Magento 1.9.x : Newsletter Subscription Event

Question

Is there an event in Magento 1.9.x for Newsletter Subscription from the Profile page?

How do I find out when a user updates their newsletter subscription preference from this page?

I tried controller_action_predispatch_newsletter_manage_save and newsletter_subscriber_save_after events. Although not getting any subcriber data through either of the following:

$event = $observer->getEvent();
 $isSubscribed = $event->getRequest()->getParam('is_subscribed');

or

$subscriber = $observer->getEvent()->getSubscriber();
$data = $subscriber->getData();

Answer 1

Try listening to the model_save_after event with something like this (pseudocode):

public function checkSubscriptionPreference(Varien_Event_Observer $observer)
{
    $model = $observer->getObject();
    if (!$model instanceof Mage_Newsletter_Model_Subscriber) {
        return;
    }

    if ($model->isSubscribed()) {
        // your logic here
    }
}

There are other similar events that you could use depending on what you need, such as model_save_before, model_load_before, etc.