将产品添加到购物车时更新小计 [英] updating subtotal when products added to cart

问题描述

我目前正以编程方式将产品添加到购物车，以在我的网站上创建免费样品"外观.

I am currently adding products programatically to the cart, to create a 'free sample' aspect to my site.

当前，所有这些产品的价格均为0美元，最多可以添加15个.购物车中有5个免费样品"产品后，我需要在小计中添加20美元.

Currently, all of these products are $0 and you can add a maximum of 15. Once you have 5 'free sample' products in the cart, I need to add $20 to the subtotal.

我知道我可以使用以下方法获得总计:

I know I can get the grandtotal using:

Mage::getSingleton('checkout/cart')->getQuote()->getGrandTotal();

但是我如何访问小计并向其中添加20美元呢?

But how do I access the subtotal and also add $20 to it?

我猜我需要写一个观察者，因为我需要检查何时从购物车中添加/删除产品，以便添加或不添加 20 美元.

I'm guessing I'll need to write an observer, as I'll need to check when products are added/removed from the cart in order to either add the $20 or not.

有人做过此事吗?或者可以为我指出正确的方向?

Has anyone done this before or could point me in the right direction of how I could do this?

非常感谢

谢谢

推荐答案

我最近实际上回答了这个问题，这里是需要做什么的基本想法，如果您需要更具体的细节，请告诉我:添加一个查找此事件"sales_quote_add_item"的观察者:

I actually answered this question recently here is a basic idea of what needs to be done, let me know if you need more specific details: 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>

观察者应具有执行以下操作的方法:

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

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

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