One way to store and retrieve data on the client side is by using cookies. The cookie property is a member of the document object. You can store thousands of cookies per client. You can distinguish between cookies by several parameters:
name. The name of the cookie. A quoted string. Required. Example: "listSelectedIndex".
value. The value of the cookie. A numeric value or a quoted string. Required. Example: 5.
expires. Expiration date of the cookie. A date object. Optional. Defaults to the end of the current session. Example: now.
path. The path for which the cookie is valid. A quoted string. Optional. Example: "/foo/bar/html". Defaults to the path of the document or script that set the cookie.
domain. The domain for which the cookie is valid. A quoted string. Optional. Example: "www.internet.com". The default value of the domain attribute is the host name of the server that set the cookie.
secure. A Boolean value indicating whether the cookie transmission requires a secure protocol. Default to false.
To set up a date object to expire in one year, you need to multiply the following:
365 days in a year.
24 hours in a day.
60 minutes in an hour.
60 seconds in a minute.
1000 milliseconds in a second.
The following line of code computes the date object for the year-long cookie:
var now = new Date();
now.setTime(now.getTime() + 365 * 24 * 60 * 60 * 1000);
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