I want to change the data that is processed in the checkout_onepage_saveBilling controller action.

I am using an observer with the predispatch event to catch the POST data which is coming from the address form in the checkout and manipulate the values.

How can I transfer this data to the controller action now?

This is my observer:

public function validateAddress($observer)

    $controller = $observer->getControllerAction();
    $action = $controller->getFullActionName();

    if ($action == "checkout_onepage_saveBilling") {
        $post = Mage::app()->getRequest()->getPost();
        $post[billing][postcode] = trim($post[billing][postcode]);
        $post[billing][city] = trim($post[billing][city]);

  • U need to use a plugin beforeExecute in this action Commented Jan 27, 2020 at 14:27
  • So I cannot use the predispatch event for that? How would I do that?
    – Chaz
    Commented Jan 27, 2020 at 14:32
  • Sorry for that in this case you can't use the plugin in Magento 1 you must override the controller. Commented Jan 27, 2020 at 14:39

1 Answer 1


Solved it like this now, using the setPost method of the request:

public function validateAddress($observer)
        /** @var Mage_Core_Controller_Request_Http $request */
        $request = $observer->getControllerAction()->getRequest();
        if (!$request->isPost() || !$request->isAjax()) {

        $action = $request->getActionName();
        if ($action == "saveBilling") {
            $this->_fixAddress($request, "billing");
        } elseif ($action == "saveShipping") {
            $this->_fixAddress($request, "shipping");

     * @param Mage_Core_Controller_Request_Http $request
     * @param string                            $type
    protected function _fixAddress($request, $type)
        $address             = $request->getPost($type, array());
        $address["postcode"] = trim(htmlspecialchars($address["postcode"]));
        $address["city"]     = trim(htmlspecialchars($address["city"]));
        $request->setPost($type, $address);

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