Magento 1 – Call Action After Save Config Clicked in Admin

configurationcontrollersevent-observermodule

How can I call an action of my controller in a custom module after "Save Config" was clicked in System –> Configuration –> Catalog? (image)

Settings of my module are inside that section, and I need to fire my action just after configuration was saved. I need to call the action only in that section of the admin panel – if "Save Config" was clicked in a different section of the admin, the action don't need to be called.

EDIT:

Action has to check if saved settings of the module are correct, and do some other calculations every time the configuration is saved.

EDIT 2:

I tried solution posted by Fabian Blechschmidt. Observer is working after "Save Config" was clicked (I see text in log file):

config.xml:

<config>
...
    <global>
        <events>
            <admin_system_config_changed_section_mysection>
                <observers>
                    <mymodule>
                        <type>singleton</type>
                        <class>mymodule/observer</class>
                        <method>handle_adminSystemConfigChangedSection</method>
                    </mymodule>
                </observers>
            </admin_system_config_changed_section_mysection>
        </events>
    </global>
...
</config>

Model/Observer.php:

class My_Module_Model_Observer
{
    public function handle_adminSystemConfigChangedSection()
    {
        Mage::log('Test: oberver is working!');

        //I tried this but it doesn't actually trigger the action:
        $url = Mage::getUrl('myrouter/adminhtml_test/validate');
        Mage::app()->getResponse()->setRedirect($url);
    }
}

But now I'm stuck.

I don't know how to trigger action method inside that observer. Controller looks like this and it works fine:

config.xml:

<admin>
    <routers>
        <mymodule>
            <use>admin</use>
            <args>
                <module>My_Module</module>
                <frontName>myrouter</frontName>
            </args>
        </mymodule>
    </routers>
</admin>

controllers/Adminhtml/TestController.php:

class My_Module_Adminhtml_TestController extends Mage_Adminhtml_Controller_Action
{   
    public function validateAction()
    {
        //validate config settings here
    }
}

EDIT 3:

Event-observer solution works fine, so I created separate question about redirecting to actions:
Redirect to module/controller/action

Best Answer

What exactly is your problem? Your path:

Register an observer, listen to admin_system_config_changed_section_{$section}, /app/code/core/Mage/Adminhtml/controllers/System/ConfigController.php:177
do whatever you want

Related Solutions

Magento – Redirect to Module/Controller/Action

Again, what are you trying to do? Redirecting someone from sysconfig to your controller is odd UX at best, even if you redirect back to sysconfig after your code executes. If that's all you're doing, you should be consuming the POST and letting sysconfig behave as normal.

The reason your (first) redirect isn't working is that after this event fires, execution flows back to the controller action, which then sets its own redirect per usual:

class Mage_Adminhtml_System_ConfigController extends Mage_Adminhtml_Controller_Action
{
    public function saveAction()
    {
        // snip ...
        try {
            // snip ...
            Mage::dispatchEvent("admin_system_config_changed_section_{$section}",
                array('website' => $website, 'store' => $store)
            );
            // snip ...            }
        catch (Mage_Core_Exception $e) {
            // snip ...
        }
        catch (Exception $e) {
            // snip ...
        }
            // snip ...

        $this->_redirect('*/*/edit', array('_current' => array('section', 'website', 'store')));
    }

You can get around this in a couple ways:

(not ideal) Flush the response after setting the redirect in your browser; while this obeys your current intent, know that you are preventing subsequent native code from executing both in the action and in postDispatch().
(better, but still pretty ugly) Instantiate your observer as a singleton, set a flag, and then set that observer class to also consume the controller_action_postdispatch_adminhtml_system_config_save event using a different method which will set your redirect.

E.g.

public function checkShouldRedirect()
{
    $response = Mage::app()->getResponse();

    //use 'mysection' to check we are in correct section
    if (self::$flag==true && $this->getRequest()->getParam('section') == 'mysection') {
        $response->setRedirect(
            Mage::helper('adminhtml')->getUrl('myrouter/adminhtml_test/validate')
        );
        //below is only necessary for option 1
        //$response->sendResponse();
    }
}

If you are going to engage in the second option - and provided that you aren't opposed to the action saving the open panel state - you might as well just set your observer to consume only the postdispatch event, since you can test that you are saving your section by testing the section param.

Magento – dynamically adding layout updates xml files

To add a layout file:

Mage::app()->getLayout()->loadFile($file);

To add a handle:

Mage::app()->getLayout()->getUpdate()->addHandle('your_handle_name');

To change settings in the config:

Mage::getConfig()->setNode(
    'global/helpers/core/encryption_model',
    'Ikonoshirt_Pbkdf2_Model_Stub_EE'
);