| 4.4.1.JavaScript and Cookies |
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A cookie is a small bit of information stored in a text file on the user's computer by a browser. |
The cookie object is part of the Document object. |
Cookies can be created, set, and modified by setting the appropriate values of the cookie property. |
A cookie has four name attributes: expires, path, domain, and secure. |
By default, a cookie lasts only during the current browsing session. |
For a cookie to last beyond the current browsing session, the expires attribute must be set. |
The value of expires attribute can be set to any valid date string. |
The path attribute specifies the domain associated with the cookie. |
The level of association begins at the specified path and goes down into any subfolders. |
So for example, suppose http://www.java2s.com/examples/cookie.html was setting a cookie and wanted the cookie to be shared across Web pages on the java2s.com domain. |
To do this, the cookie path attribute needs to be set to "/". |
This allows the cookie to be accessed from any page on the www.java2s.com Web server. |
If the path was set to "/examples", the cookie would only be valid to pages in the examples folder and its subfolders. |
If the secure attribute is specified, the cookie will be only be transmitted over a secure channel (HTTPS). |
If secure is not specified, the cookie can be transmitted over any communications channel. |