How can I implement custom code to run in all Ajax requests in Ext JS without having to manually insert it into each individual request?

When a user is logged in, ajax requests function properly. However, if the session becomes invalidated, the ajax returns a login screen and displays it as ajax content. I am wondering if it is feasible to incorporate custom code in Ext JS that would be executed with every ajax request to verify the validity of the session. If the session is invalid, JavaScript would redirect to the login page; otherwise, the Ajax request would proceed as usual.

Answer №1

Ext.ajax operates as a singleton, allowing you to establish a universal handler for any request errors that may occur.

To properly handle cases where the user lacks authorization, your server-side code must return an HTTP 403 status or something similar. Add the following snippet somewhere in your code (only once):

Ext.Ajax.on('requestexception', function(conn, response, options) {
    if (response.status == 403) {
       Ext.MessageBox.alert('Authentication', 'You are not logged in.');
       /* You can implement a login panel or other action here */
    }
};

If a session timeout causes an AJAX request to fail, you can elegantly manage it within your codebase.

The options parameter includes all of the AJAX request’s settings. By displaying a login interface and reauthenticating the user, you can automatically resubmit the original AJAX request they had initiated. This seamless process should not disrupt any other existing code that relies on AJAX requests.

Answer №2

It is crucial to verify the validity of the session on the server-side, rather than relying on JavaScript for this task.

Clients cannot be fully trusted in this regard.

Answer №3

Two ways to enhance your ajax process:

1. On the server side, validate the session when receiving a request. If the user is not logged in or the session has expired, return an HTTP 403 response (unauthorized). 2. On the client side, within your ajax response handler, check for error 403. If this error occurs, prompt the user to log in and send the login information to the server. Once the login is successful, resend the original request.

Implementing these steps may be straightforward if you are not heavily reliant on pre-built ajax libraries. However, if you are using such libraries, explore their capabilities.

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