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copied!<p>There is no standard way of handling session timeouts in ExtJS. ExtJS is a client-side library, used to create the user interface/front-end layer of an application, while session management takes place on the server side.</p> <p>ExtJS Ajax requests implement a callback mechanism. It means that a certain Javascript function is assigned as the callback function, which is called when the Ajax request has finished (either successfully or unsuccessfully). Here's an example taken from <a href="http://dev.sencha.com/deploy/dev/docs/?class=Ext.Ajax" rel="nofollow">ExtJS API Documentation</a> - see parameters success and failure that define the callback functions:</p> <pre><code>// Basic request Ext.Ajax.request({ url: 'foo.php', success: someFn, failure: otherFn, headers: { 'my-header': 'foo' }, params: { foo: 'bar' } }); </code></pre> <p>So, in the case of session timeout, you could (for example) construct a JSON response, which would contain some error code (defined by you), and an error message to be shown to the user. The callback function should then check if this error is returned from the server, and take necessary actions (show error message, redirect to login page, etc.) when that happens.</p> <p>Note that in the above case, from ExtJS viewpoint, the Ajax request would actually be successful. When the HTTP request fails altogether (HTTP errors like 403 and such), the Ajax request is considered unsuccessful. This is important because it is usually possible to define different callback functions for successful and unsuccessful requests (as in the above sample code).</p>

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