jun2011:00:00:00"
+ ";path=/backup;"; domain : To set the cookie in a domain name myexample.com
Reference : Mozilla Developer Network : w3resource Javascript Cookies, Reading cookie, Create cookie.
