我正在尝试编写一个简单的扩展,利用\Magento\Framework\Message\ManagerInterface
在所有页面上添加自定义成功消息。我已经建立了这个观察者:
<?php
namespace Revolution\MessageCentre\Observer;
use Magento\Framework\Event\ObserverInterface;
class ControllerActionPredispathObserver implements ObserverInterface
{
/**
* @var \Magento\Framework\App\RequestInterface
*/
protected $request;
/**
* @var \Magento\Framework\Message\ManagerInterface
*/
protected $messageManager;
/**
* @param \Magento\Framework\App\RequestInterface $request
* @param \Magento\Framework\Message\ManagerInterface $messageManager
*/
public function __construct(
\Magento\Framework\App\RequestInterface $request,
\Magento\Framework\Message\ManagerInterface $messageManager
) {
$this->request = $request;
$this->messageManager = $messageManager;
}
/**
* Pre-dispatch frontend controller action
*
* @param \Magento\Framework\Event\Observer $observer
* @return void
*/
public function execute(\Magento\Framework\Event\Observer $observer)
{
$requestParams = $this->request->getParams();
$this->messageManager->addSuccessMessage(__('This is a success message'));
}
}
观察者监听前端控制器动作预调度。这是etc/frontend/events.xml
:
<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
<event name="controller_action_predispatch">
<observer name="revolution_messagecentre_controller_action_predispatch" instance="MyNamespace\MessageCentre\Observer\ControllerActionPredispathObserver" shared="false" />
</event>
</config>
它工作正常,因为它在页面上添加了成功消息/checkout/cart/
,但它只出现在此页面上。我可以在 Chrome 的网络面板和源代码中看到magento/module-theme/view/frontend/templates/messages.phtml
出现在产品页面之类的页面上,但它是空的,这里没有消息。为什么?我已经对所有缓存进行了全面核对,再次尝试禁用浏览器缓存但仍然没有消息。是什么触发了消息的实际呈现,为什么除了购物车之外的所有页面都缺少这个?提前致谢!