Magento – Check Some Condition Before Product added to cart

addtocartcartevent-observermagento-1.9

I want to add product to cart. So when i click on the add to cart button i will be checking some condition like some variable is set or not. If it is set, product will be added to cart. If not set, the product should not be added to cart.

for this i was using observer called controller_action_predispatch_checkout_cart_add

I can wrote a condition to check variable is set or not.if it is not set i want to come out of the observer. I mean product should not added to cart.

Please Help Me.

Thanks In Advance

Best Answer

The closest events I could find that would work that are lower than the dispatch event are

catalog_product_type_prepare_full_options
catalog_product_type_prepare_lite_options

You can have an event listener on one of those events that does your logic check and throws an exception if it fails.

That being said, Magento itself actually uses the following event

checkout_cart_product_add_after

Then, in the listener is uses code like this

$quoteItem = $observer->getEvent()->getQuoteItem();
$product = $observer->getEvent()->getProduct();
// Your checks here, return if you want to leave things alone
$quoteItem->getQuote()->removeItem($quoteItem->getId());
Mage::throwException('This is the message to the customer');

Related Solutions

Magento 1 – Add Custom Option and Price to Product in Cart Using Observer

@Tim gave a talk about this issue on the weekend: https://docs.google.com/presentation/d/1efPznQSVTrT1HAD1xQvCPC-Tgvr8jYok4X7ZEJhm9jE/edit

What you want is Method 2: Add Following Event in Config.xml

<sales_quote_collect_totals_before>
<observers>
<hackathon_presentation>
<type>singleton</type>
<class>modulename/observer</class>
<method>salesQuoteAddressCollectTotalsBefore</method>
</hackathon_presentation>
</observers>
</sales_quote_collect_totals_before>

In Observer.php add following Method

   public function salesQuoteAddressCollectTotalsBefore($observer)
    {
        $quote = $observer->getQuote();
        $quote_items = $quote->getItemsCollection();
        foreach ($quote_items as $item) {
            $additionalOptions = array(
                array(
                    'code'  => 'my_code',
                    'label' => 'This text is displayed through additional options',
                    'value' => 'ID is ' . $item->getProductId() . ' and SKU is ' . $item->getSku()
                )
            );
            $item->addOption(
                array(
                     'code'  => 'additional_options',
                     'value' => serialize($additionalOptions),
                )
            );
        }
    }

Here is more about this topic:

https://stackoverflow.com/questions/9334115/magento-change-custom-option-value-before-adding-it-to-cart/9344336#9344336

and more:

https://stackoverflow.com/questions/9412074/magento-quote-order-product-item-attribute-based-on-user-input/9496266#9496266

Magento – Add Qty to Product before adding to cart

You could use the sales_quote_product_add_after event. You can access there the added quote items and change the quantity. Just be careful not to change the quantity for items that have a parent set (you can check if $item->getParentItem() is set).

Best Answer

Related Solutions

Magento 1 – Add Custom Option and Price to Product in Cart Using Observer

Magento – Add Qty to Product before adding to cart

Related Topic