Magento stop order if cart quantity is more than

Question

all, i need to solve this situation:

If my magento cart total quantity products is more than 5, then i need to stop the order process and activate something like "call for price", cause if you order more than 5 products i need to find the real shipment costs that magento can't do.. There is something i can do for this?

I have found something like this http://www.magentocommerce.com/boards/viewthread/47362/ Can i implement that?

Some modules?

Thanks.

Answer 1

I'd recommend using the event/observer system in Magento. Inchoo has a post on how to use this to limit orders over a certain cost.

http://inchoo.net/ecommerce/magento/magento-maximum-allowed-order-amount/

You could do something very similar but check for the number of items in the basket instead.

Answer 2

You need to use Magento event/observer pattern. In your case you can use sales_order_place_before