What are Cookies?
Cookies are data, stored in small text files, on your computer.
When a web server has sent a web page to a browser, the connection is shut down, and the server forgets everything about the user.
Cookies were invented to solve the problem "how to remember information about the user":
- When a user visits a web page, his name can be stored in a cookie.
- Next time the user visits the page, the cookie "remembers" his name.
Cookies are saved in name-value pairs like:
username = John Doe
When a browser requests a web page from a server, cookies belonging to the page is added to the request. This way the server gets the necessary data to "remember" information about users.
Function
function deleteCookie(cname) {
setCookie(name, '', 1);
document.cookie = name + '=; Expires=Thu, 01 Jan 1970 " +
"00:00:01 GMT; path=/;';
}
function getCookie(cname) {
var name = cname + "=";
var decodedCookie = decodeURIComponent(document.cookie);
var ca = decodedCookie.split(';');
for (var i = 0; i < ca.length; i++) {
var c = ca[i];
while (c.charAt(0) === ' ') {
c = c.substring(1);
}
if (c.indexOf(name) === 0) {
return c.substring(name.length, c.length);
}
}
return "";
}
function setCookie(cname, cvalue, exdays) {
var d = new Date();
d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
var expires = "expires=" + d.toUTCString();
document.cookie = cname + "=" + cvalue + "; " + expires +
"; path=/;";
}
Happy coding!