Magento Events 'catalog_product_get_final_price' not working?

Question

below is my config.xml file code.

<?xml version="1.0"?>
<config>
    <modules>
        <Eventprice_Meta>
            <version>0.0.1</version>
        </Eventprice_Meta>
    </modules>
    <global>
        <models>
            <eventprice_meta>
                <class>Eventprice_Meta_Model_Observer</class>
            </eventprice_meta>
        </models>
    </global>
    <adminhtml>
        <events>
            <catalog_product_get_final_price><!-- observe the event -->
                <observers>
                    <eventprice_meta>
                        <type>singleton</type>
                        <class>Eventprice_Meta_Model_Observer</class>
                        <method>changeprice</method>
                    </eventprice_meta>
                </observers>
            </catalog_product_get_final_price>
        </events>
    </adminhtml>
</config>

below is my Observer.php files code.

<?php 
class Eventprice_Meta_Model_Observer {

    public function changeprice(Varien_Event_Observer $event) {
        return 5;
        if($_GET['id']){
            $pricetoadd=Mage::getModel('catalog/product')
                        ->load($_GET['id'])->getPrice();

            $product = $event->getEvent()->getProduct();
            $originalprice = $product->getPrice();
            $customprice = $originalprice+$pricetoadd;
            $product->setPrice($customprice);
        }
        echo 'call';
        exit;
   }
}

i want to set the Product price $5 on product view page. i write a function 'changeprice' for changing the product price. but this function is not call please checked where i create a mistake in code.

Answer 1

You declared your observer in the <adminhtml> area. So it does not get triggered on frontend.
You need to replace

<adminhtml>
    <events>
    ....

with

<frontend>
    <events>
    ....

Next problem. return 5; will not make the price of the product 5. It will do nothing.
You need to make it $observer->getProduct()->setFinalPrice(...your price here...)

Next one. Don't use $_GET['id']. Use Mage::app()->getRequest()->getParam('id')

And the last one for now. calling return 5 at the top of the method will not execute the rest of the method. So you never reach echo 'call'; exit;

Answer 2

Observer parameters issue:

There are issue with parameters on observer. For getting the product id try with $observer->getProduct()->Id(); As system when catalog_product_get_final_price event fire then the two parameter has been sended.

• Current product Object: $event->getEvent()->getProduct();
• Other Qty: $event->getEvent()->getQty().

No need load product object again.

Mage::dispatchEvent('catalog_product_get_final_price', array('product' => $product, 'qty' => $qty));

As @Marius told for set the final price,you need to use $event->getEvent()->getProduct()->setFinalPrice() for set final price and set event area are from adminhtml to frontend for properly works.