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AJAX Tutorial: Saving Session Across Page Loads Without Cookies, On The Client Side
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08/25/2005, By Brad Neuberg
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This is a mini-tutorial on saving state across page loads on the client side, without using cookies so as to save large amounts of data beyond cookies size limits.
In AJAX, most of the action occurs inside a single web page. When a page is loaded, a new instance of the JavaScript interpreter is started. When you leave a page, jumping to Google for example, all of your JavaScript objects are completely cleared away; you lose all of your state. If you then hit the back button to go back from Google to your original AJAX application, you will find that the page actually completely reloads, calling your onload listener, and that any JavaScript objects you stored anywhere are gone.
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