我正在尝试访问 View 助手中的服务定位器,以便我可以访问我的配置。我将这个 View 助手用于递归函数,所以我不知道在哪里声明服务定位器。
namespace Application\View\Helper;
use Zend\View\Helper\AbstractHelper;
use CatMgt\Model\CategoryTable as RecursiveTable;
class CategoryRecursiveViewHelper extends AbstractHelper
{
protected $table;
public function __construct(RecursiveTable $rec)
{
$this->table = $rec;
}
public function __invoke($project_id, $id, $user_themes_forbidden, $level, $d, $role_level)
{
$config = $serviceLocator->getServiceLocator()->get('config');
//So i can access $config['templates']
$this->__invoke($val->project_id, $id, $user_themes_forbidden, $level, $d, $role_level);
}
}
我尝试了此处提供的解决方案 link
但是没有用,这样可以吗?
namespace Application\View\Helper;
use Zend\View\Helper\AbstractHelper;
use CatMgt\Model\CategoryTable as RecursiveTable;
use Zend\View\HelperPluginManager as ServiceManager;
class CategoryRecursiveViewHelper extends AbstractHelper
{
protected $table;
protected $serviceManager;
public function __construct(RecursiveTable $rec, ServiceManager $serviceManager)
{
$this->table = $rec;
$this->serviceManager = $serviceManager;
}
public function __invoke($project_id, $id, $user_themes_forbidden, $level, $d, $role_level)
{
$config = $this->serviceManager->getServiceLocator()->get('config');
//So i can access $config['templates']
$this->__invoke($val->project_id, $id, $user_themes_forbidden, $level, $d, $role_level);
}
}
最佳答案
首先,您的 ViewHelper
是一个无限循环,您的应用程序会像那样崩溃。您在 __invoke
中调用 __invoke
- 这是行不通的。
使用依赖项注册 ViewHelper
首先,您要像这样编写 ViewHelper
:
class FooBarHelper extends AbstractHelper
{
protected $foo;
protected $bar;
public function __construct(Foo $foo, Bar $bar)
{
$this->foo = $foo;
$this->bar = $bar;
}
public function __invoke($args)
{
return $this->foo(
$this->bar($args['something'])
);
}
}
接下来是注册 ViewHelper
。由于它需要依赖项,因此您需要使用 factory 作为目标。
// module.config.php
'view_helpers' => [
'factories' => [
'foobar' => 'My\Something\FooBarHelperFactory'
]
]
目标现在是我们尚未编写的工厂类。所以继续:
class FooBarHelperFactory implements FactoryInterface
{
public function createService(ServiceLocatorInterface $sl)
{
// $sl is instanceof ViewHelperManager, we need the real SL though
$rsl = $sl->getServiceLocator();
$foo = $rsl->get('foo');
$bar = $rsl->get('bar');
return new FooBarHelper($foo, $bar);
}
}
现在您可以在任何 View 文件中通过 $this->foobar($args)
使用您的 ViewHelper
。
永远不要将 ServiceLocator 作为依赖项使用
每当您依赖 ServiceManager
作为依赖项时,您就会陷入糟糕的设计。您的类将具有未知类型的依赖项,并且它们是隐藏的。每当您的类需要一些外部数据时,直接通过 __construct()
使其可用,并且不要通过注入(inject) ServiceManager
来隐藏依赖项。
关于php - Zend 框架 2 : Service locator in view helper,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23531462/