Changing the price in quote while adding product to cart: magento

Question

I want to change the product price while add that product to cart.

How its possible let me know...

Answer 1

The way to do it is add an observer which looks for this event 'sales_quote_add_item':

<events>
    <sales_quote_add_item>
        <observers>
            <priceupdate_observer>
                <type>singleton</type>
                <class>mymodule/observer</class>
                <method>updatePrice</method>
            </priceupdate_observer>
        </observers>
    </sales_quote_add_item>
</events>

The observer should have a method which does something like this:

public function updatePrice($observer) {
    $event = $observer->getEvent();
    $quote_item = $event->getQuoteItem();
    $new_price = <insert logic>
    $quote_item->setOriginalCustomPrice($new_price);
    $quote_item->save();
}

Answer 2

You can use an observer class to listen to checkout_cart_product_add_after, and use a product’s “Super Mode” to set custom prices against the quote item.

In your /app/code/local/{namespace}/{yourmodule}/etc/config.xml:

<config>
    ...
    <frontend>
        ...
        <events>
            <checkout_cart_product_add_after>
                <observers>
                    <unique_event_name>
                        <class>{{modulename}}/observer</class>
                        <method>modifyPrice</method>
                    </unique_event_name>
                </observers>
            </checkout_cart_product_add_after>
        </events>
        ...
    </frontend>
    ...
</config>

And then create an Observer class at /app/code/local/{namespace}/{yourmodule}/Model/Observer.php

    <?php
        class <namespace>_<modulename>_Model_Observer
        {
            public function modifyPrice(Varien_Event_Observer $obs)
            {
                $customPrice = Mage::getSingleton(’core/session’)->getCustomPriceCalcuation(); // Provide you price i have set with session
                $p = $obs->getQuoteItem();
                $p->setCustomPrice($customPrice)->setOriginalCustomPrice($customPrice); 
            }

        }