Magento adminhtml AJAX query returns 302 status

magento, magento-1.7

Solution

The Url should be `http://mystore.com/index.php/admin/mybackend/ajax/key/.../?isAjax=true`, so magento knows this is an ajax request.

Also you need to provide a from_key in your POST data which is stored in the global JavaScript Variable `window.FORM_KEY`.

Your jQuery Request should look something like this:

function magentoAdminAjax(data, callback) {
    data.form_key = window.FORM_KEY;
    $.post(
        'http://mystore.com/index.php/admin/mybackend/ajax/key/.../?isAjax=true',
        data,
        callback
    );
}

The Code for this check can be found in Mage_Adminhtml_Controller_Action::preDispatch(Line: 164) (magento-1.7.0.2)

Problem

I am currently developing a Magento extension whose main components are a frontend widget and a backend admin options panel. I have no frontend controller, but I have an `adminhtml` controller that is giving me some trouble. Here is some of the code in my controller. File: /app/code/community/Mynamespace/Myextension/controllers/Adminhtml/MybackendController.php ``` class Mynamespace_Myextension_Adminhtml_MybackendController extends Mage_adminhtml_Controller_Action { protected function normalAction() { } protected function ajaxAction() { die('got here'); } } ``` `normalAction` is an action that is called by navigating through links such as `http://mystore.com/index.php/admin/mybackend/normal/key/.../` . There are a few actions like this such as `index`, `save`, `edit`, `grid`, etc. The entry point to my controller is a menu entry that leads to the `index` action. All such actions work as expected. `ajaxAction` is an action that is called only through an AJAX POST query. The problem is that whenever I attempt to do this, I get a 302 HTTP status code reply that redirects to the admin dashboard (`admin/index/index`). If I try to access this action directly by typing its link in the browser, I still get a 302. If I add a menu entry to this action, then it works as expected and I see the "got here" text. The Javascript/jQuery code that does the AJAX request is not complex: ``` $.post( 'http://mystore.com/index.php/admin/mybackend/ajax/key/.../', somePostDataObject, function() { alert( 'success' ); } ); ``` Note that the success function gets called even though the status code is 302. I tried debugging the routing mechanism to understand exactly what causes it to redirect. So far I have deduced that a problem occurs in the `preDispatch` method of the `Mage_Core_Controller_Varien_Action` class. The module, controller and action are successfully resolved and the request is marked as dispatched (`_dispatched` property is true) until the `controller_action_predispatch` event is dispatched. After the event is resolved, the request appears as not being dispatched (`_dispatched` becomes false). Presumably one of the objects that listen for this event does some further processing on the request and rejects it. I have not been able to debug any deeper than this. Normally I would post some code to help you understand what's going on even better, but there are quite a lot of lines to copy from the various configuration files and classes, so I will do that as people write comments or answers asking to see specific files. So far, I believe the configuration is correct, as all the other functionality besides the AJAX request is working ok.

Original source