停止从 Magento 中的事件观察者结账的正确方法是

问题描述

我正在事件 checkout_controller_onepage_save_shipping_method 期间验证运输报价，如果验证失败，我想将用户发送回运输方式选择，但我还想显示一条消息，说明失败的原因.Magento 有内置的方法吗?

I am verifying shipping quotes during the event checkout_controller_onepage_save_shipping_method and if the verification fails i want to send the user back to shipping method selection but I would also like to display a message saying why it failed. Does Magento have a way of doing this built in?

我已经在验证数据，只是缺少重定向到运输方式和显示消息的方式.

I am already verifying the data I just lack the redirect to shipping methods and way to display a message.

推荐答案

Alan Storm 的回答一如既往地内容丰富且具有启发性.但是在这种情况下，单页结帐主要是 AJAX，它会忽略会话错误消息，直到离开结帐页面才能看到它.

Alan Storm's answer is, as ever, informative and enlightening. But in this situation the onepage checkout is mostly AJAX which ignores the session error message, you won't see it until leaving the checkout page.

在 saveShippingMethodAction 中有如下一行:

$result = $this->getOnepage()->saveShippingMethod($data);

...然后 $result 是 JSON 编码的.如果您覆盖 Mage_Checkout_Model_Type_Onepage::saveShippingMethod 以执行检查，然后控制返回的内容，您可以插入一条错误消息，该消息将返回到浏览器并在弹出窗口中显示给用户.

...and then $result is JSON encoded. If you override Mage_Checkout_Model_Type_Onepage::saveShippingMethod to perform your check then control what is returned you can insert an error message that will be returned to the browser and shown to the user in a popup.

您的覆盖可能如下所示:

Your override might look something like this:

public function saveShippingMethod($shippingMethod)
{
    if ($this->doesntApplyHere()) {
        return array('error' => -1, 'message' => $this->_helper->__('Explain the problem here.'));
    }
    return parent::saveShippingMethod($shippingMethod);
}

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